1992 Isuzu Bighorn Repair Question
Check Engine light on
This happens after about 20 minutes of driving which made me initially think it was a problem with the O2 sensor. Apparently this could happen with unheated sensor models as the sensor is locked out by the ECU until the exhaust is up to temperature, but I think I have a heated verson.
Have you tried using a scan tool to read the codes?From when the light turns on code be a egr issue.
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Maybe manual retrieval of the trouble codes might show something.
Sorry, I meant to say if it does not show anything, you can leave the system in diagnostic mode and go for a test drive till the light shows. It might show something.
Alternatively, check for a bad ground circuit for the ECM.
Running in the diagnostic mode, had thought of doing that so will give it a go. The other thought was since the light goes out when coasting to a stop may be why no fault codes show up. I might try hitting the throttle before stopping so the light is on then turn the engine off, hopefully the light will come on and I will get a fail code.
Will let you know how we go.
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