TwinTurbo.NET: Nissan 300ZX forum - Bad compression test results
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Subject Bad compression test results
     
Posted by YlwPrlZTT on July 02, 2016 at 5:43 PM
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Message After doing a compression test today here is what I got. Its scary.

Cylinder 1 - 130
Cylinder 2 - 130
Cylinder 3 - 135
Cylinder 4 - 95
Cylinder 5 - 80
Cylinder 6 - 130

Now, cylinder 5 would explain my weird exhaust leak sound. I added oil to cylinder 4 and 5 and tested again.

Cylinder 4 - 150
Cylinder 5 - 130

Looks like worn rings. Definitely seems like it's time for a rebuild.

I will definitely test again either tomorrow or soon after. I don't know if I had the engine warm enough, I just took a short drive (about 2 miles) until the water temp was 180. I had the throttle wide open and fuel pump relay pulled, batter is also fully charged. I will post again after the second run.

     
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