1986 GMC Jimmy Repair Question
1986 GMC Jimmy Starting problem
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how bout replace the STM with a RM ??..try that and msg me for follow up.....good luck man
0 questions asked
Is the fuel pump running? You should be able to hear it run when you first turn the key to on. Listen with the gas cap off to be sure. Are you getting spark?
The ecm-b fuse provides power to the ecm, fuel pump relay, fuel pump, and the oil pressure switch. Test the pressure switch and check the wiring for shorts.
Good luck and let us know. :)
19 questions asked
It blows the fuse as soon as we turn on the key so I guess the answer would be no the fuel pump isn't running. We have replaced the fuel pump relay switch. How do I test the oil pressure switch? We have also replaced the ecm and i would assume it is getting spark because even with the fuse blown it tries to turn over it just won't fire.
2 questions asked
The oil pressure switch is the back up for the fuel pump relay when it goes. The PCM/ECM energizes the fuel pump relay-No power to ECM means nothing is gonna happen.
You need to track down the short involving the ECM-B circuit.
Disconnect all connectors at the ECM, replace the ECM-B fuse, now turn key to On-did the fuse blw?
68 questions asked