Truck Electrical Problems??

powerstroker888 · Feb 15, 2015

So this truck is going to be the death of me!! I ran buzz tests and cylinder tests on it buzz tests sometimes sound fine and cylinder contribution test come back saying #5 is bad then I run the test again and it passes and then I did it like 2 other times and it did the same thing. Then ran it again and said that #5,7 were bad. Thought that it was my injector so I put a new one in. To no avail. Switched Idms with an old one. And I have replaced the uvch with an old one. Still does the same thing. Truck runs like its missing sometimes and then sometimes it runs great!! Do you guys have any ideas??

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powerstroker888 · Feb 16, 2015

Any ideas??

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bruce · Feb 16, 2015

powerstroker888 · Feb 16, 2015

I have replaced the cps. With the grey one with purple inside of it.

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ghohouston · Feb 16, 2015

ohm out the passenger side uvch first, and make sure the inner, and outer parts of the gasket/harness are staying together

ghohouston · Feb 16, 2015

powerstroker888 said:
I have replaced the cps. With the grey one with purple inside of it.

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Ford cps?

lincolnlocker · Feb 17, 2015

if number 5 is consistent on a cct then either its bad or its good and all the others are bad... lol

live life full throttle

powerstroker888 · Feb 17, 2015

Ok I will do that. And I believe that it is the ford cps. I switched number 7 injector and number 5 injector because at first number 7 wAs being bad. And when I did the switch it said that number 5 was bad. So I sent that injector back to rosewood and had him fix it. Now it's still doing the same thing and I know that it's not the injector because it's brand new.

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Lethalthreat7.3 · Feb 22, 2015

I did a big write up on almost the exact same issue only it was #2 and sometimes 4. Got it to fail a cct once then never again.
Replaced the uvch and gasket. Ohm'd each injector and verified the reading was the same at the 42pin connector over the drivers valve cover.