Six hours to trace out all fuel system controls; both electrical and mechanical. The bad part was found. It was the PCM or computer that was cycling powers and grounds off so rapidly a lab scope with a high millisecond grid was the only tool that saw the problem. Using a breakout box paired with a lab scope was the trick. Diagnostics time, and final restoration of this Ford trucks’ sensors system would all be a learning experience. Sorry about the tech speak; just excited.
Someone had to find the problem; you can’t just throw away hard to diagnose vehicles. Lucky me, I guess.
This what it looks like when things are working!
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| One millisecond of data |
Other problems found were engine oil mixed contaminated with gas.
DPFE was melted down. The catalytic convertors had been removed and tossed!
All four of them were needed for the system to work properly.
Spark plugs were so carbon fouled they were useless so they were replaced with original brand Motorcraft Platinum plugs.
Incorrect O2 sensors were not helping the problem either, new OE cost almost the same as NAPA
But what caused this to happen? My guess is a simple jump start, zappp! Do you have any ideas?
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