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#1
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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! |
#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
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/ |
#6
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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/ |
#7
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1990 Honda Accord Idle fluctuation
I finally got around to trying to fix this again. I removed the 2
screws and sheet metal cover to check the Fast Idle Valve. I didn't feel any suction or airflow and couldn't get the idle to settle down by covering the valve seat. Thanks for your help Tegger, but I guess the Fast Idle Valve is not the culprit. Does anyone else have any other suggestions?? Mostco, the coolant is full. TE Chea, your link no longer works. Is there a way to test if the throttle angle sensor is bad? Thanks, Paul |
#8
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1990 Honda Accord Idle fluctuation
Paul Jr wrote:
> I finally got around to trying to fix this again. I removed the 2 > screws and sheet metal cover to check the Fast Idle Valve. I didn't > feel any suction or airflow and couldn't get the idle to settle down > by covering the valve seat. Thanks for your help Tegger, but I guess > the Fast Idle Valve is not the culprit. Does anyone else have any > other suggestions?? > > Mostco, the coolant is full. > ------------------- The rad has to be full as well as the reservoir. How full is the reservoir, just a puddle in the bottom ? ? (that's called empty) On a 1990 I think the system has to be 'burped' (manually), but it won't work if there's no coolant in the reservoir to displace the air. 'Curly' |
#9
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1990 Honda Accord Idle fluctuation
Paul Jr > wrote in news:867dd06e-9649-4f55-8b5f-
: > I finally got around to trying to fix this again. I removed the 2 > screws and sheet metal cover to check the Fast Idle Valve. I didn't > feel any suction or airflow and couldn't get the idle to settle down > by covering the valve seat. Thanks for your help Tegger, but I guess > the Fast Idle Valve is not the culprit. Does anyone else have any > other suggestions?? > > Mostco, the coolant is full. > > TE Chea, your link no longer works. Is there a way to test if the > throttle angle sensor is bad? > > Thanks, > Paul Another air-related suggestion: When the car is warm and the idle is fluctuating, remove the air cleaner pipe to the throttle body. Can you progressively cover the throttle body with your hand to the point where the idle settles down? What happens if you unplug the EACV? That's the idle air control valve behind the throttle body. Sometimes a stuck-open EACV causes fluctuating idle. And did you check the coolant in the rad, not the reservoir? -- Tegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
#10
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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! |
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