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94 Convertable LT1 module 4.1 H64 rt bnk lean

by Jeff Zimmerman
(Big Bear Lake, Ca.)

When you start out cold in open loop, everything is perfect, once its in cosed loop its ok for a few minutes then will start to run ruff and then kick off the H64 code. I have changed and checked every sensor and changed alomost all of them except the left o2 sensor. the right one was changed. many of the items I changed made differences in the driveabiliy of the car. She runs really well! I found some things that made diffeences like cleaning the MAF really well, changning the ICM,coil, AIT, TPS, opti and wires w/plugs, havent found any vacuum leaks. I've noticed that out on the open road for many miles the check engine lite stays out and sometime for the whole trip. I have a small crack in my left manifold that seals up once its warm. I havent been able to get under the car and check out the voltage on the 02 sensors yet. thank you for any help you can help me with! Jeff

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Jun 14, 2013
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Problem solved
by: Jeff Z

I solved the problem, I had cracked manifolds! I installed Pacesetter shorty's and problem solved.

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