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Idle is too high ck engine on - 1996 Chevrolet Corvette

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Posted on May 26, 2011


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Idle high after foot off the pedle some times. New i.a.c replace vacuum lines , clean all the ports.still does it?

Intermittent hi idle speed after engine is warm ?? 1'st;Add scan tool/ck scanned parameters,IAC % requested & so forth.....

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Apr 06, 2015 | 1999 Ford Escort

1 Answer

Engine wont back off speed when foot taken off accelerator

Jaguar has a cleaning procedure for these cars . The TBI needs to be cleaned and the throttle body relay needs to be changed /replaced. I am sure the Yellow ck engine light is on with a throttle motor code in the PCM

Aug 05, 2012 | 2002 Jaguar X-Type

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Engine Runs Rough at Idle

go to auto zone,its free ck.throtle senser

Feb 19, 2012 | 2002 Ford Explorer

1 Answer

Extreme high idle have ck for vac leaks replaced throttle body and replaced egr componet lost what could it be

What is the mileage on this vehicle? The most common cause of high idle on cars with over 80,000 miles on them is a sludged IAC [idle air control] motor. This device is controlled by the engine's computer. It acts as a computer controlled vacuum leak to keep the idle speed up when you put the car in gear, turn on the A/C or put any load on the idling engine.
These items get sludged up [usually because you are not changing your motor oil often enough] and will stick open. This causes the fast idle. First step is to remove the IAC and clean it out with carburetor cleaner [aerosol type]. Reinstall the IAC [using a new gasket] and see if that helps. Sometimes, the IAC can not be cleaned, or the cleaning procedure works for a limited time [days or weeks] In these cases, a new IAC must be installed. I hope this helps.

Aug 19, 2011 | 1994 Toyota 4Runner

3 Answers


High idle
Changed IAC still the same, shown on scanner IAC 50-60 %, if it set to 40% the Idle is ok. What cause the PCM to set IAC too high? Is any one know?

Apr 18, 2010 | 2001 Ford F250 Super Duty Super Cab

3 Answers

I changed the intake manifold on my 1997 gmc safari van that has the 4.3L engine because of a coolant leak. Now the check engine light comes on. it puts out 3 codes ( PO102 ) ( PO300 ) and ( PO507). What...

you may have broke a gasket 0n the manifold and you now have a vacuum leak explaining the high idle. also check the iac sensor it may be stock partly open or sticking

Sep 25, 2009 | 1997 GMC Safari

3 Answers

High idle with new iac valve no difference 1509 trouble code

With the engine running take a can of aerosol spray WD-40 and spray it at the vacuum lines, the throttlebody and the intake manifold gaskets. At one point you should here the engine speed decrease. If you do, concentrate the spray around the area until you are able to pinpoint the vacuum leak. If you don't find a leak, try clamping the line to the brake booster with your fingers and see if that makes a difference in the idle speed, if so the diaphram is at fault and needs replacement. Thanks, Dana

Sep 21, 2009 | 2000 GMC Safari

1 Answer

2001 Oldsmobile Silhouette surging

sounds like the idle air control motor is sticking , not sure what engine you have 3.4 litre ?? also you can ck the throttle plate right on top where the throttle cable bracket assembly part of that bracket holds down a vaccum line that has a rubber gromnet that after time leaks causing idle surge , hope this helps

Dec 19, 2008 | 2003 Oldsmobile Silhouette

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