I can't read my codes on a 1990 f150 5.8 4x4. started good yesterday today it just cranks over.engine light stays on all the time even when it was running but couldn't read the code. could it be pcm?

Asked by Doug May 23, 2010 at 10:12 AM about the 1990 Ford F-150

Question type: Maintenance & Repair

it has a tune up within the last month. new coil. ignition module. was still running rough. read codes ( i could at the time  last week) egr valve put new one on now it just cranks over. still has engine light on but can't pull codes. thinking it is my pcm. any ideas.

4 Answers
15

Kenny Casey answered 14 years ago

ground from the battery, and also fuseable links on the passenger side of engine bay check the relays on the left side fender well they seem to rot out also they control pcm power and fuel pump operation.

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