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1990 Honda Accord Idle fluctuation
My 1990 Honda Accord 2.2L started to have idle fluctuations
yesterday. The RPM will fluctuate between 1700 and 1000 RPMs when the car is stopped. The fluctuations don't seem to be noticeable when the car is in gear. What would cause this? I searched for vacuum leaks but couldn't find anything. I recently did a tune-up. Please help! |
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#2
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1990 Honda Accord Idle fluctuation
A strong candidate: Top off and monitor the cooling system. It cools certain engine
control sensors. If they are not fully immersed, then the wrong signal gets sent to the engine control computer. You should do a proper purge of air from the system as well, though its said over time the air will vent itself. I prefer going through the roughly half-hour, fairly easy, idle purge procedure described in the owner's manual and Factory Service manual. > wrote > My 1990 Honda Accord 2.2L started to have idle fluctuations > yesterday. The RPM will fluctuate between 1700 and 1000 RPMs when the > car is stopped. The fluctuations don't seem to be noticeable when the > car is in gear. What would cause this? I searched for vacuum leaks > but couldn't find anything. I recently did a tune-up. Please help! |
#3
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1990 Honda Accord Idle fluctuation
On Nov 20, 10:28 am, "Elle" >
wrote: > A strong candidate: Top off and monitor the cooling system. It cools certain engine > control sensors. If they are not fully immersed, then the wrong signal gets sent to the > engine control computer. > > You should do a proper purge of air from the system as well, though its said over time the > air will vent itself. I prefer going through the roughly half-hour, fairly easy, idle > purge procedure described in the owner's manual and Factory Service manual. > The coolant system is working properly. Any other ideas? |
#5
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1990 Honda Accord Idle fluctuation
replace the PCV valve, and clean the Mass Air Flow (MAF) sensor,
remove the idle screw and clean the assembly with carb cleaner if that doesnt fix it then check the Idle Air Control Valve and adjust the Fast Idle Valve, excerpt: "its the cylinder on the driver side of the intake manifold, with the triangular cap with 3 screws. pull them out and take the cap off, and twist the outer white ring clockwise until its as tight as possible, and close it back up." http://www.honda-tech.com/zerothread/1704468 On Nov 20, 12:13 pm, wrote: > My 1990 Honda Accord 2.2L started to have idle fluctuations > yesterday. The RPM will fluctuate between 1700 and 1000 RPMs when the > car is stopped. The fluctuations don't seem to be noticeable when the > car is in gear. What would cause this? I searched for vacuum leaks > but couldn't find anything. I recently did a tune-up. Please help! |
#6
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1990 Honda Accord Idle fluctuation
wrote in news:d75aec50-7389-41a3-aed1-b6f2395e5594
@d27g2000prf.googlegroups.com: > replace the PCV valve, and clean the Mass Air Flow (MAF) sensor, This car doesn't have a MAF. > remove the idle screw and clean the assembly with carb cleaner > > if that doesnt fix it then check the Idle Air Control Valve and adjust > the Fast Idle Valve, You can't "adjust" the Fast Idle Valve. It gets stuck open on account of neglected coolant changes and results in a massive air leak when the car is warm. > > excerpt: "its the cylinder on the driver side of the intake manifold, > with the triangular cap with 3 screws. pull them out and take the cap > off, and twist the outer white ring clockwise until its as tight as > possible, and close it back up." The Fast Idle Valve on this car has two screws, has no white ring and is non-adjustable. -- Tegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
#7
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1990 Honda Accord Idle fluctuation
| What would cause this?
Mine had this problem, cause was throttle angle sensor ( a variable resistor ). See http://www.autozone.com/servlet/UiBr...r ameters=001 |
#8
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1990 Honda Accord Idle fluctuation
Yes! the fluctuations are only when the car is warm. How do I test for
a stuck Fast Idle Thermo Valve? Thank you, Paul > > I'll bet the fluctuations are only when the car is warm. > > If so, it's a stuck Fast Idle Thermo Valve. There is a way to test for > that. > > -- > Tegger > > The Unofficial Honda/Acura FAQwww.tegger.com/hondafaq/ |
#9
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1990 Honda Accord Idle fluctuation
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#10
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1990 Honda Accord Idle fluctuation
Paul Jr > wrote in news:43771d97-174b-4f42-ba99-
: > >> >> I'll bet the fluctuations are only when the car is warm. >> >> If so, it's a stuck Fast Idle Thermo Valve. There is a way to test for >> that. >> >> > > > Yes! the fluctuations are only when the car is warm. How do I test for > a stuck Fast Idle Thermo Valve? > The Fast Idle Valve is a round, sort of tower-like thing to the left (driver's) side of the intake manifold, between the "PGM-FI" logo and the valve cover. It has two screws on top of it that hold a sheet-metal cover in place. With the engine fully warmed up and the idle fluctuating, remove the two screws and the cover of the Fast Idle Valve. Feel the valve seat area with your finger. If there *is* air flow (suction), the valve is stuck open. You will probably find that once you cover the valve seat with your finger the idle will settle down. -- Tegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
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