overheated now no compression

[duballstar]

The other day I was driving and my car overheated due to a hole in the radiator (not sure how it happened) but anyway I replaced the fluid and tried to start her up and it would shake like crazy at idle and under acceleration it would act a little better. I changed my MAFs and still the problem continued. I then troubleshooted my injectors and spark plugs and found all of these were working also. My next step was compression. When I took the compression Cylinder #1 had no compression. Cylinder #2 had little compression and 3 & 4 had good compression. I don't think its the head gasket because when i took my valve cover off the oil looked clean and pure (no coolant). I also checked my bearing in the rockers on my head. These were also perfect. I'm going to take it apart this weekend but does anyone have any advice on what went wrong?

[PaddyOneThree]

only thing i can think of that would cause no compression be warped head, blown headgasket, or blown rings...id look in those 3 places. especially at the head and headgasket if you overheated

[4cefed]

There are different paths for the head gasket to fail. Sounds like it could have failed from cylinder to coolant jacket.

IF you did warp the head and have it plained, you need to have the cam journals re-centerboared. If you don't, there's a good chance the cams will snap after 1000 miles or so.

[matt4pl]

get a cylinder leak down tester, it'll tell you everything you need to know.