Sometimes it’s a simple problem causing your problems. SureTrack community member chuys123 had a Chevrolet Tahoe in their shop that wouldn’t start. Everything seems to check out ok but still couldn’t figure it out. They posed the question to the community, and with the help of fellow community member runtherack and others, they were able to resolve the issue.
The following Real Fix summarizes the interaction between them in the community that led to the solution.
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2003 Chevrolet Tahoe 4.8
Start and stall, Fixed PCM grounding
Customer states that vehicle will start and run for like a minute or two then stall. Might restart and run for a minute or two again and eventually will not restart at all. Customer said they were driving and instrument cluster needles went crazy and vehicle died.
Diagnostic Steps Performed/Parts Replaced
Checked fuel pressure and it is 55psi, has spark and injector pulse. The only odd thing I see is the injector pulse and spark seem amplified. The NOID light blinks very bright and the spark looks very strong, again like if it’s amplified. I have also attempted to spray starting fluid to no avail, replaced TAC module and throttle body, still the same issue. Scanner has no codes, the only weird thing is in the abs, I am able to read codes but get No Communication error for data. I disconnected ABS module and no difference. Scanner shows theft system not active.
Best Answer from Community
Check the ground cable routed from the lower right hand corner of the engine (G104) to the frame (G105). Verify the cable is tight at both ends and the cable is in good condition.
Member Name: runtherack
Found a loose PCM ground.
Repaired loos PCM ground and vehicle starts and runs as it should.
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