Question about 1999 Cadillac Eldorado

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Engine racing, will not idle. Not a stuck throotle

Engine racing, will not idle. Not a stuck throttle

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  • Anonymous Mar 23, 2014

    when I step on gas pedal then let off the engine sometimes still is fast. when I put in neutral sometimes the idle will race up without touching it.

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  • Master
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The trottle position sensor is the most likely problem,this is fairly common.if that is not the case the you likely need to repair leeks in the intake,base of throttlebody usually.

Posted on Sep 30, 2009

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I have a 97 jeep Cherokee that in park idles at 2000 to 2500 rpm. What is causing this?


hot engine or cold
on hot engines, that is air leaks.
every time.
or
  1. the engine does race for any air leaks (MAP sensor does that magic)
  2. ISC or IAC idle valves dead or stuck open,
  3. vacuum leaks for 20 ways.
  4. is this 4L engine, the ISC loves to stick open, LOVES.
  5. throttle cable no loose, off of gas pedal, dah factor 1.
  6. throttle valve blocked open by CRUD there. cause same as #5

i think i covered it all ways.
im a vacuum leak finding expert. (have smoke machine will not travel) LOL

Mar 07, 2015 | Jeep Cars & Trucks

1 Answer

My 2001 dodge 2500 5.9 gas engine wont stay running you have to keep giving it throotle


Having to keep the throttle plat open could be 2 things (just to start). one, the air filter is clogged(like really dirty). The other is the idle air control motor is dirty or not working. Clean the throttle body and idle air control motor with brake clean. Use a toothbrush and clean inside as best as you can. It will take a second or two to start. Then spray the brake clean in the throttle at higher RPM's.

Nov 04, 2014 | 2001 Dodge Ram 2500 Truck

1 Answer

WHAT WOULD MAKE MY CAR ENGINE WANT TO RACE FORWARD


A few possibilities:
  1. Defective throttle position sensor (TPS);
  2. Bad idle bypass circuit or idle circuit solenoid;
  3. Cracked intake manifold, throttle body assembly, or bad throttle body gasket (most likely);
  4. Serious vacuum leak somewhere.

Aug 02, 2014 | 2002 Buick LeSabre

1 Answer

Rpm goes 5000 after running a few miles


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)

Jun 14, 2014 | 1995 Cadillac Eldorado

1 Answer

Gas pedal gets stuck and keeps the car going cant stop without turning the car off


dont drive it. find the cause and fix it now.
Hot and cold engine or BOTH>?
1995 Tracker, no tranny , no 4wd , on engine options stated.
Exact high RPM in neutral, not stated...... 1500 is normal cold.
keeps going in Neutral. (nah , you have 5 ways to stop any car.
key, hand brake, foot brake and neutral. and with 4wd, 1 more neutral.
keep that in mind driving any car.
this car has up to 3 throttle cables that can stick. and more!

1: floor mats hit the pedal>? ala. Toyota style (lawsuits)
2: the three cables are, throttle. , cruise and A/T transmission kick down cable. if car is M/T and no cruise it has 1 cable.
so disconnect it, throttle fixed? (disconn,. 1 by 1, bingo?

no cure?, then its not the pedal , you meant just high idle.
yes, replace the cable or bad parts three.
ok say its not the cables.. (tests proved that)
the 95 came with 2 engines, 8valves and 16valves,
they work differently (8v love so race, 16v loves to stall)

1: ISC Stuck open, common.
2: 8v, any air leaks at all , will cause super high idle speeds.
3: throttle valve in the throttle body is stuckopen (gunk) or the return spring broken (very very rare the latter,in fact never heard of one breaking)
4: IAC (thermal idle control stuck open ,(my 97 was). and lots more.
5: on the 16v it takes 2 failures. to make high idle.
gross rich running engine (cold engine its normal) and any air leak
once hot the engine can not race unless there is huge overfueling
and an air leak.
6: the 8v has this device on the side of the throttle body.
called a dash pot. its just a fast idle vacuum servo.
if stuck open the engine will scream full time....
7: ECU stuck in limphome, can cause too high idle speeds.

we need to know which engine
http://www.fixkick.com/find-parts.html
8v or 16v first.
then does the idle race hot or cold or both (engine temperatures)
if it races , then how fast?, RPM the dash tachometer tells you that.

it can be as simple as a 50cent hose cracked.
to a dead ISC. (idle speed control) IAC is thermal idle air controller.
the IAC must be closed on a hot engine,
if the the engine never gets hot,it will scream full time.

Feb 13, 2014 | 1995 Geo Tracker

1 Answer

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).

May 04, 2012 | 1995 Ford Probe

1 Answer

Engine races when started like throttle is stuck


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

May 04, 2012 | 1995 Ford Probe

1 Answer

Recent intake gaskets replaced on the coolant system. Oil change. Tune up. When the weather got wet, like in years past, it runs rough for quite some time before it clears up, usually when the weather...


base gasket on throttle body is probaly leaking with engine idling spray alittle starting fluid on base if it idles up or dies out that is base gasket

Mar 16, 2011 | 1998 Chevrolet Express

1 Answer

2000 Chryler Cirrus - engine races all the time


Either the throttle body is being held open by something or the idle control valve is stuck open. Check where the throttle cable hooks to the throttle body, make sure the cable is not caught on something.

Jan 10, 2010 | 2000 Chrysler Cirrus

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