What causes Low/No Compression in 2 cyl of 05 PT Cruiser?

Asked by Caitlin Jun 19, 2015 at 08:38 AM about the 2005 Chrysler PT Cruiser Touring Convertible FWD

Question type: Maintenance & Repair

Engine light came on, diagnosis said it was Air Control Valve.
Went to start the car, it sputtered and wouldn't turn over. Luckily there was a repair
shop next door, and they took her in.
They say it isn't the A/C Valve, but have no idea what is wrong.
Ran a compression test, 2 out of the 4 cylinders have 0 compression. Im thinking
timing belt/water pump?

3 Answers
64,520

firebird338 answered 8 years ago

It's a blow head gasket. Some people make the mistake thinking if it was a bad head gasket I would be getting anti- freeze in the oil. A head gasket not only separates the anti- freeze from the oil it also separates the cylinders compression from each other. Sounds like head gasket is blown between two cylinders causing compression mixing of the to cylinders.

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Guru98P4KS answered about a year ago

If the timing belt were to be broken or damaged, the camshaft would no longer be able to turn anymore. This means it cannot open or close the exhaust valve or intake valve properly. As a result, the combustion in the cylinders will be ruined and no gases can get released. So, you have low compression because of it.

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