Question about 1998 Ford F150 Regular Cab

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Rebuilt 4.2 liter F150 overheating when getting up to highway speed...no overheating at idle

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You may need a new coolant pump, if not, make sure your grill isn't all clogged up with garbage.

Posted on Sep 01, 2010

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I have 1990 ford f150 5.8 liter it idles high when in park and idles about 1200 rpm when in gear and sometimes surges up and down. i have clean the idle control and check showing 12.5 ohms still won&#


One common problem is a vac leak or a sticking throttle plate.
The computer controls idle speed by how much air is allowed into the intake. The idle control valve could be sticking even tho you have cleaned it, or have a faulty motor.

Sep 12, 2012 | 1990 Ford F150

1 Answer

MY VAN IS OVERHEATING WHAT ARE THE STEPS FOR TROUBLESHOOTING


When does it overheat? At idle, or at highway speed? Is the coolant level where it should be? Overheating at idle or highway speed may be a faulty thermostat. If it overheats only at idle then it is likely a cooling fan fault. To determine if the fan is working start the engine and switch the A/C on, the fan should come on, if it does not, then you need to have the computer "scanned" to see if it can detect the reason for the fan not coming on. If the fan is switching on, then you need to have the water pump checked to see if in fact it is pumping coolant (this could also be the cause of overheating at highway speed) If you are overheating only at highway speed you may want to have the enigine checked for a blown head-gasket, or faulty radiator.

Apr 18, 2011 | 1997 Oldsmobile Silhouette

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I was driving up 95 doing about 80 n when I got off the highway n went to a light my van just cut off


It could have overheated. run out of gas. stayed locked in high gear and stalled as it stopped. You did'nt say if it would restart? You did'nt say what engine? It can have a 2.4 liter 4 cyclinder a 3.0 liter V6, A 3.3 liter V6, or a 3.8 liter V6. It can have a 4 or 5 speed automatic transmission and the 4 cyclinder can have a manual transmission as well. It can be air condidtioned and problems with it can stall the motor. the battery can be low or dead and thiers not enough power to run the brake lights and the fuel pump both so the engine shuts down. It might restart if you turn off everthing and certainly the defroster and anything that uses electrical power.

Mar 01, 2011 | 1996 Dodge Caravan

2 Answers

I have a 1988 5.7 gmc that after start up idles fine runs stromg under full throttle but at highway speed and under no load speed it sputters and at slow speed it is running rich i have done complete...


I have a 1988 5.7 gmc that after start up idles fine runs strong under full throttle but at highway speed and under no load speed it sputters and at slow speed it is running rich i have done complete tune up rebuilt the tbi One concern i have is someone removed stock air cleaner system and the one they installed has no intake air sensor could this be the problem ?
IT CERTAINLY CAN BE THE PROBLEM. The air flow sensor if a VITAL part of your fuel delivery and emmision's system. Your mixture is controlled by a computer that uses the sensor data from that device. If you possibly can get the old one, put it back on. It is possible that I may not be totally right about this point but the operation of your engine is dependent on all the parts being there.
and also i have no codes and no ck engine light on.
There may not be code for a missing part. That system is not perfect.
I hope this helps,
Happy New Year,
Mark

Jan 03, 2011 | 1988 GMC C1500

1 Answer

1999 ford 5.4 liter v8 starts,stops for a second then goes to high idle or won't idle,when it won't idle, driving it for a while corrects no idle condition.


So you are saying for the most part that it won't idle until it gets warm? Sounds like the idle speed control motor is bad.

Jul 15, 2010 | 1999 Ford F150 Regular Cab

1 Answer

Noise at shut down


The noise is caused by the engine running on after the ignition is shut off. It makes noise because the pistons are rattling in the cylinders from incorrect timing. This has nothing to do with the mechanical or electronic timing of the engine. The engine runs on either because of hot glowing carbon deposits in the cylinder head or because the engine was shut down when it was running too fast. Sometimes the carbon can be literally blown out by running the engine at high rpm for a short time. Put it in second gear and run it for a couple of miles on the highway. If this does not work the heads will have to be removed and the carbon cleaned out manually. The shut down when running too fast problem can be caused by the idle being set too high or by shutting the engine off before it has reached idle speed. If you can adjust the idle speed try reducing it. If not always hesitate before shutting the engine down to let it reach idle speed. Good Luck!

Mar 20, 2010 | 2001 Ford F150 Styleside SuperCrew

1 Answer

Why is my 2005 jeep wrangler overheating while driving highway speeds and cool at an idle. Even after replacing the water pump, the thermostat, and the radiator????


If this vehicle has a clutch type fan it is probably the problem, good at idle but once the rpm's speed up it does not keep up with engine speed, thats why it heats up at highway speed.
Difficult to diagnose because you cant always tell if it is spinning as fast as it is supposed to be.

Nov 05, 2009 | 2005 Jeep Wrangler

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