MisFire Problem found, Bad, Bad, Bad,
Thread Starter
Instructor
Joined: Oct 2005
Posts: 150
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From: Wisconsin
MisFire Problem found, Bad, Bad, Bad,
Well after four weeks of on and off taking my car apart I found the cause of the misfire that would move from cylinder to cylinder. I pulled the connector from the bottom of the PCM and 4 pins from the PCM came with the connector and the connector seal is completely eaten away. The good news is the TAC is Okay. I am having the PCM connector body replaced and the shot pins replaced, also a new PCM. Its not going to be a good week but atleast my car will be back. Really hated to take it to the local dealer but they have been fair and honest in the past.
Anyone ever raise the mounting bracket for the TAC and PCM to get them up higher.
Anyone ever raise the mounting bracket for the TAC and PCM to get them up higher.
Thread Starter
Instructor
Joined: Oct 2005
Posts: 150
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From: Wisconsin
Originally Posted by ersatz928
Did the pins corrode because of a battery acid leak, or from rain-water?
Thread Starter
Instructor
Joined: Oct 2005
Posts: 150
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From: Wisconsin
The new connector, pins and PCM are installed now. I should have thought about taking a couple of picts when we had the car up in the air and the TAC and PCM were exposed so clearly. The seal looked like it had dried out and adhered to what ever it touched and when we pulled it apart it crumbled. When we pulled the wheel well panel to get at the PCM the area in there looked like it was covered with dried salt. So the car may have gone into a ditch full of winter salt water and sat there or was stuck. Just driving in slush would not put that much into that area. The driver side area behind the front wheel does not show any signs of this kind of garbage.
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
Originally Posted by Carol & Lee
The new connector, pins and PCM are installed now. I should have thought about taking a couple of picts when we had the car up in the air and the TAC and PCM were exposed so clearly. The seal looked like it had dried out and adhered to what ever it touched and when we pulled it apart it crumbled. When we pulled the wheel well panel to get at the PCM the area in there looked like it was covered with dried salt. So the car may have gone into a ditch full of winter salt water and sat there or was stuck. Just driving in slush would not put that much into that area. The driver side area behind the front wheel does not show any signs of this kind of garbage.
The last time I pulled my inner fender well off; I noticed white corrosion on the PCM as well. I wonder is this isn't something that is inherent with the metal used to manufacture the PCM.
I will probably get my tech to look at it next time the car is in for repairs.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
Originally Posted by Z06ufgrad2002
That's quite interesting.
The last time I pulled my inner fender well off; I noticed white corrosion on the PCM as well. I wonder is this isn't something that is inherent with the metal used to manufacture the PCM.
I will probably get my tech to look at it next time the car is in for repairs.
The last time I pulled my inner fender well off; I noticed white corrosion on the PCM as well. I wonder is this isn't something that is inherent with the metal used to manufacture the PCM.
I will probably get my tech to look at it next time the car is in for repairs.
Isn't the PCM body made from aluminum? Aluminum will get white corrosion on it when exposed to salt water or salt air. Enough salt and it will fall apart.
Bill
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Originally Posted by Z06ufgrad2002
That's quite interesting.
The last time I pulled my inner fender well off; I noticed white corrosion on the PCM as well. I wonder is this isn't something that is inherent with the metal used to manufacture the PCM.
I will probably get my tech to look at it next time the car is in for repairs.
The last time I pulled my inner fender well off; I noticed white corrosion on the PCM as well. I wonder is this isn't something that is inherent with the metal used to manufacture the PCM.
I will probably get my tech to look at it next time the car is in for repairs.
I would be interested in what you find out, you and I both live right near the water and I get salt on the side of the house from the dampness and winds.
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