my buddy had a compression test ran on his eclipse and they told him that the 3rd cylinder had 25psi less than 1,2 and 4 cylinders. what is the compression supposed to be per cylinder on average and if the compression is off like that can that cause the cat converter to go bad in like 3 days? is 25psi lower compression bad enough to where you would have to rebuild the block and if so what would he have to do to get it fixed...rings, new head, valves? the car runs good though and doesnt seem to have any problems except it shot out the converter in three days..thanks
#17686, "RE: compression question.." In response to Reply # 0
>my buddy had a compression test ran on his eclipse and they >told him that the 3rd cylinder had 25psi less than 1,2 and 4 >cylinders.
Thats a bad thing.
what is the compression supposed to be per >cylinder on average
Between 160 - 220 and if the compression is off like that >can that cause the cat converter to go bad in like 3 days?
I don't see how that could make the cat go bad.
>is 25psi lower compression bad enough to where you would >have to rebuild the block and if so what would he have to do >to get it fixed...rings, new head, valves?
Well that all depends on the REASON for the low compression. Did you run a wet compression test by adding a spoonful of oil to the cylender and doing the test? This will tell you if the rings are bad or not. If the number goes up after adding oil, the rings are the most likely cause. If it's not the rings then it could be a cracked piston, or valves. You also need to run a leak down test. That will tell you if the valves are sealing correctly.
the car runs good >though and doesnt seem to have any problems except it shot >out the converter in three days..thanks
The car may seem ok but it does need to be fixed if he wants it running to the full potential. Good luck.
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