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Idles too fast when started and will not slow down

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Cruise control is sticking unplug the module for the cruise under the hood.

Posted on Apr 23, 2010

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What is causing the fast Idle and slowing down


well gee, there are 50 reasons.
did you scan the PCM yet, if not ,why not?
when the idle surges, that means.
NO RPM ranges stated, if super low rpm check EGR.

1: engine lean and ISC dead, or cant handle the huge engine power drop..The PCM can even make this worse!, buy hunting the ISC to find spec, idle and failing... to...
2: or any of 50 other things causing huge engine power drop and PCM can't maintain idle controls.
super lean burn.(bogging)
super rich burn, misfire for 50 reasons.

i cant hear your engine,nor feel it, or see it shake from gross misfiring.
no can i drive it and see/feel power loss,
can I?
asking net bunny's this (blind as bats)
is "OVER THE TOP" no?
so here , ill toss the dice for you
and guess gross misfiring.
ever get a tuneup this decade, if not bingo , no?

and the others...

http://jeepdied.com/Misfire101.html

link even has the 50 cause list, to show the futility of guessing!
we do 1 to 10 tests. and find it.
for sure.

as you can see EFI systems are complex.
gue$$ is not only expensive but can net you 2 problems easy.

Feb 05, 2016 | 2002 Jeep Grand Cherokee

1 Answer

1996 Jeep cold start heater location


It likely has EFI (electronic fuel injection) and an idle air control valve that regulate idle speed. They can get gummed and fail to have a fast idle when cold, or get stuck the other way, and have a too fast idle all the or regularly take its time slowing down after you take your foot off the gas. An engine temp sensor can also cause a lingering high idle if it reports the engine as still being cold after warm up.

Aug 15, 2014 | 1996 Jeep Grand Cherokee

1 Answer

My 1994 samurai idles really high when I first crank it, but later slow down. is there anyting I can do to ?


From a cold start my sami idles really fast, but as I drive it and the engine warms up it will idle correctly. Is there a way to make it idle slower from a cold start?
what engine ? 1.3 L
carb or EFI? (94 was first year of efi, and many have been converted this old)
but the answer is the same , that is normal.
on car its a fast ilde cam on the carb.
in EFI its on the software and in the IAC thermal valve.

Mar 29, 2013 | 1994 Suzuki Samurai

1 Answer

Goes full throttle as soon as it starts...


8 out of ten tps are bad from factory

Sep 24, 2012 | 1994 Honda Accord

1 Answer

94 acura legend idles fast and slow when initally starting


The butterfly valve inside your throttle body may be loose causing your idle problem. have it inspected to see if it is.

Sep 07, 2009 | 1994 Acura Legend

1 Answer

Idle fluctuates fast then slow. Knocks at 30-40 mph. gas mileage down


your ECU is faulty.
New ECU and voila problem fixed

ohh ECU= engine control unit

secondhand with do just fine.

get it fitted by professional

Apr 16, 2009 | 1999 Lincoln Town Car

1 Answer

88 dodge dakota has rough idle and stalls at slow down.


Change/thoroughly clean the idle control solenoid. It may be sticking and causing rough idling.
Cleaning it is unlikely to be more than a short-term solution.

Jan 07, 2009 | 1988 Dodge Dakota

1 Answer

When I start my jaguar, it idols at a fast speed but then as it warms up it will idol fast then slow, fast and slow and keep doing so


if it is a v12, and at idle when warm if it goes up and down then you need to rebalance the throttles, they are off balance causing the idle to raise and drop.
set the butteryflys behind the air cleaners to 2 thousands of an inch using a fella guage and make sure the linkage arms from the pedestal in the middle of the engine are set the same (one is not longer than the other)
JPTCAT

Jul 25, 2008 | 1986 Jaguar XJSC

1 Answer

1997 cougar xr7 v-6


Usually with the AC on, the idle will slow down, but your case, maybe you set the idle too fast, try set your idle slow down a little bit see if it is working.

Jul 06, 2008 | 1997 Mercury Cougar XR7

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