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-   1987 - 1996 F150 & Larger F-Series Trucks (https://www.ford-trucks.com/forums/forum28/)
-   -   92 F150 cranks but won't start (https://www.ford-trucks.com/forums/1481941-92-f150-cranks-but-wont-start.html)

vjsimone 04-09-2017 09:29 AM

For future readers;
Interesting that there was no history provided by current owner, for he may have inherited previous work performed. Also no one ask about previous work performed.

The PCM was never at fault for this event, or was it? Although it is obvious the capacitors were modified or replaced in a substandard way previously. Looks to me the soldering iron heat was too high and the soldering points may not have been cleaned properly. Possibly proper soldering technics were not utilized. But the VRef was never measured from this PCM.

As Internet rumors go, and now Forum rumors go, followers are too quick to recommend a computer replacement like a stealership would do, or followers recommend replacing capacitors in a PCM before testing the 5vdc Reference voltage the capacitors support, potentially incurring additional faults or reducing the integrity of the PCM.

In some cases, the computer replacement has fixed the immediate problem.

It also was never clear whether the current owner repaired or replaced his PCM.

“We replaced the thermostat, because we realized it was staying closed.”
How was this realized? Overheating?

I don’t think we has seen the end of this story.

sgoodman95 04-09-2017 02:08 PM

We took the EGR valve and IAC off to check for carbon blockage today to see if that may be what's causing high idle and loss of power. No blockage, put those back on. Now we're back to a cranks but won't start condition.

sgoodman95 04-21-2017 10:44 AM

Update: Ignition timing needed to be adjusted. All good now. Thanks again.

vjsimone 04-21-2017 11:09 AM


Originally Posted by sgoodman95 (Post 17132087)
Update: Ignition timing needed to be adjusted. All good now. Thanks again.

"what's causing high idle and loss of power."

Are you still having these issues?

sgoodman95 04-21-2017 11:12 AM

No, we adjusted the ignition timing and now it starts fine and is driving better than it has in years.


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