Question about 1994 Ford F150 Styleside Supercab

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1992 ford bronco (full size)

It is idling about 2700 to 3000 rpm. if i block air through the intake it makes no differance. i dont believe it is an intake leak. maybe the EGR valve or the IAC valve?

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That's a huge vacuum leak. Block off intake ^ spray a little starting fluid caefully around top of engine to find when engine revs. That will locate leak. Have a fire extinuisher nearby just in case. IAC could be stuck open.

Posted on Feb 25, 2009

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Idels to high when running


I am going to assume this is a full size Bronco with a 4.9 or 5.0 engine.
The computer controls the idle speed by the amount of air allowed into the intake thru the idle air control valve.
If the throttle body is dirty or the valve fails, or if you have a serious vac leak, the engine RPM will be higher than normal.

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0996b43f8021dc34.gifThis is the location for a 5.0 ltr full size Bronco.

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1996 ford full size bronco,5.8 v-8. Replaced fuel pump,filter,cap,rotor,wires and it is still hard to start hot or cold and sometimes will not start at all and can smell fuel vapors.


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Try a smaller spark plug gap, like .028".
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Intake manifold gasket is leaking. Its like you have the throttle open to let in more air. You can spray a jet of water around the manifold and when you hit the seam that is leaking while the engine is running, the RPM will change. Or you had a vacuum hose burn or fall off.

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1 Answer

I need to adjust the idle on my bronco. I would like to trun it up 100-150 RPM's


The idle is controlled by the computer. if your idle has been getting worse you may just need to remove the air tubes and spray the intake with carb cleaner. Rev the engine some while doing this so it wont die.

Nov 11, 2009 | 1996 Ford Bronco

3 Answers

1992 ford tempo stalls when at a stop light. It runs fine when moving


Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Aug 06, 2009 | 1992 Ford Tempo

1 Answer

Will not run at an idle


Try this, it is the common reason for this problem.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

May 22, 2009 | 1987 Ford Bronco

1 Answer

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try checking the thermostat control senser. it caused my bronco to start for a second and then die. after a while it would finally start and run for a while then die driving down the road. i changed the thermostat control senser and it fixed all problems of dieing

Apr 27, 2009 | 1989 Ford Bronco II

1 Answer

Engine idles to fast and runs rough


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