Question about 1993 Chevrolet Corsica

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High Idle all the time, replaced crank sensor + iac but 3.1 still idles high

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Check for vacuum leaks around all the vacumm hoses, upper intake manifold. fuel injector o-rings, pcv valve and throttle body.

Posted on Jul 16, 2009

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I have a 2003 Ford Crown Victoria & it's idled up high. A MECHANIC said that I need to replace the idle sensor. Wat should I do to save money


You can remove the iac sensor and clean the pintle and seat and reinstall, also clean the throttlebody plate. Check for vacuum leaks at the manifold. Try moving moving the idle air control sensor pintle out to (iac) contact the seat to close the idle gap. Reinstall and dont plug it in to the harness. See if it idles correctly, if your high idle is gone then, there is probably a dead spot in that sensor. If the idle stays high you will need a vacuum gauge to connect to the engine a get a reading to check engine idle vacuum, whic should be 15 to 21. Anything lower indicates a leak from intake areas such as injector o-rings bad vacuum tubes or hoses. Always prove things before replacing parts. Good luck

Feb 20, 2016 | Ford Cars & Trucks

1 Answer

High idle on 86 Ford Bronco II (2.9L). Have replaced IAC, TPS and ECT. Also checked all vacuum lines. No fix. Need help.


I have heard of coolant sensors staying cold and keeping idle high but not a particular model.

Jan 05, 2014 | 1988 Ford Bronco II

1 Answer

Surging idle


Bad throttle position sensor.

Nov 24, 2013 | GMC Yukon Cars & Trucks

1 Answer

Engine idles high cold or warm. I have checked the crank key-way and all is good.


too fast idle. it is too high right?
but how high? the 4wd model has
a dash tachometer. post that reading.
this has long list of cause.
The hot engine ,idles at 800 rpm A/C off.
the ECU controls that, if it dont idle a 800 hot.
then , : (im skipping cold due to harder to diagose and rpms not stated)

1; Is the coolant temp,
180F min, to 200F max , is it?
if not all EFI cars fail idle her.e.
2: next, is IAC or ISC failure.
the IAC must only be open cold.
the ISC is electric and operates under ECU control
and a 2 fast idle means the ISC has lost control.
it can lose control any time you have air leaks in the intake.
illegal.
the main page on idle is here
http://www.fixkick.com/IDLE-AIR/idle-index-home.html

the 98 specific page is here26 ways to fail. here.
http://www.fixkick.com/IDLE-AIR/16v-idle.html

even a loss distributor base clamp (bad service)
can cause idle to fail.
1: ISC(electric) dirty, clean it.?
2: bad thermostat.
3: IAC (a pure thermo device) stuck open. (my 96 was)

Sep 12, 2013 | 1998 Suzuki Sidekick

1 Answer

How do you lower the idle


The idle speed on this vehicle is controlled by the engine computer. If it seems to be idling high, the idle air control valve (IAC) may be stuck or faulty. This can sometimes be corrected by removing the IAC and cleaning carbon deposits out of it with carburetor cleaner. Some sensors can also cause a high idle, such as air temperature sensors or throttle position sensors. If everything else seems to be OK, however, the IAC is the best bet.

Dec 17, 2009 | 1994 Ford Explorer Limited

2 Answers

1993 Nissan 300ZX idles high 1800rpm cold or hot.


yes, thats the typical symptom of a IAC valve giving you trouble, try cleaning it up but ull probabbly will have to replace it
have fun
hope this helps

Nov 11, 2009 | 1993 Nissan 300ZX

1 Answer

2000 Impala:Hard start and couple times Idles extremly high


The car has OBD2 technology, You wont be able to tell without special tools. The ignition components, timing, CKP & CMP sensor, fuel line pressure, misfires, and fuel quality all need to be looked at. But to answer your question, "over 3x cranking' could be timing or fuel pressure. A bad IAC would cause a rough idle, and if the injectors were bad then it would cause a misfire too.

Jun 03, 2009 | 2000 Chevrolet Impala

2 Answers

1995 xlt ford ranger


In my 1996 ranger xl my high idle problem was due to a bad ect sensor. After I replaced that I have had no problems with high idle. Not sure if yours is idleing high all the time like mine was but that sensor fixed the problem for me. Hope this helps!

Oct 16, 2008 | 1995 Ford Ranger Supercab

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