2005-2009 Mustang S197 Discussion & News

cylinder compression

Old 9/4/15, 09:56 AM
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cylinder compression

I have 2005 gt with 4.6 what should the compression be in the cylinder. has a code for misfire cylinder 5, which is the same cylinder that I had to have sleeved due to a crack in the block. had the valves done on the cylinder also and the head was pressure tested.

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Old 9/5/15, 03:18 PM
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I don't think there is a set number to hit. I do know that all of the cylinders should be within 10% of each other. If you get below 130 you definitely need to do some work.
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Old 9/5/15, 04:59 PM
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Please let us know what you find?
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Old 9/7/15, 09:17 AM
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I think the compression is good, but now it is getting hot. I switched the coil packs and got the same code. I changed the thermostat thinking it was sticking but that did not help. what else can I do to figure this out.
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Old 9/7/15, 09:41 AM
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If the compression is good and the misfire is limited to one cylinder, I'd think coil pack or injector.
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Old 9/9/15, 06:09 AM
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well it ended up blowing white smoke out exhaust, so I am thinking head gasket, took all plugs out was going to check compression in all cylinders. on cylinder 5 it was full of antifreeze, same one that it was throwing mis fire code. question, before it started getting hot if you held up a piece of paper over the tail pipe it was like it was sucking the paper against it, could I have a exhaust valve sticking? and would that cause my mis fire and now coolant in the cylinder?
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Old 9/10/15, 02:31 PM
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Drain everything quick before it rusts up the cylinder walls and rings. Oil and Antifreeze. As far as coolant being in the cylinder, either there is a hole in the piston wall or the head gasket has bit the big one.
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