Odd cylinder balance test results. Possible problem.

Fett

New Member
Nov 2, 2004
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To try to solve my new lack of power problem, I used a star tester to see if I had any codes. Typical codes, I had an EGR code, thermactor code, and a temp sensor code. I have the vac line disconnected from my EGR, I don't have the smog pump, and I did the test when the engine was cold. So none of those codes helped me. So then I did a cylinder balance test, three stages.

The first stage it gave me a 90, which is pass. The second stage gave me a 40 (cylinder 4), then the third stage gave me another 90.

From my understanding of how the star tester runs this test, it does a slight cylinder drop off during the first stage, then a harder drop off on the second, even harder on the third...and so on. I am just not sure what to make of two passes and one fail.
 
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Chris, given my understanding of the graduations of the test criteria, I'm not sure how those results are possible. AFAIK, you should not have been able to pass test 3 after failing test 2.

I might run the test again in case some other anomaly creeped up during the test.

Good luck bud.