Question about 1988 Jeep Comanche

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Engine races after start up

Throttle is not stuck... but engine races out of control after starting....I just bought the vehicle today. The previous owner replaced the piston heads, rings and bearings. It has a 2.5 litre and it's a 1988 jeep comanche.

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More than likely if its a fuel injected (multi port on the manifold) than it is the IDle speed sensor on the right side of the throtle body.

Posted on Jul 10, 2012

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Check for vacuum leaks. Make sure intake manifold bolts are tight and gasket is good. Check all vacuum hoses too.

Posted on Aug 22, 2010

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Check engine temp sensor and wires to ecm. ive seen this before ecm thinks the engine is realy cold it can cause this problem.

Posted on Jun 21, 2009

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Posted on Jan 02, 2017

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SOURCE: Jeep running rough; black smoke from tailpipe; dying occasionally

Have you taken a spark plug out yet? You may have fowled them out. if they are not clean and have a whitish tone to them, then they need to be replaced.

Posted on Nov 28, 2008

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SOURCE: 2001 jeep Grand Cherokee fuel injectors

check the injectors on that bank for pulses.. a regular 12v text light will do it should flash when cranking... its very possible that the crank sensor or camshaft sensor on the replacement engine is bad and giving you all the problems you have now.. are you using the original injectors? if you have injector pulses then check the coil for pulses the same way.. btw make sure you have 12v to them even before cranking engine could be a bad asd relay..wet plugs on one bank would also indicate a possible leaking injector and basicly draing the fuel starving the oposite bank for fuel.. to verify that the rail must be lifted by removing all 4 bolts make sure the clips hold the injectors firmly and turn the key to run but dont crank it then look for fuel leakin from bottom of injector(s) any drips is a bad injector..

Posted on Jan 28, 2009

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SOURCE: need wiring diagram for 1988 jeep comanche 4x4 6

check the solenoid on the starter it powers the ign for starting then switches to run when you let off key,either the solenoid is bad or a wire to the solenoid has come unhooked and sometime they have an in line fuse which can blow.

Posted on Sep 27, 2009

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My 85 f250 460 engine with holly carb starts up then engine races way to high


In 85 Ford used a carb spacer that also had the EGR attached.
2340515603_eefbe3f99a_z.jpg
It could be that the gasket has broken and it has a large vacuum leak. Also the EGR could be stuck open. Look for other vacuum leaks like the PCV and brake booster vacuum systems. A 460 engine will run with huge vacuum leaks especially when the choke is on but the extra air will lean out the mixture and could cause damage.
Enclosed is a video about setting idle on a Holley carb which you may not need but others looking at this post may like to see.

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OMG, its got the Toyota Disease. next is Medial and lawyers.

i think you mean to post with foot off the the throttle, in say DRIVE
the engine races to 5000 RPM , total idle failure,
bad idle controls,
bad idle can happen on any car and can be caused by 2 things.
and is dangerous, (you can cut the key to stop any engine)

1: the throttle is really stuck. check the linkage end to end.
2: the IDLE control valve, ISC is stuck open. clean or replace it.

the cars ECU does all it can to prevent this, but can not help
if there are hard failures. ISC or throttle linkages failure.
there is a throttle return spring too, that can break (very rare)
the throttle bore can get so dirty that it can stick open.
on some cars, NO ENGINE STATE
Speed density engines, (MAP) will race for ANY VACUUM air leaks
to the intake plenum , (cracked hoses, etc)

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Raceing idle


Hi Terry
yes you are right, your previous work caused the problem.
look for a disconnected vacuum hose somewhere from/to the manifold or throttle body, do visual check first with engine off, if you didn't see any disconnected hose, start up the engine and follow the hissing noise.
Good Luck

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Throttle seems stuck on a 1995 ford probe as when engine is started it races with no control


This sounds like a major vaccum leak or a stuck IAC(idle air control) motor.Look for a loose/broken vacuum line(a large hose feeds the brake booster and the PCV valve).(my stepson's Sable had a rotten vacuum elbow).

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check your throttle cable it where it hooks up to the iac valve there may be somthing in the way if not take off the iac (idle air control) and clean it. it may have a bunch of **** in it

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Have a '95 Windstar. Was traveling about 45 mph today and the rpm gauge continued to stay where it was and the brakes barely stopped the car, while the engine continued to race as if still moving at 45...


There is more to the throttle then just the pedal. The cable at the other end by the throttle body could have been stuck or the throttle position sensor had an issue.

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Engine Racing


It may be the cruise control cable - I had a vehicle do this to me before. The engine raced as soon as I started it, even in park. A couple of times, it stopped racing - then I pressed the gas pedal, and the RPMs did not drop when I released the pedal.
If it acts somewhat like that, check under the hood and find the cruise control system - it is most likely a 3-4" diameter, 5-6" long cylinder-like object mounted on top of the engine with a long cable coming out of it going toward the back of the engine. Check all of the clips on the cable and make sure they are intact, then make sure the cable is fully attached to the throttle body at the end. My cable came loose and got itself wedged in the throttle body, preventing the throttle from closing.
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