Help, got stranded in Alabama
Thread Starter
Intermediate
Joined: Apr 2007
Posts: 31
Likes: 2
From: Sumter South Carolina
Help, got stranded in Alabama
I'm on my way to Louisiana to see my father thats in the hospital everything is going smooth then all of a sudden the car started driving like crap, almost feels like a couple of bad ignition coils, I was able to get it to a garage that can do light maintenance, had them run a diagnostic. I was not getting any readings from both my o2 sensors and i got a code for my Mass Air. I cleaned off my Mass Air and had new o2 sensor's installed and it didn't kick any codes but it still run like crap, I'm lost onto what else to check. I'm $300 into repairs and still not fixed. Anyone got any ideas into what i should check next.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
I just had a friend come see me in his Viper. It would barely run and his 02's were throwing codes and I was stumped because they were new and the wiring was intact. I checked fuel pressure and it was only 20psi. Pulled the custom pump out of the tank and found a line popped off. He had just gotten gas and assumed it was bad gas. Don't let the codes sell you on the problem. Check the basics. Plugs, wires, fuel pressure. Check the harness in the back of the engine and make sure it's not being chaffed by the metal bracket. Just start the car and move the harness and see if it clears up. Cats could be clogged too. That caused me nightmares in the past. Made everything go nuts!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
There are TWO things that can cause this type of issue:
First:
Chech to see if the BCM is wet or damp. It doesnt take very much moisture to cause it to have a hemerage.
If you feel the carpet and underlayment behind the BCM in the passengers foot well and it is wet or even damp, let me know and I will tell you how to recover ....
Second:
The left and right door wiring harnesses (located inside the rubber accordion tube between the door and door frame) can ground out and cause problems like this. For now,,,, shake the heck out of it and see of you can change the symptoms. If it does, let me know and we can make strides to fix the issue.
Check those things and let me know if they resolve the issue.
BC
First:
Chech to see if the BCM is wet or damp. It doesnt take very much moisture to cause it to have a hemerage.
If you feel the carpet and underlayment behind the BCM in the passengers foot well and it is wet or even damp, let me know and I will tell you how to recover ....Second:
The left and right door wiring harnesses (located inside the rubber accordion tube between the door and door frame) can ground out and cause problems like this. For now,,,, shake the heck out of it and see of you can change the symptoms. If it does, let me know and we can make strides to fix the issue.
Check those things and let me know if they resolve the issue.
BC
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Thread Starter
Intermediate
Joined: Apr 2007
Posts: 31
Likes: 2
From: Sumter South Carolina
Thread Starter
Intermediate
Joined: Apr 2007
Posts: 31
Likes: 2
From: Sumter South Carolina
There are TWO things that can cause this type of issue:
First:
Chech to see if the BCM is wet or damp. It doesnt take very much moisture to cause it to have a hemerage. If you feel the carpet and underlayment behind the BCM in the passengers foot well and it is wet or even damp, let me know and I will tell you how to recover ....
Second:
The left and right door wiring harnesses (located inside the rubber accordion tube between the door and door frame) can ground out and cause problems like this. For now,,,, shake the heck out of it and see of you can change the symptoms. If it does, let me know and we can make strides to fix the issue.
Check those things and let me know if they resolve the issue.
BC
First:
Chech to see if the BCM is wet or damp. It doesnt take very much moisture to cause it to have a hemerage.
If you feel the carpet and underlayment behind the BCM in the passengers foot well and it is wet or even damp, let me know and I will tell you how to recover ....Second:
The left and right door wiring harnesses (located inside the rubber accordion tube between the door and door frame) can ground out and cause problems like this. For now,,,, shake the heck out of it and see of you can change the symptoms. If it does, let me know and we can make strides to fix the issue.
Check those things and let me know if they resolve the issue.
BC
Tech Contributor
Joined: Oct 1999
Posts: 41,066
Likes: 9,833
From: Charlotte, NC (formerly Endicott, NY)
The codes tell you that a measurement is out of tolerance at a certain point in the system. They do not tell you a certain item is bad. Replacing the MAP may or may not solve the problem. There are 4 potential failure mechanisms in this area. The vacuum source for the MAP, electrical issues with voltage, ground and wiring, the MAP or the PCM. If something else is causing the MAP to have an incorrect reading then you are just throwing money away. The diagnostic procedure has plenty of steps checking the MAP vacuum source, voltage, ground, wiring and connections to the MAP before recommending replacement of the MAP or the PCM.
Bill
Bill
Thread Starter
Intermediate
Joined: Apr 2007
Posts: 31
Likes: 2
From: Sumter South Carolina
The codes tell you that a measurement is out of tolerance at a certain point in the system. They do not tell you a certain item is bad. Replacing the MAP may or may not solve the problem. There are 4 potential failure mechanisms in this area. The vacuum source for the MAP, electrical issues with voltage, ground and wiring, the MAP or the PCM. If something else is causing the MAP to have an incorrect reading then you are just throwing money away. The diagnostic procedure has plenty of steps checking the MAP vacuum source, voltage, ground, wiring and connections to the MAP before recommending replacement of the MAP or the PCM.
Bill
Bill
so I know the coil works.
Tech Contributor
Joined: Sep 2005
Posts: 1,731
Likes: 82
From: New Market AL
There are TWO things that can cause this type of issue:...The left and right door wiring harnesses ... can ground out and cause problems like this. For now,,,, shake the heck out of it and see of you can change the symptoms. If it does, let me know and we can make strides to fix the issue.
BC
BC
Bill - Let's hear your ideas to fix the door wiring short. Thanks for the help.
Clyde
Edit - 20 minutes later, my wiring short is fixed. I found this post by Bill Curlee to tape up a bare wire in the door harness.
http://forums.corvetteforum.com/show...1606865&page=3
Looks like the CF (and Bill) have helped me yet again... Bill, I hope to thank you in person one day, but for now, please accept a virtual toast
Last edited by chevy406; Aug 28, 2008 at 12:08 AM. Reason: Problem fixed, recognition given...
Instructor
Joined: Jan 2006
Posts: 246
Likes: 4
From: Denton County Texas
