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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 07-29-2010, 10:04 PM   #1
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0 Compression?

Ok, so here's the deal. My car started misfiring like crazy after a little run down the highway. I figured I'd do a compression test. Cylinders 1 to 3 are tip-top, cylinder four though as 0 compression. Where should I go from there? What are the possible issues? Bent exhaust or intake valve, broken head gasket, damaged rocker arm... Anybody ran into some similar issue? Ill take any advice I can! My next step would be a leak test. Thanks guys!
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Old 07-29-2010, 11:51 PM   #2
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ti could be a number of things, leak down and see!
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Old 07-30-2010, 12:01 AM   #3
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Did the car overheat?
It could be a broken ring land!
Or bent valves or as small as a had gasket!
GL. Leak down test will help determine if valves are good!!
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Old 07-30-2010, 02:05 AM   #4
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over rev?
had the exact same problems. #4 rocker arm came off.
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Old 07-30-2010, 04:20 AM   #5
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sounds like a broken ring land or a hole in the piston.
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Old 07-31-2010, 01:21 AM   #6
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I would say leak down, open up your radiator cap and oil cap, and listen, listen forthat air noise from exhaust, or from oil cap, listen for air in intake, and watch for bubble in coolant.
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Old 07-31-2010, 09:07 AM   #7
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leakdown and listen with a mechanics stehiscope. Probably either a bent valve or a hole in piston. Blown headgaskets and broken ringlands usually result in some compresson. 10psi or so. You'll find the air is blowing up the intake (intake valve) out the exhaust port (exhaust valve) or remove the dipstick (better than oil fill cap) and it will be blowing through the hole in the piston.
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Old 08-01-2010, 10:02 AM   #8
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thanks guys, ill look it up and keep u posted!
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