No clue
Lead Driver
Joined: Apr 2016
Posts: 7,210
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From: Bahstun
The smoke is white. I'm pretty sure it's raw fuel. And I didn't do a compression test because the motor seemed pretty healthy. Its previously passed contribution tests. I have barely any blowby and it ran very well before now. The injectors were like 6 months ago and I've had no problems until literally the day I ran low on oil. And the vc seems fine, I checked it out. I tried pushing any air out. I just stalled over and over again around the block.
Would broken/bent rockers, pushrods or valve springs cause these same issues? I could see them cause misses and rough running but mine is only happening at 900ish rpm and up
Would broken/bent rockers, pushrods or valve springs cause these same issues? I could see them cause misses and rough running but mine is only happening at 900ish rpm and up
pull VC and check pushrods, rockers wires and while there
pull GPs and do a compression test
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Trailering
Joined: Dec 2021
Posts: 18
Likes: 3
Sorry I don't always get notifications when you guys respond. Anyways, funny story time, I did a buzz test and attempted a contribution test but the truck couldn't get to operating temp before shutting down so it wouldn't lol. Well I finally got it to run for a while and warm up a little and ran the on demand self tests. And guess what? It pulled a code for cps signal intermittent. I'm gonna slam an extra cps I have in there and see if the problem is resolved. I'm still kind of new to working on cars and I always try to find the actual issue instead launching parts at it. I swear if this whole thing could have been avoided by throwing a cps of all things at it, I guess I'll just be overjoyed to have my truck back again.
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Trailering
Joined: Dec 2021
Posts: 18
Likes: 3
I made a new thread but it didn't get much action so I'm back here. My cps problem is actually a short somewhere between the 42 pin and pcm.
How exactly do you go about testing for shorts in the harness? Ive pulled everything apart and looked for visible damage and found none. I tested for continuity and everything is reading open which makes me think im doing it wrong. The harness from the 42 pin to the sensor has continuity amd ground but is not getting its 5v reference I have pinout diagrams but wouldnt mind if you guys posted them anyway in case i have the wrong ones. Again, i cant find a procedure on how to do this anywhere. Please help!
How exactly do you go about testing for shorts in the harness? Ive pulled everything apart and looked for visible damage and found none. I tested for continuity and everything is reading open which makes me think im doing it wrong. The harness from the 42 pin to the sensor has continuity amd ground but is not getting its 5v reference I have pinout diagrams but wouldnt mind if you guys posted them anyway in case i have the wrong ones. Again, i cant find a procedure on how to do this anywhere. Please help!
Lead Driver
Joined: Apr 2016
Posts: 7,210
Likes: 1,341
From: Bahstun
grab a meter and start to ohm out all wires and their combinations and make a nice 42x42 tic tac toe like chart while doing it
pin one to all other pins
pin two to all other pins
pin three to all other pins
etc
pin one to all other pins
pin two to all other pins
pin three to all other pins
etc
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Trailering
Joined: Dec 2021
Posts: 18
Likes: 3
I guess I'm confused. What am I looking for? How much resistance am I looking for? And am i doing this at the pcm side of the 42 pin connector? Assume I know nothing about electrical troubleshooting because i kinda don't lol.
Lead Driver
Joined: Apr 2016
Posts: 7,210
Likes: 1,341
From: Bahstun
if harness is removed, there should be infinite ohms between all wires, anything less is a short.
1 meg ohm is almost an open circuit
5k to 30 is a possible short
30 to.01 ohm is a dead short
1 meg ohm is almost an open circuit
5k to 30 is a possible short
30 to.01 ohm is a dead short
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Trailering
Joined: Dec 2021
Posts: 18
Likes: 3
I really appreciate all the help you've given me by the way. Thank you
Lead Driver
Joined: Apr 2016
Posts: 7,210
Likes: 1,341
From: Bahstun
Oh ok that makes sense. Ill do that. That would be testing for a short to power right? If I had a short to ground would I test the same way but with one probe on the negative battery cable? And if the harness passes both then it's definitely a problem with my pcm connector itself?
I really appreciate all the help you've given me by the way. Thank you
I really appreciate all the help you've given me by the way. Thank you
Point of reference phrase.
Checking between all the pins against each other on both sides can rule out a short between them as most harnesses do not have crossed wires.
Continuity test that beeps is not a good method IMO as they will beep with in a range of ohms.
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Trailering
Joined: Dec 2021
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Likes: 3
That's not a power or ground short test since there isn't any power or grounds attached to the harness.
Point of reference phrase.
Checking between all the pins against each other on both sides can rule out a short between them as most harnesses do not have crossed wires.
Continuity test that beeps is not a good method IMO as they will beep with in a range of ohms.
Point of reference phrase.
Checking between all the pins against each other on both sides can rule out a short between them as most harnesses do not have crossed wires.
Continuity test that beeps is not a good method IMO as they will beep with in a range of ohms.
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