Check engine light no worky
03-24-2004, 09:57 PM
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Car: 1978 El Camino SS
Engine: 350
Transmission: T-5 & 3.73's
Check engine light no worky
I've swapped an '87 MPFI 2.8 into an '85 Cherokee. I'm trying to find the reason for the coppy, rough idle. I wired up a light to the wires for the check engine light to check codes, but get no power to it. The manual I have shows the check engine light wire to be a brown with a white tracer. I wired a light to that wire and the other end to chassis ground and get nothing. Is there a wire connetion to a certain componant of a MPFI system thatt'l effect this? Any ideas, thoughts???
03-25-2004, 04:21 PM
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Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Did you use a computer-safe probe? I've never looked at the wiring diagram for the SES light- I don't know if it can drive a bulb directly, it might draw too much power from the computer.
I'll try to remember to check tonight!
I'll try to remember to check tonight!
03-25-2004, 06:01 PM
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Car: 1978 El Camino SS
Engine: 350
Transmission: T-5 & 3.73's
The wire that I'm connecting the test light to is the one on the harness plug that plugs into the back of the inst. cluster. My test light is a home made one using the same type of bulb that is in the dash for the check engine light.
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