Squealing engine still

My trooper squeals when I start it. Mostly when cold, but now that its warm outside, it still squeals. After it is started, if I rev up the engine a couple of times, it stops. Also at times when driving it will squeal out of nowhere. Also the check engine light goes on after driving for a while, but when I come to a stop it turns off. Anyone?

from what you've said, the squeel sounds like the classic loose alternator belt. could be another belt. could be a bearing. could be.... first i would replace the belt or belts and adjust it. be aware that isuzu belts tend to get tightened more than others i'm familiar with. without the scale the manual says to use, i tend to install a bit too loose (afraid to overtighten and kill the bearing) and then readjust a time or two until the squeel stops.also if your belt is old, it's better to replace than tighten at this point.

it's possible the alternator belt is causing your other symptoms, including the cel. let's see...

and have you read or had read the cel code(s) stored?

year? model? engine? trans? etc.

//bc

what is this cel code(s) stored? I put new belts on recently, but still squeals. I will try to loosen them a bit. When the car has run a while, there is no squeal. Thanks for the advice. It is a 3.2 liter SOHC 1995 automatic trans

again...
what year, model, engine, transmission....?
editadd: nevermind...i just saw it, duh..

//bc

what is this cel code(s) stored? .... It is a 3.2 liter SOHC 1995 automatic trans

when the Check Engine Light (CEL), comes on, it is indicating that a code has been stored (usually) in the computer. if you retrieve or read this code number, it will lead you to the area that isn't working correctly according to the diagnostic software. on your 1995 you have the OBD I system, which is less complete than the 1996and on OBD II system. [OBD = OnBoard Diagnostic]

the good news is, you can read your own codes by jumpering a connector and reading the number of times the CEL (check engine light) blinks to get the diagnostic code number.

it's common for the alternator belt to squeel when cold and not when warm.
it's also possible it could be a bearing. best bet is to carefully use a piece of hose in your ear, or maybe a long screwdriver and try to isolate the area of the squeel. you can also remove the belts one at a time (when cold) and see if there is a difference for one of them.

//bc

Trooperbc, you were right about the squealing alternater belt. I changed the idler pulley, and it still squealed. Tightened the alternater belt, and no noise. Awesome. Thanks.

when the Check Engine Light (CEL), comes on, it is indicating that a code has been stored (usually) in the computer. if you retrieve or read this code number, it will lead you to the area that isn't working correctly according to the diagnostic software. on your 1995 you have the OBD I system, which is less complete than the 1996and on OBD II system. [OBD = OnBoard Diagnostic]

the good news is, you can read your own codes by jumpering a connector and reading the number of times the CEL (check engine light) blinks to get the diagnostic code number.

it's common for the alternator belt to squeel when cold and not when warm.
it's also possible it could be a bearing. best bet is to carefully use a piece of hose in your ear, or maybe a long screwdriver and try to isolate the area of the squeel. you can also remove the belts one at a time (when cold) and see if there is a difference for one of them.

//bc

..... Thanks. your welcome. thanks for the feedback.

//bc

your welcome. thanks for the feedback.

//bc
Trooper is back to squealing in the winter of course. Bearing? Anyone?

I had a sqeal in my 2000 Trooper and I thought for sure it was a belt or idler. Turned out to be the intake manifold gasket; it also caused the CEL to caome on. I would have sworn it was a belt issue, but it was an air leak that sounded just like a squeal. Another possibility.