Author Topic: Cranks But Won't Start�Fried O2 Sensor and Main Relay (Read 2091 times)

AlecB · « **on:** May 27, 2018, 11:50:35 PM »

My '91 died on the freeway a few weeks ago, and my mechanic just gave up. Here's everything I know:

It cranks but doesn't start. According to my mechanic, the O2 sensor and main relay were both fried. He also says that it fried the DME, but I don't think he's removed it or anything, and when I took it out it the circuit board looks totally clean.

Mechanic says it's not the fuel pump or crankshaft sensor, so I've ruled those out. He says it's a short in the engine wiring, as you can hear a brief click when you plug in a good main relay. I've removed the wiring harness, wrapped a nasty bare spot on the large alternator wire, and replaced it all, but no progress. I'm lost.

Thanks,
Alec

Jaredmac11 · « **Reply #1 on:** June 01, 2018, 11:08:40 PM »

I would say cracked cam. Open up the valve cover and verify. Takes 10 mins

Author Topic: Cranks But Won't Start�Fried O2 Sensor and Main Relay (Read 2091 times)

AlecB

Cranks But Won't Start�Fried O2 Sensor and Main Relay

Jaredmac11

Re: Cranks But Won't Start�Fried O2 Sensor and Main Relay