Question about Cars & Trucks
Hi the engine idles ok when cold once it heats up the revs drop slightly then go back up then down as if it's going to stall
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Posted on Jan 02, 2017
I had the same problem. There are two water temparature sensors located on the housing where the top hose conects to the head. the top sensor is for the temp guage on the dash and the one below is the sensor that needs replacing.
Posted on Jul 16, 2008
Sounds like idle air control valve sticking. If i remember correctly, the idle air control valve is built into the throttle body. This is the part that connects between the air filter and inlet manifold. take this off and clean thoroughly with carb cleaner. if this does not work, then renew part.
Posted on Jan 21, 2009
I had the same issue on my 99 Trooper.
It would usually start when completely cold, but idle around 2k RPM.
It would drive fine. But if I shut it down, ran into a store, and came back out, it would start but immediately idle.
Had to ride the gas a little to get it into gear.
The Check Engine light has been going on and off for 6 months or so.
I took this to my local trusted repair shop (no Isuzu dealers within 200 miles).
The diagnosed the light, and found that the Intake Gaskets were bad or leaking.
The idling problem was related to the car not being able to control the amount of air coming in.
They replaced the Intake gaskets by the next day, and I haven't had a problem since. And no more check engine light, which has been on half a year.
Here's some details from my bill:
(1) Intake Gasket set $107.95
Misc materials $21.00
2.1 hours of Labor
The total cost to me was $345.00, and I definately don't feel gipped.
Posted on Mar 06, 2009
Check your PCV valve
spark plug model and condition
cracked vacuum hoses
overheated ignition coil
Posted on Apr 27, 2009
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