Code 33 when cold
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Joined: Feb 2015
Posts: 77
Likes: 2
From: San Antonio TX
Code 33 when cold
I wanted to post my results of chasing a DTC 33 on my 89. The car would run normal when the outside temperatures was above 50 or if I let the car warm up before driving it. On cold mornings I would get a CEL and the car would want to die at stops. After it got to operating temperature I could restart the car and I'd have no issue or CEL.
I followed the diagnostic chart from the FSM and everything checked out until I put the MAF in the freezer. I went through the tests again and it finally came down to replacing the MAF. I have a Wells SU145 and found a hairline crack in the circuit board. Best I can figure is that with the car heating up the cracked expanded enough to make contact and allowed it to run correctly.
I followed the diagnostic chart from the FSM and everything checked out until I put the MAF in the freezer. I went through the tests again and it finally came down to replacing the MAF. I have a Wells SU145 and found a hairline crack in the circuit board. Best I can figure is that with the car heating up the cracked expanded enough to make contact and allowed it to run correctly.
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Joined: Oct 2015
Posts: 134
Likes: 6
From: Osceola WI
Thats some good troubleshooting. You recreated the conditions and tested. I too like to test things even though i should "know" the answer because more than once there is a factor that i didnt take into account.
