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I have a Opel Corsa 1999 B type. We had a mechanic redo the engine about 4 months ago, but this week it just does not want to start.

Today had other mechanic look at the engine, and did a quick compression test, cyclinder 1 and 4 where under the normal presure. Those cylinders where running under pressure before the engine was redone.

For a while now the engine has not been running at its best, it idelled under its normal revs and you really had to put your foot down to get some kid of preformance.

Also checked the spark plugs, All are black, and cylinder 4's spark plug has oil on it.

So what could cause the low compression so, soon after the engine has been redone?

ZioN
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3 Answers3

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Why was it redone? And was your block checked for warping? If it was warped, and not corrected, you could be facing the same problem.

FossilizedCarlos
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Oil on the spark plug is likely either because the piston rings are not sealing or the valve guides are leaking oil. Both could also be related to low compression. You could either have ring seal problems or a valve that is not seating properly. Valve seat problems could be due to physical damage or carbon build-up coming loose. Guess at what is most likely depends on what was done when the engine was last worked on.

Rob Gevers
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I've learned of two possible causes:

  1. Typically the valves at the exhaust side can where out and compression can "leak"
  2. Also there can be a break in the cylinder where the compression escapes

Are these possible in your case?

dbalakirev
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