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post #1 of 9 (permalink) Old 02-28-13, 11:31 AM Thread Starter
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NO-START WOES

Hello, Fordsters out there: I hope someone can help me. I'm working on a '97
explorer with 4.0 sohc. It will crank but won't start. This is what I've checked
so far: cam position sensor, crank sensor (after verifying supply voltage to ignition module). According to the manual I'm using, if you disconnect the cam position sensor plug and turn the key on, there should be 1.5 volts present at that plug: it's missing. I checked the connector at the pcm (wiring diagram available) and all dc voltages and ground connections appear good: there were no broken wires between the cam and crank position sensor plugs and the pcm connector, yet the 1.5 volts is missing. I bought another pcm and tried that. Still nothing!!! ANY IDEAS, ANYONE??!! By the way, this started out as an intermittent problem. The owner would complain of the no-start condition, then, after the vehicle would sit for a few days, it would start right up and run fine for a little while (longest period about two weeks) and then not start again.


Last edited by joelsford; 02-28-13 at 11:34 AM. Reason: additional info re
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post #2 of 9 (permalink) Old 02-28-13, 05:30 PM
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Re: NO-START WOES

Any codes? I'm assuming so since your chasing the crank and cam.

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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post #3 of 9 (permalink) Old 03-02-13, 03:48 PM Thread Starter
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Re: NO-START WOES

No, and that's another puzzling aspect of this whole thing. You would expect to find codes if info wasn't being Rxed/Txed. There's gotta be something I'm
not catching, and I hope to find out what it is. I'm open for any suggestions.
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post #4 of 9 (permalink) Old 03-02-13, 06:34 PM
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Re: NO-START WOES

Have you checked fuel pressure? Is it the ignition that's failing?

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post #5 of 9 (permalink) Old 03-02-13, 08:13 PM Thread Starter
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Re: NO-START WOES

No, the ignition system is ok (as far as I've tested): the coil pack is getting 12V. It's not getting any trigger pulses from the ecm. As far as fuel pressure,
the ecm turns the pump on initially at key-on, which it's supposed to do, but during cranking there's no fuel pump turn-on from the ecm, which, according to the service info I have, needs to see pulses from the cam sensor to turn the fuel pump on when cranking. There's also supposed to be a small voltage to the cam and crank sensors from the ecm, but this voltage is missing, which made me think the ecm was bad, but I installed another unit and still no luck.
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post #6 of 9 (permalink) Old 03-03-13, 08:26 AM
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Re: NO-START WOES

What you're describing sounds like a faulty switch to me, I'd check the PCM power relay. You may have carbon build up or arcing damage to the internal contacts.

http://repairguide.autozone.com/znet...3f8021b98b.gif

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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post #7 of 9 (permalink) Old 01-23-14, 10:22 AM
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Re: NO-START WOES

Having pretty much the same problem with my '99 explorer Sport 4.0 SHOC. Wouldn't start yesterday so I gave it a little shot of ether and still nothing. Removed and replaced the key and still nothing. Slammed the hood shut and it fired right up. Loose connection or bad module somewhere?
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post #8 of 9 (permalink) Old 01-23-14, 07:00 PM
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Re: NO-START WOES

Sounds more like a loose connection. Can you hear the power relay click when it doesn't want to start?

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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post #9 of 9 (permalink) Old 01-27-14, 08:18 AM
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Re: NO-START WOES

Didn't listen for the power relay. I wiggled the key last time this happened and it started. I'm leaning toward anti theft or switch now.
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