Unstable Rpm Idle Motorcycle

After a while idling, it backfired and the idle started to wander. · OEM-style connector cables are required and sold. Would help to know how high the RPM was, but you have no tach. A lower idle speed can cause hard starting; poor throttle response erratic idle and unnecessary engine wear. Idle will drop 200-300 rpm, then return to its normal idle speed of 1350+-. Adjust Idle Mixture Screw and Idle Speed Screw as required. I lost sight of her so I pulled over. This is a project bike that has sat for an unknown amout of time. To ensure proper charging at idle, maintain an idle. Hot idle, with lights ON is at 750rpm(almost 800). Idle Air Control Circuit Low. consumed more fuel at idle than the diesel medium heavy truck category at 23,000-33,000 lbs. When i start the car, the idle rpm in park and/or neutral is high. was great-----Engine fired first time and ran at 700 rpm until warm. by Kyle McFadden. A tachometer is a device used to provide live measurement of an engine's RPM value. If this is the case you will need to modify the program to account for that. 5k - 2k pero after running 10kms tapos huminto ako para pumasok sa gate ng bahay namin maya maya aakyat na ng 3k rpm tapos hindi na bababa. I agree, the type of bike makes a huge difference. Sometimes, the throttle position may not show zero at idle and should be correctly adjusted with the bike at full operating temperature to make sure it is reading zero. At troll speed of 1,200-RPM on both engines the port engine [tachometer reading] will jump to as much as 3,000-RPM for an hour or so. PLEASE READ BELOW! Use the filter to make it easier to find the bike you want. Now engine has erratic idle. 99 Porsche boxster unstable idle! revs up constantly maf related? Its my daily driver and i need it fixed asap. Erratic Idle During Cold Start And Slow Idleneed Feedback. 5 Progression system 3. Set the idle mixture screw halfway between the positions, or at the strongest idle. This separate valve is controlled by the computer. I must release the clutch a little bit to slow the engine back to 1200 - 1400. I have been experiencing some annoying rough/erratic idles on cold engine starts. So far, engine and ECM seem to be working wonderfully. Some carburetors have a slow speed fuel adjusting screw that regulates the fuel/air mixture in the lower rpm range. If this sensor is out of adjustment or is failing, the result could be stalling, idle surge, flat throttle response, hesitation, or erratic engine operation. Does anyone know how to adjust it?. All we can set is the idle RPM. Do you drive around where the roads are dusty & dirty? You might have to clean the induction assembly too. Erratic rough hunting fluctuating idle vacuum leak. i have been told that this all leads to the idle control valve (ICV) but thought i would ask. Usually adjusting the TPS, idle bypass valve, mixture and ignition will cure an unstable idle. It balances between 900 and 1000 rpm. On colder mornings, the bike must be choked, but after a short period of time of running choked, the idle climbs up to about 3500. 7, when you start it when its cold, the idle fluctuates between 1000 and 1600 RPM for a couple of minutes before going to normal. When you start it races at 2. i just had a small intake leak but. The engine itself has the most delay from air fuel volume changes to resulting RPM changes. I've got a 2000 D with the 4. When I'm accelerating and get to required speed my RPM gauge either drops and steadies or jumps up then steadies back. After a ride of around 30km assume that I stopped at the lights gear is set to 1st and clutch is pulled. Engine AFR Idle Tune This document will walk you through the process of properly tuning your idle to the RPM’s you choose. How to Change the Oil on Your Twin Cam Motorcycle "A new type of motorcycle repair manual. So here's the deal: I have a 1986 Fiero GT (155,000 miles, stock 2. Anyone had the same issue on the past ? Any ideas what can be causing this ? The car runs perfectly, no excessive smoke, pulls like a beast. The bike's idle speed is not erratic, I'd say, with a regular and small 200-500 rpm up/down on the tach at around 1,500 rpm. The solution is to alter the behaviour of the idle speed components so the system is stable again. My car is running extremely rich and has a terribly rough idle with extreme hesitation when applying throttle. Below is a diagram with general pictures of some of the parts in a typical carburetor that affect jetting. Ive got a zafira 1. I have cleaned the carb well so next suspected the linkage that takes a tight bend just after leaving the carb but then I read a comment that Boyer ignition would stop the erratic idle in Nortons. You can use the idle adjustment knob to increase the idle when the bike is cold and then decrease the idle when the bike is warm. 510 lift), and GMR ported heads, so the idle is not real rough anyway. Coincident?? The high idle is around 1800-2000 rpm. On the way home her Harley started to misfire and run poorly. 2004 Zx6R Some times at idle the motor seems like it boggs down and other times it idles fine. For many single-cylinder motorcycle engines, idle speed is set between 1200 and 1500 rpm. Below are the four most common. After a ride of around 30km assume that I stopped at the lights gear is set to 1st and clutch is pulled. If your tach is reasonably accurate, use it. Also if the transition from high to low is smooth and slow there is no problem. A higher idle RPM can reduce stalling and the sensation of closed throttle compression braking. Maybe the throtle actuator malfunctions or is dirty on the inside so it doesnt fully close to perform a good idle rpm. 7L engine and 4wd and began noticing erratic engine idling after stopping temporarily and putting the transmission in "Park". Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. I tried to adjust it now idle is 2000 but if i set it to less than 2000. madumi na nga din ang TB. It idles at 3500 RPM when warmed up. Check engine light is ON. When logging you will see this as a jagged spark advance chart, most noticeable with cams at lower idle RPM’s where the spark advance generally oscillates between its min/max allowed values as the engine lopes at idle. Any ideas on the possible cause. If the code comes back you may have to replace the Electric Throttle Control Actuator (Motor) to repair the problem. When I was leaving, the bikewas idleing a little high, 1150 RPM. And since a thing this big usually isn’t going to exceed 6000 rpm, overhead cams just aren’t necessary. In ANY engine,it will have an "idle" speed or rpm. Unstable/ pulsing RPM at idle (2013 1. Be sure your AA policy includes motorcycle assistance. How do adjust since there is no high speed idle screw? See bottom pic. Most recently, that bike is Triumph's rippling Rocket III. The RPM would not stay stable. Hi, i have a 1999 yamaha yzf r6 and after about 30-45min of riding it stalls when ever i slow down too fast or when i am stopped at a light. So you want to synchronize the carbs on your multi-carbed motorcycle? There are a couple of methods you can use: the vacuum gauge method (generally how it's done in a motorcycle shop) and the. Unfortunately, these variables are all inter-related. If the idle jolts subside then the problem is the vanos. I have limited experience with carburated engines, so please bear with me. I have a Kohler Command 7000 KT725(2017) and need to check it's high speed at 3600 rpm. Highlight the zero percent column from 2,000 rpm to redline and enter in values from -40 to -50. 2003 altima 2. Nothing outragous but just one time it will barely be idling high enoug to keep running and then the next time I ride will be idling a bit high. If I look at tachometer, RPM goes down from high to low, and it was unstable around 700rpm by going back and forth during idling. If I add more power to engine, it's running ok and also there are no fluctations when I drive car OR even there are no noticable fluctations when car have more than 1200 RPM. I rode the bike home and was going to look into it. On Petrol 1. A tachometer is a device used to provide live measurement of an engine's RPM value. Like a high pulse is bad for the heart, a high RPM rate is not good for the car engine. 050" lift, 114 LSA) with valve springs to match. If you notice stumbling or sputtering, it can indicate a rich condition. Valves in tolerance (just) last time I checked. If the engine back fires or breaks up in the carb, increase the Main Jet size. Engine/exhaust sound like a tractor during these first seconds and engine seems to stall almost. Many people have removed and cleaned them but, this is normally a temporary fix and the valve should be replaced. No check engine light, but the computer did show the infamous code 32. Still idles - Answered by a verified Motorcycle Mechanic. Idle Circuit Notes:. Rev engine 2-3000 rpms 2 or 3 times under no-load, then run engine at idle speed. Probably the most common problem that causes idle problems in multiport fuel injected engines is a carboned-up throttle body. Additionally, over the course of about an hour, the idle RPM will increase to around 3. - doug - >I've got an '87 Honda CRX Si with fuel injection. hey guys i have an 08 r1 with an akrapovic y-pipe(cat eliminator), bmc air filter, and racing baffles (which essentially just replaces the baffles in the. It is a V6 4WD Automatic. Sometimes when it has been stopped for about 20 minutes and then restarted the idle rpm goes up to 3500 and then slowly –slowly to the normal figure 1500rpm. Adjusting the idle mixture screw does NOT change the mixture of the carburetor! Please read on. it idles down and lugs. near 1,000 rpm, adjust the pilot screw in one-half turn at a time until the idle either slows or becomes irregular. First I will show you a video of such a rough idle and then list the possible problems that may cause that. It may also develop an air leak and allow unmetered air into the manifold, causing an erratic idle and a sucking sound. 6 2004 petrol. 7 idles erratic jumps 4-500 rpm rpm change at idle and while driving on highway replaced pvc idle control. When you are riding and the popping occurs, pull in the clutch and let the engine revs drop to idle; When you play back the data, look for the idle spot at speed. RPMs are jumping between 400 and 1000 until the needle settles at 800 after 30-40sec (see video). This is consistent, >occuring about every 2 seconds. No engine fires every cylinder 100% of the time. I am fairly new to Nortons and have a '73 Interstate with a single 34mm Makuni. Battery and coil ignition shouldn't be stressed at idle speed at all. Sometimes, the throttle position may not show zero at idle and should be correctly adjusted with the bike at full operating temperature to make sure it is reading zero. Manufactures have removed these. The bike runs great but it has an erratic idle. The simple in design little Stromberg NA-S3 carburetor is difficult to make operate properly because it is so poorly understood. For example, if the idle specification is 650 rpm, then the goal may be between 590 rpm and 620 rpm. The dazzling example featured here, chassis GT40P/1074, earns bonus points for at least three reasons. The normal idle is around 1200 - 1400 RPM. 2002 Ford Focus Idle problem SPI ENGINE. i own a 1971 honda cl350 k3 scrambler. Can very slightly feel it seat of the pants. I don't have a tachometer on the Sportster but the 2000 RPM high idle seems about right. 7 idles erratic jumps 4-500 rpm rpm change at idle and while driving on highway replaced pvc idle control. A lot of the items even apply to fuel injected systems. it idles down and lugs. My idle is erratic over a range of about 600 or 700 rpm. sometimes i stop without it stalling and the idle, which i have set to 1500 rpms, starts to drop in bursts, about 300 rpms per burst until it stalls. It will be a year ago in March that I put my JDM B16 SIR II into my del sol. You want the slowest idle where the engine runs smoothly and has a nice transition off-idle to the needle. Reduce idle speed slightly (850 - 950 rpm usually works). Re: Erratic Idle and Backfire - 1980 CB650 Post by Volker_P » Fri Oct 12, 2012 7:14 am Basically the cylinders with air leak may not run all the time or started later (e. 119K miles. 5it just goes up and down by itself. CARBURETOR ADJUSTMENT PROCEDURE Idle Adjustment Procedure. Be sure your AA policy includes motorcycle assistance. I installed a Holley Sniper on my Ford Maverick 302 V8. The CV carb is dependent upon vacuum to function properly. Pay attention to low idle or stalling. Note: Engine designs are subject to change. In addition, if the fuel level in the float chamber is set too low, insufficient fuel will be drawn through the main jet. when you do stab the gas, it will sit at the RPM you sent it to and slowly come back down and usualy it will settel at about normal idling speed or just slowly go to 0. He mentioned that it was more than likely an intake leak. It now runs great, except for when I am running WOT, when it reaches about 9k rpm, it starts to hesitate, or bog, a little. When cold it varrys between 2 and 3K RPM. Now, adjust the screw about half way between the two positions, and you will often hear a very slight increase in engine RPM. At this time, RPM went down to zero. Engine tends to shutdown whenever i remove me foot from the accelerator 6. Naka SWR 28mm carb po aq pero taas baba po ang minor hindi ko makuha ang tamang tono pa help naman po mga sir salamat. >"but upon acceleration at high rpm it misfires. when i turn the engine over the engine idles high, at above 2k rpms. Maybe the throtle actuator malfunctions or is dirty on the inside so it doesnt fully close to perform a good idle rpm. Start back up, no engine light, same thing happensengine light comes on and it dies. If the car experiences a rough idle or idle fluctuates several hundred RPM, this can indicate a sticking idle stabilizer valve. With most fuel pumps the minimum fuel pressure is encountered at high rpm and WOT. This is consistent, >occuring about every 2 seconds. You’ll never be able to set the idle. Bike is a year + old, always a smooth steady idle. The diagnosis can be used in general for your car - just skip the areas which don't apply. Below is the "Idle RPM" section from the manual: Idle RPM Use this Tuning Table to set idle RPM to desired setting and to correct idle-related problems. Check the RPM and adjust idle speed screw until the correct idle speed is achieved. When I bought this car a couple months ago, it had a high/erratic idle. Then turn the air-fuel screw clockwise a little about 1/8 turn then stop. A Harley vrod don't even get into its power band until after 7K. I took for a ride thinking it will go back to normal. Erratic rpm. This condition usually results in misfire when the engine returns to idle after running approximately 2000 RPM or higher. That was too long. So the basic procedure is to set the fuel/air mixture to give you the fastest idle, then use the idle speed adjustment to set the speed to the lowest rpm that gives you smooth running. After a while it continues running but idle is very unstable. Four circuits are used in order to control the IAC valve, allowing a precise amount of air into the intake manifold. 30 second diagnosis. Being a liquid cooled, dual overhead cam, short stroke engine means it was designed to rev high and maintain consistent torque across a wide rev range. · Making idle adjustments. There's a multitude of possibilities for erratic idle, from dirty injectors (do you add fuel injector cleaner to your gas periodically?), to a bad idle air control valve (IAC). That just won’t do for a big American style cruiser. The cause was a leaking fuel pet, causing fuel to enter carbs, thus over time, flowing into the # 3 cylinder thru opened intake valves. Rev the engine to about 3000 rpm and release the throttle quickly. If idle RPM is close to 2000+, then it does not die but if lower there is high chance. As it warms up, idle goes up, finally hovering around 1500 rpm. If it starts to go down, turn it back to get the maximum idle speed. Professional Fuel Injector Pulsewidth Calculator This calculator will generate pulsewidth values for specific rpms, from idle to peak speeds. You will see if this is the case immediately when you start the engine as RPM will be half of what they should be on idle. i have been told that this all leads to the idle control valve (ICV) but thought i would ask. My idle jumps up to 1400 and go down to 1000 and jumps around, also if I’m driving and cruising around and I take my foot of the gas the car doesn’t slow down it seems to like glide even when I down shift it seems to hold at the rpm and barely goes down any idea guys?” This is a well known problem with the SRT4. Many people have removed and cleaned them but, this is normally a temporary fix and the valve should be replaced. Using a higher RPM to set the timing will result in overall low timing and poor performance. This 1997 Cadillac Deville came in with the complaint that the idle speed would sometimes be okay but most of the time as the engine warmed up it would get progressively higher and higher until the engine would run at about 3000 rpms on its own with no throttle input. Causes of a high idle. Cold start this morning at 22 Deg. To Reduce or Eliminate Erratic Operation in Tachometers 1. My wife’s 2005 FLHTCUSE2 began to develop problems a few weeks ago. A vacuum gauge needle that vibrates rapidly at idle and then seems to smooth out with rpm can indicate bad valve guides or a bad cam lobe. How complicated can mixing two things be?. The RPM would not stay stable. Erratic idle. An old time way of finding vacuum leaks is to carefully spray starting fluid where the leak is suspected. 2002 Honda Accord V6 EX just started idling roughly yesterday. engine hasn't been running but ambient temps are in the 50-60 Deg F range), the idle speed on the tach reads ~650 RPM and the speed fluctuates up and down. In addition, if the fuel level in the float chamber is set too low, insufficient fuel will be drawn through the main jet. I have a 2005 chevy colorado 4cylinder, 5 speed manual, 58K miles, and I have had a recurring problem with an erratic idle. Crimp a butt -splice connector on the other end of the diode. I have a PCIII can those come out of tunning for any. I plan on replacing this sensor for sure, but in the meantime could this be contributing to the erratic idle?. OK two things, probably the same cause though. When cold it varrys between 2 and 3K RPM. After a short ride, we stopped for her to get gas. If this sensor is out of adjustment or is failing, the result could be stalling, idle surge, flat throttle response, hesitation, or erratic engine operation. Went for a ride yesterday. Note position. After restarting, driving way, then stopping at a red light, I noticed that the car was not idling as smoothly as normal (at the usual 650 rpm range). I never expected burned valves with this erratic idle condition. Random throttle balance See this video filmed today after fiddling about with throttle cables and connectors to TPSs, Idle Valves, & Injectors in an attempt to find a cause for fault 2. Idle Valve - In order to set the correct air valve opening and thus achieve constant idle speed, the control unit uses information from the air mass meter regarding the amount of air entering the engine and from the ignition system control unit regarding rpm. Especially if the idle is too high. For about the last three months, the engine RPM has increased 1-2k when i apply the clutch. Now engine has erratic idle. 5 to 4% CO at 1100 RPM with improved throttle response throughout the midrange, which had been gasping for fuel prior. It has never actually stalled but it gets really close, then revs up to about 1500 RPM. The normal idle is around 1200 - 1400 RPM. Omg i love those prob where it happens occasionaly :[email protected] Good luck with the prob hope you find it Sent from my GT-I9100 using Motorcycle. If you have an idle problem with the unmodified NA 1. So say your engine is at 600 RPM and the idle controller. Coincident?? The high idle is around 1800-2000 rpm. Everything has to be on-spec for proper performance. It idles at 3500 RPM when warmed up. This is consistent, >occuring about every 2 seconds. I have limited experience with carburated engines, so please bear with me. Another cause of high idle could be the air intake boot which delivers air into the intake system. Last year it acquired an erratic idle where it would surge up and down at idle. They settle back after a few seconds. IAC from low mileage wreck, clen and install with new gasket. High idle will grind the transmission when shifting in and out of gears. MG MGF Technical Tiresome erratic idle problem BBS discussion at MG-Cars. Check idle speed, should be 750 +- 50 rpm. ok when i cold start the vehicle , rpm is at about 1200 which i find normal since it comes down when engine warms up. This idle problem checklist will use the same troubleshooting strategy and methodology. For a passenger car engine, idle speed is customarily between 600 and 1000 rpm. 3L is steady at 10 deg. 2) when the truck is not acting up, the truck will idle at about 1500 RPM and the only way to get it down is to stab the gas, or wait until it calms down, sometimes it does not. Reset Idle Learn = The Idle Air Learning can be reset to a default value (16 steps) - by setting this control value to 1, and turning the key off and waiting for the system to completely power down. The symptoms include stalling when coming to a stop, or very low idle after starting, or stalling if the throttle is "blipped" (opened and closed quickly). , but my foot isn't touching the pedal. That just won’t do for a big American style cruiser. Crimp a butt -splice connector on the other end of the diode. Unfortunately, these variables are all inter-related. 44 previously. During the break in it was getting erratic idling, like yoyo effect. You can now save bikes to the database. You don't want cold idle at the dead low speed anyway, the engines lube a lot of parts by splash and a higher erratic cold idle as set by hand lets the cold parts get more splash oil to live longer. RPMs are jumping between 400 and 1000 until the needle settles at 800 after 30-40sec (see video). There's a multitude of possibilities for erratic idle, from dirty injectors (do you add fuel injector cleaner to your gas periodically?), to a bad idle air control valve (IAC). The pilot screw is now in too far and the idle mixture is too lean. The idle hammer tamer took 5 minutes to install after you sent me some instructions and the bike felt smoother at idle for sure,. engine hasn't been running but ambient temps are in the 50-60 Deg F range), the idle speed on the tach reads ~650 RPM and the speed fluctuates up and down. Same kay sir vigor at vacuum leak daw ang problem. This happens when I turn off the A/C and when I turn A/C back on, rpm stays high but, steady. You may need to go back to the idle speed screw to lower the idle speed if it's now too fast. My feeling is that the carbs are synced pretty closely but that I am picking up off the intermediate jet versus. Crimp a butt -splice connector on the other end of the diode. A lower rpm will indicate that the cylinder is not producing the same power as the other cylinders so the computer counts the number of time this occurs and once it reaches a set parameter the engine turns off the injector pulse for that cylinder. 4 Idle systems 3. The engine’s idle speed also changes, based on outside conditions. Battery and coil ignition shouldn't be stressed at idle speed at all. ) 5 Engine stalls. I plan on replacing this sensor for sure, but in the meantime could this be contributing to the erratic idle?. I agree, the type of bike makes a huge difference. Achieving the best idle at under 2 turns indicates the need for a smaller idle jet. If I add more power to engine, it's running ok and also there are no fluctations when I drive car OR even there are no noticable fluctations when car have more than 1200 RPM. Also if i push her too much to go faster too quickly it starts acting like the transmission is slipping. Dirty Fuel Injector Modern vehicles are fitted with fuel injection systems, which inject fuel into the cylinders to create a mix of air and fuel to burn. I would recommend working on the idle to begin with. But my tank is full. FIAT Forum Useful Links: Unstable RPM on idle (with vibrations) The unstable rpm was the only thing wrong with mine and it ended up being my headgasket. ? Is the vacuum erratic at idle and hot? If that is the case then you have a vacuum leak somewhere otherwise I would say that you have another coil/coils that is/are going bad. Re: 320i E90 Engine vibration, rough idle and misfire i recently resolved my low frequency shaking at D/P/N with rpm needle fluctuating +/-50rpm at P and N, but stable at D the shaking is very low frequency type of shake, but very strong, can feel on the seat and even the floor. by Duane Ausherman. Random throttle balance See this video filmed today after fiddling about with throttle cables and connectors to TPSs, Idle Valves, & Injectors in an attempt to find a cause for fault 2. Motorbikespecs is a user updatable motorcycle specification database. I have recently completed all routine maintenance and the last detail was adjusting the idle screw to 8500 rpm. You may have a misfire, a vacuum leak, or a clogged/faulty idle air control valve. It authorises the passage of oil to control the phase shifter in line with the operation of the engine: - if the engine speed is between 1,800 and 6,500 rpm, - if the throttle potentiometer is not at no-load NOTE: if the solenoid valve is jammed in the open position this will result in an unstable idle and the pressure in the manifold at idle. speed may drain the battery in excessive idle situations, resulting in insufficient voltage to the ECM, ignition coil. ok when i cold start the vehicle , rpm is at about 1200 which i find normal since it comes down when engine warms up. Last year it acquired an erratic idle where it would surge up and down at idle. 6 2004 petrol. The exhaust certainly sounds regular and in constant time at idle. For example, the tach reads 2000 RPM at idle and the shift lights come on at mid-throttle. - Fluctuating idle - MIL on with DTC P2279 (intake air system leak) - MIL on with P0507 (idle control system RPM higher than expected) What's probably happened is the throttle plate is now in a different position from the one the ECM/PCM had learned. I took for a ride thinking it will go back to normal. Dealer changed plugs and cleaned air filter. To summarize, the solutions for a lazy / slow return to idle (or erratically high idle) are: Eliminate vacuum leaks; Perfect ignition. Aside from high idle issues, low idle and even sporadic stalling can both be attributed to a bad idle control valve. I don't have a garage. After restarting, driving way, then stopping at a red light, I noticed that the car was not idling as smoothly as normal (at the usual 650 rpm range). 2) when the truck is not acting up, the truck will idle at about 1500 RPM and the only way to get it down is to stab the gas, or wait until it calms down, sometimes it does not. Quick tests. Below is a diagram with general pictures of some of the parts in a typical carburetor that affect jetting. sometimes i stop without it stalling and the idle, which i have set to 1500 rpms, starts to drop in bursts, about 300 rpms per burst until it stalls. 2 in 1 LED Tachometer Gauge Digital RPM Voltmeter for Auto Motor Rotating Speed 0. Then [the tachometer reading] returns to normal. Unfortunately, these variables are all inter-related. How do we adjust an engine’s idle speed? In the past, adjusting an engine’s idle speed was easy. As im sitting here reading this thread, i notices all bikes are 04+. Any suggestions or. Mp3 previews are low resolution, the purchased WAV files are professional quality, the same sound effects used in hundreds of Hollywood feature films. so to keep from stalling i give it gas and it goes back to 1500rpms but then starts to drop again after 5. When I start the car from cold (ie. At idle, this should be at around 800RPM. sometimes it will go up to 2500rpm and idle, after a minute or so, it jumps down to 1000 and occilates between 1000 and 1500. poorly panda - Unstable RPM at idle Hello everyone, I’m having a spot of bother with my 2004 1. A big part of what makes the modern Indian Scout an exciting motorcycle is the unusual performance characteristics of its engine when compared to most other v-twin cruisers. I rebuilt my top end this winter on my 2011 YZ250 and I went to start it for the first time this year yesterday. Now, try revving the engine, if the engine looses power at the high rpm, turn the air-fuel screw 1/8 clockwise more. , Erratic Idle, Engine Idling, Engine. A lot of the items even apply to fuel injected systems. The throttle body for the Nissan Quest is known for carbon buildup, and requires regular, light cleaning to maintain peak performance. I have an 02, and my bike just started doing this. 560 Lift, 216° in/220° ex duration at. Anyone had the same issue on the past ? Any ideas what can be causing this ? The car runs perfectly, no excessive smoke, pulls like a beast. I though maybe the motor was really cold. 96Z28 code P0507 idle too fast car is a 96Z28, auto, headers, The code is P0507 (Idle Control System RPM Higher Than Expected). While driving the idle will sometimes raise up to ~1400 RPM, and sometimes drop to about. Turn off engine, reconnect TPS, start engine. How do we adjust an engine's idle speed? In the past, adjusting an engine's idle speed was easy. Would help to know how high the RPM was, but you have no tach. Starting is good. Alter the idle valve duty cycle adjust slider value. Sometimes it will idle higher or lower. I'd guess about 1800-2000 RPM, but without a tach it is hard to tell. 10: 2005 yamaha 200 hpdi fast idle 1200 to 1600 rpm: 3: Yamaha 30 DMO running on idle but wont. After a ride of around 30km assume that I stopped at the lights gear is set to 1st and clutch is pulled. My experience with burned valves in the past the engine would miss fire or skip. When I returned from my summer ride (9300 miles), the engine was rough running when the throttle was applied above idle.