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[Carl]

I lost the compression in #4 cylinder this weekend.  It happened suddenly.  Pressure on front 3 cylinders is >170psi, but #4 shows no movement on the gauge.  I poured oil in the #4 cylinder and did not get any change in the pressure reading.  I pulled the valve cover so I could see what was happening to the valves.  When I added compressed air through the #4 sparkplug hole (all the other spark plugs were out too) I got air out of whichever cylinder had the intake valves open.  It sounds like I must have a stuck intake valve on #4 cylinder.  Is that possible?  Is it likely?  I will probably get the head pulled off tomorrow, but thought I would ask tonight in case there is something else I should be looking for.  

 

One other thing.  I developed a very noisy exhaust leak, either at the same time or around that time.  Quick look at exhaust system doesn't show any leaks.  Seems like it might be a head gasket?  No water in oil that I can see.  Oil is down about 1 quart after 5 sessions, which is not normal.

 

Carl

[Carl]

OK. Got the answer.  One of the #4 intake valves was stuck open.