1989 C4 performance lacking- fixed!
Thread Starter
Heel & Toe
Joined: Jul 2003
Posts: 17
Likes: 0
From: victorville CALIFORNIA
1989 C4 performance lacking- fixed!
had a performance problem, wouldnt go very fast, seemd it was taking to long to shift, could only get up to 127, replaced all three cats, my muffler guy said one had emptied into another voila! problem solved! it is awesome now! neck snapping shifting and acceleration in every gear. thank you to all who answered my previous query, i appreciate it and corvettes rule! :thumbs: :steering: :auto:
Le Mans Master
Joined: Dec 1999
Posts: 8,540
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From: And on the fifth day, subpoenas were served to Obama senior staff
Re: 1989 C4 performance lacking- fixed! (gambleonus)
Very common with the pre-cats.
Suggest you replace the O2 sensor and check the ecm with a scanner. Rich mixture can further cause failure of the cats. 89 ecm can be problematic. Buy only an GM replacement ecm - fairly cheap if you buy it from Superior Chevy.
Pete
Suggest you replace the O2 sensor and check the ecm with a scanner. Rich mixture can further cause failure of the cats. 89 ecm can be problematic. Buy only an GM replacement ecm - fairly cheap if you buy it from Superior Chevy.
Pete
