whats the possibilities

Asked by Jul 19, 2017 at 02:12 PM about the 1989 Ford E-350

Question type: Maintenance & Repair

89 f 350 7.5...hard start...check engine light on constantly from time key
on...cannot pull codes

1 Answer

145,535

First check the EEC relays for proper operation, then all the fuses, the last old Ford I worked on that would not read out codes had rodent damage to the main EEC harness but it did not blow any fuses, if you,still can't find anything then locate a shop that still has the old Ford OBD1 breakout box and have them check the system out, hopefully it is a wiring or grounding issue and not a failing computer as it could be hard to find a replacement.

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