1985 f-250 wiring problem

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May 4, 2004 | 01:26 AM

wndrhmr

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1985 f-250 wiring problem

I have a 1985 f-250 4.9L inline six. Several weeks ago while driving on the freeway the engine shut off. The fuel system appears to be working well, but no spark. I've tested the coil, changed an old ratty tfi module, and continuity tested all of the wires. when I voltage tested the connector to the tfi module the #1 and #3 wires tested well below 3/4 of battery load. do these wires go to the eec? my chilton wiring diagram does not match mine. In fact my wiring more resembles the 86 wiring diagram. The timing seems to be set right. the computer codes I recieved are as follows (i don't know where some of the sensors are.): 21, 22, 41, 51, 112, 211, 212, 332, 542, 621. Does any one know if any of these would cause the engine not to spark?

May 4, 2004 | 01:13 PM

Franklin2

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From: Virginia

#211 would.

You have a lot of codes. Most of them are sensors that have failed to send the proper voltage signal. It's too much of a coincidence that they would all fail at once. You may have a harness problem or a ground problem. #542 is actually called "fuel pump circuit was open, EEC processor to motor ground". I would check all your wiring in the engine compartment very carefully, and make sure the grounding system is not corroded and is in good condition.