Hi, I start my 91 accord and will idle high for about 5 seconds then starts reving up and down between 1000 and 2500 rpm. I cleaned the IACV throughly and nothing. Changed the TPS (and throttle body) and nothing. Also turned the idle adjust screw both ways and nothing changed. Please help :(
THE DISTRIBUTOR WILL CAUSE THIS PROBLEM IN A HONDA TRY A KNOWN GOOD ONE .
Its a sensor for cold starts that fails idles normal after it warms up.
There is three things that will cause this problem. 1) cold idle valve 2) idle bypass screw 3) vacuum leaks. The most common is the cold idle valve. Looking at the top of the intake, next to the iac valve, you will see a brass colored cap with two screws holding it on. Remove the cover, and using a flat-tip turn the plastic valve seat all the way in until it stops. (it will push against the brass pintle, like it's supposed to). These loosen over time and basically create an internal vacuum leak. Too much air coming in at idle causes the idle fluctuation. Which brings me to item 2. If that didn't fix it, check the idle air bypass screw on the t-body. It should be set about 1.5 - 2 turns from closed. Check for vacuum leaks anywhere between the intake hose and the head. (check the brake booster too) Good luck!
It can be issue
with IAC( idle air control valve) causing the problem.
There
are many other possibilities causing these idle issues. Engine idles rough.
There
are few help links with solutions to troubleshoot such idle issues.
I
suggest you refer the link below and follow
its troubleshooting details:------
Click
the link below:-----
-----------
http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html
------------
http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html
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http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html
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http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html
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Cold start problem and vehicle shudder around 2500 to
3500 rpms
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http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
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http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
--------
http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html
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http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html
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http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
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http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
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High
Idle Problem
http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html
-------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
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http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
--------
http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
-------
http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html
----------
http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------
These
details will help.
Thanks.
For idle issue,click the help links provided below :---
Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html---------- Engine stumbles coming off idle when warm?
http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html
--------------
While stop engine idles
like cylinder missing?
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
----------
Idle flair is noticed on car? Rough idle? car
will not idle? Erratic idle speed?
http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
---------
High rpm in neutral? Inconsistant high RPM in
neutral?
http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
---------
Erratic
idle on car?
http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html
--------------
Low idle when cold out
side?
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
-----------
Idle Air Control (IAC) Valve Replacing?
http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html
-----------
intermittent engine failure while idle?
http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html
------------
Engine
quits at idle?
http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
-------------
Car
overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
-----------------
Car
not starting or turning over indicates towards multiple possibilities. It can
be issue with battery or weak battery. But if battery checks out ok, then it
can be starter issue or faulty alternator or problem with low fuel pressure or
no spark at spark plugs due to dirty spark plugs or faulty ignition
coil or injectors getting cracked or dirty and needs to be cleaned.
To
confirm the problem, the basic troubleshooting is required.
Click
this link below and follow the troubleshooting:------
http://technoanswers.blogspot.in/2012/02/car-starting-issues.html
---------
This will help.
Thanks.
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The idle problem will continue even when it's warm. I does not stop whatsoever. Another thing I noticed is that the fan starts and stops erradicaly when the car is off and warm. Could this be a computer problem, or maybe a thermostat? Thanx for the help.
so my car idles high about 1400rpm, i can disconnect the connectors to the air regulator and the idle air control valve and no change, the ignition timing is set, ive cleaned the IAA unit. car runs and drives fine with power, just idles high with adjustment screw all the way closed. also no change in idle while rotating adjustment screw with tps disconnected. i can warm the car up, shut it off and block off the end of the tube that runs to the air regulator and iacv and on plastic intake tube, the idle goes down to 1000 and sits between 1000 and 1200..my question is witch valve is my problem and is that even my problem..
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