'89 running/idleing rough
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Grounded (or opened) bypass wire would be a cause of the 42. It's tan/black (mine's mostly tan these days) from terminal C at the 4 way connector at the Distributor to the barrel connector near the battery (you disconnect it to set timing) to Pin D5 at the ECM. You might also want to make sure the plastic barrel connector is in good shape - along with the wire. I usually end up forgetting that the Code is in History after a smog check - The tech will check timing and fail to clear the code and then I'll be scanning it for some other obscure problem and it'll pop up.
Thread Starter
Pro
Joined: Nov 1999
Posts: 659
Likes: 0
From: Woodland Ca
'89 running/idleing rough Reply to Thread
Originally Posted by 1slyder1
Sorry. I still don't understand. I figured y'all were talking about the catalytic converter, but you are saying "Pre" cat. I don't have a clue.
Racer
Joined: Mar 2004
Posts: 305
Likes: 0
From: Houston Texas
pre cat
Originally Posted by BIG K
1slyder1, do you understand what a clogged pre-cat is from what SunCr has posted?
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