Question about 1995 Ford Mustang

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After starting, idle will not drop below 1500 rpm engine races. apparent vacuum leak. how do I locate this leak?

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Easiest way to check for a vacuum leak is to spray some carb cleaner where you suspect a leak and engine idle will change.

I suspect your problem is with the IAC. Try changing if you can't find a vacuum leak. Cheaper to check for leak first.

Posted on Feb 23, 2011

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2 Answers

I have a 1991 Isuzu Stylus dohc (same motor in the Geo Storm GSI) and I just replaced the IAC solenoid. After replacement the idle stays around 2500-3000 rpm. Is there a reset procedure for the IAC?


This is not normal you should be idling at about 650 to 800 depending on what kind of transmission is in the vehicle .
I would look at the throttle cable sometimes they fray and hang up in the jacket see if you can move the throttle pivot on the air horn back to a good idle speed if not you have a computer problem because nothing would that at idle to make it run at 3000 rpms

Oct 22, 2016 | 1991 Isuzu Stylus

1 Answer

Tickover 1500 rpm when warm


idles too fast.
what engine?
what year?

on a gas engine, the idle speed is 100% controlled by PCM at all times. hot.
so its out of control that means the PCM closes the ISC valve.
and RPM will not drop. (its stuck open) or vacuum air leaks
jeeps use speed density EFI system using the MAP sensor.
this means all air leaks on jeeps , cause wild fast idle speeds.
that is all you need to know , to find problem (find leaks)

clean the ISC yet (idle speed control) valve.?

Mar 28, 2015 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Throttle surge at idol


surge, great post, what engine displacement.
open hood (my answers are USA only) look up, see big white
sticker that is the engine vacuum and type engine sticker)
surge hot or cold? engine.
if it surges hot, that means :
1: ISC system out of control , it job is to stop surge and 5 more things.
2: the engine is way lean and cause ISC to loose control

just 2 reasons, and can be 50 things. wrong.
is the CEL lamp out running> if not, pull the DTC codes and post them. (all)
as a mech ,we find out which it is.
(i make sure my engine can hold closed loop at idle , if not and lean it will surge. (may)
we make sure the ISC works ok (not sticking, clean it)
and then test to see , that if by my forcing it closed, by hand (ask)
i can get way below 800 RPM. most do 500 but 600 is ok.
if rpm stays above 800 closed, that means you have huge
vacuum leak or TV blackage (too thight throttle cable?)

finding vacuum leaks can be horrific, task .
there are many tricks (and tests) to do this, ask.

see that logic above, If I the mech, can not drop rpm below 800
by hand, then no ISC on earth can. not now or ever.
and proves the induction has huge air leaks
or some dolt set the spark timing 20 degrees advanced.
see it.
so as always , a tuneup is first, then as always , i always check timing,and for proper advance rates.
advances engines at idle race way too fast and the iSC will just go NUTS.

ISC = Idle speed controller , that valve that has wires.
the IAC is a thermal device and no wires and it too can stick open
when the IAC sticks open the ISC goes , yes, nuts,
nuts can be surge (ECU is hunting it)
or just racing way too fast hot, say 1500 rpm.
a slow RPm can be a stuck open EGR (50k service point)
lean will cause too low.
too rich , misfires and too low
the ISC is the last thing to work right, all else must be good.

what does your CEL lamp do?

PS: most cars, if the ECU/PCM enters Limphome, it cuts all idle controls. again, the CEL lamp. glowing while running.../????

Nov 28, 2013 | 1994 Honda Civic Del Sol

1 Answer

High rpm after putting in drive


first.... is this when the engine is cold or at operating temp. or does it make a difference.
it would help to know what make model and year, that being said, high idle is generally caused by vacuum leak somewhere or dirty throttle body . does it have a vacuum brake booster or power steering brake booster?

Mar 30, 2013 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

1988 Chevy Truck 305 Engine Idling and ****** shifting problem


check the vacuum lines going to the tranny, but it sounds like a vacuum leak, when the engine is at idle, spray a few short blasts of starting fluid around all the vacuum lines, if the rpms jump up, thats where the leak is

Jun 07, 2017 | Chevrolet Cars & Trucks

1 Answer

The tachometer shows 900 RPM on idle position but as i put the car in gear and release the clutch the RPM drops and u have to race the car manually through accelerator pedal.recomend the diagnostics a


The engine does not need to be raced when cold

The vehicles computer will adjust the idle according
to how the manufacture programmed it

After about one mine or so, the idle on most vehicles
comes down to approx 750RPM, generically speaking

When you put the car in gear,assuming it is an automatic,
the rpm will drop a 100 at most & may be adjusted by the
computer, just as it does when you put the A/C on. That is
to compensate for the change in engine load

You should be waiting for the rpm to come down to 650 to
800 & then a couple more minutes for some temp to come
up, before driving off. In cold weather wait at least 5 min or more

I think your vehicle is not working correctly, or you not explaining
it in a way I understand what answer you want

Sep 04, 2012 | Toyota Cars & Trucks

2 Answers

On depressing clutch, engine cuts out. Other times engine wont idle but race to 1500 to 2000 rpm


check all vacuum hoses for cracks rips tares or disconnection possible vacuum leak

Feb 08, 2011 | Ford Escort Cars & Trucks

1 Answer

Have a 1997 CRV. The engine idle is way high and


Try changing your idle control valve, that should do the trick!

Jan 15, 2010 | 1997 Honda CR-V

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