My Isuzu trooper is a V6 2.8L 1990 TBI Gas, Manual Transmission. The Check engine goes on after a few miniutes at idle speed. When the car is driven, the light turns off almost inmediately, The same thing happens when driving down a slope, when you don't have to use the gas pedal. Once you press the gas pedal, the light turns off. I read the computer codes and it indicates that the problem is with the oxygen sensor. I changed it for a new one, but the problem remains.
My experience with these isuzu check engine light is that your air gas intake is not being properly regulated what you need to to change out or clean really good your kanooder valve and duflauge sensor. after those two things are taken care of reset your engine light by resetting your engine light relay or fuse.
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check the trans. fluid level. the procedure should be in your owners manual. if you cant find the procedure, a good default is to have it in neutral on a level surface with the parking brake on with the engine running. find the dipstick with "trans" or an icon of a gear on it. if it's low, add fluid. when you add fluid, add about a half a quart at a time. and after every time you add, get in, put your foot on the brake and shift back and forth from park to reverse to neutral, to drive a few times, slowly. if you're unsure of what type of fluid to use, ask the boys at the parts counter. if your fluid is not pink/clear red, you're in trouble. if it's brown, dirty, or has flakes in it, your trans is junk.
The 1990 Isuzu Trooper with a 2.8L GM engine, the diagnostic connector is located directly beneath the coin try in the front of your center console!!
Along with the typical OBD connector is two wires with a spade connector on each, one female and one male. Connect the two wires to display the diagnostic codes on your check engine lamp on the instrument cluster panel. As for finding out your codes meanings, go to your nearest public library and locate a 1990 Trooper service manual.
Inside the distributor and on the ignition module (7 pin) one of the wires to the camshaft pick-up had pushed out of the connector when I hooked up the new module. I reinserted the wire and problem was solved.
your caps should be fine between a 90 and 91 one thing you should also check is that the kanooder valve on a 90 is different from one on the 91 these would not be compatable they redid the duflage sensor plug that goes from the kanooder valve to the wiring harness. you might need a kanooder valve mod kit these are really cheap you can grab one from checker for about 20 bucks well worth it trust me.
I would go to www. my isuzu parts.com and view their index. It takes a little getting used to but you can find oiut where a lot of stuff goes and how it connects. Other than that go to a library and try to view a Haynes,Chilton or Mitchell maintenance manual for more specific stuff. If you go to my isuzu parts besure to notice the tabs at the top of each diagram --they will tell you if the diagram is for a 4 cyl, a deisel or the v6. good luck