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I have been having trouble with my Corsa. It sometimes just cuts out or does not want to start at random times. I have had the car serviced, I have had the starter motor replaced & am now having a new fuel pump relay replaced.
I was told today, that cylinders 2 & 4 have low compression.
What causes this to happen? Do I have to have it fixed? I was told that it could cost me anything from R5000 - R10'000. PLEASE ADVISE.
Thanks Benita

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Do you know what the compression reading were? –  Larry Jul 3 '13 at 15:42
    
When it is having problems does the motor not turn over or does it turn over but not fire? Does the check engine light come on? –  mikes Jul 4 '13 at 0:33
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I would imagine that it is because you have bent valves or you may have blown a gasket. It shouldn't cost you more than R3000 to R5000 in the worst case. And that's just because whatever the reason, they're going to have to take the top off the engine to get at whatever's the problem.

If you're in Cape Town, I would highly recommend AutoWorks in Milnerton. They did excellent work on our Astra and Corsa and they've got excellent after-sales service.

Also, as drake below mentioned "There's also the possibility of blown rings, scored cylinders, or fuel washing out the cylinders."

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There's also the possibility of blown rings, scored cylinders, or fuel washing out the cylinders. Often, pushing a small amount of compressed air using a compression testing adapter (running full 90psi shop air is too much) into the cylinder can give you a good indication by listening (exhaust/intake for valves, oil fill tube for rings/cylinder, bubbling in radiator for head gasket). –  Drake Clarris Jul 10 '13 at 5:11
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Naming as many things that you can think of that will result in low compression is neither an answer nor a way to help the original poster understand what is going on with his vehicle. –  cinelli Jul 10 '13 at 7:55
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