wtf is wrong with my buddys car?
wtf is wrong with my buddys car? I have been trying to help my buddy with his 2002 camaro a4 long tubes, air lid and cat back. He has been having an issue with his crank position sensor. We have replaced it about five times now and each time we replace it it runs well for a few months and goes bad again. Today his car started to backfire,stall and run like ****. His rpm gauge dropped all the way down to zero while it was still running. We took it to auto zone and it was the crank position sensor again we replaced it drive about 1 mile and it started to act up again. I am stumped i have no idea what else to do.
^^^I've had that "Crank Shaft Relearn " code on for over a year now, it doesn't cause my engine to run poorly, it runs 100% perfect. A couple different people have tried to do the relearn procedure and they thing because of my cam it just won't clear the code. But like I said, it runs perfect, so they just leave it on because it will not affect anything.
But, if "8urford2002" has a stock cam or a small cam.......that might fix the problem if the relearn will take. But from what I've been told by a few different reputable tuners, its not an important procedure to do.
8urford2002,
I would pop the two tops off the PCM and check to see that all the pins are good. No burnt marks around any of them or discoloration. Look at my picture below....my pin number 43 fried, from memory, I think it was the Crank Shaft Position sensor pin....................Also, check the wires and plug, make sure there's no fraying or rips in the wires that is shorting the sensor out.
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But, if "8urford2002" has a stock cam or a small cam.......that might fix the problem if the relearn will take. But from what I've been told by a few different reputable tuners, its not an important procedure to do.
8urford2002,
I would pop the two tops off the PCM and check to see that all the pins are good. No burnt marks around any of them or discoloration. Look at my picture below....my pin number 43 fried, from memory, I think it was the Crank Shaft Position sensor pin....................Also, check the wires and plug, make sure there's no fraying or rips in the wires that is shorting the sensor out.
.
thanks i will check on it tomorrow i have already left his house. Its really weird that it has fixed the problem by replacing the sensor before but it just keeps going bad. He has long tubes and hasnt gotten the o2s deleted that wouldnt cause the crank sensor to fail would it? last time this happened it threw a cam sensor code o2s and crank we replaced both the crank sensor and the cam and it ran fine for about four months. Now it is throwing thae cam sensor again and the o2s. They are newer o2 sensors about a year old. I just dont know I will check on his pins tomorrow. Thanks for the info any helps because im really out of ideas. could it be fuel related?
thanks i will check on it tomorrow i have already left his house. Its really weird that it has fixed the problem by replacing the sensor before but it just keeps going bad. He has long tubes and hasnt gotten the o2s deleted that wouldnt cause the crank sensor to fail would it? last time this happened it threw a cam sensor code o2s and crank we replaced both the crank sensor and the cam and it ran fine for about four months. Now it is throwing thae cam sensor again and the o2s. They are newer o2 sensors about a year old. I just dont know I will check on his pins tomorrow. Thanks for the info any helps because im really out of ideas. could it be fuel related?
I think I read a thread awhile ago about a guy who had a broken reluctor wheel, and it kept making the car die suddenly....and he had cam sensor codes. Bad cam sensor or anything that makes the cam sensor not work properly....will cause backfires, stalls and it will run like ****.
Maybe ask a builder/tuner about the reluctor wheel possibility?
But....if it is PCM related, it makes total sense that replacing the sensor will fix it temporarily.
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Hopefully it s bad wire from the sensors to the PCM. Or even a bad PCM would be a snap to fix.
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PCM check was a good suggestion. You may have a problem with the wiring or the plug though that is intermittent. The wires going into the plug were damaged after I had motor mounts put in. Took me a while to figure out, but it was an intermittent problem like you described, but it was easy to see when I went to inspect the sensor and noticed the wires were screwed up where they went into the plug. I ended up getting a new plug and soldering it to the wires and haven't had the issue again.
Hey....thought of something else. It was a loose ground wire that took out my PCM.......just didn't know it until I put the new one in and started the engine.
Sometimes the PCM-to-Engine Block ground wire comes loose. This is what caused my PCM to burn up. I found that burned pin and figured it was my problem. When I got the new PCM and put it in, the engine still ran like ****. A guy came to my house and spliced a new ground wire in and attached it to my valley cover bolt. Easy. He found it when my engine was running very rough like your friends is......he grabbed the wiring bundle thats coming directly out of the PCM......he rocked the bundle back and forth and it would run smooth, then bad, smooth, then bad..........I'm lucky it didn't burn up my brand new PCM, good thing I didn't try to drive it.
He then spliced a new one in instead of digging behind the engine trying to get at the normal place it bolts in....and the problem was gone.
If I remember right...the ground wire is 16 cm from the PCM in the bundle.
Check that out. That loose ground wire burned that pin on my PCM....it also fried other internal parts of my PCM. My MAF wouldn't come into play and other wierd **** was happening.
.
Sometimes the PCM-to-Engine Block ground wire comes loose. This is what caused my PCM to burn up. I found that burned pin and figured it was my problem. When I got the new PCM and put it in, the engine still ran like ****. A guy came to my house and spliced a new ground wire in and attached it to my valley cover bolt. Easy. He found it when my engine was running very rough like your friends is......he grabbed the wiring bundle thats coming directly out of the PCM......he rocked the bundle back and forth and it would run smooth, then bad, smooth, then bad..........I'm lucky it didn't burn up my brand new PCM, good thing I didn't try to drive it.
He then spliced a new one in instead of digging behind the engine trying to get at the normal place it bolts in....and the problem was gone.
If I remember right...the ground wire is 16 cm from the PCM in the bundle.
Check that out. That loose ground wire burned that pin on my PCM....it also fried other internal parts of my PCM. My MAF wouldn't come into play and other wierd **** was happening.
.
Last edited by LS6427; Jul 24, 2011 at 11:30 PM.
Guys I got it. I pulled the computer out and inspected all the pins. They were all good. So i just started to trace all the wires that plug into the computer I found a little light green wire that was burned up against the header. I cut it off and spliced some new wire on rerouted it to keep it away from the header and it runs like a champ. Thanks so much for your help guys
Guys I got it. I pulled the computer out and inspected all the pins. They were all good. So i just started to trace all the wires that plug into the computer I found a little light green wire that was burned up against the header. I cut it off and spliced some new wire on rerouted it to keep it away from the header and it runs like a champ. Thanks so much for your help guys
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