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.


thank you

 

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.

 

Please let us know what you find?

 

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.

 

If the compression is good and the misfire is limited to one cylinder, I'd think coil pack or injector.

 

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?

 

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.