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Help Needed asap...No compression...Anyone here know ecotecs?

S

svttouruofl

CEG'er
Joined
Nov 20, 2006
Messages
347
Location
Southern Indiana
The car is a 2005 Sunfire with 102k on the clock and a 2.2L ecotec under the hood. Driven daily until it just wouldn't start one morning. Checked for spark and has plenty. Checked for fuel and fuel pressure both checked out okay. Checked for compression and nothing...on all four clylinders. Assumed the timing chain was broke and pulled the valve cover, but the timing chain was okay. It didn't seem loose and the tensioner and sprockets looked good too. Did the timing just jump overnight or is there something in the computer system that could cause this? I don't know much about these motors such as the firing order and what not to check the valve timing and such. Help is much appreciated.
 
sounds like it jumped time... I know the guides like to give out on them. It will still appear as though the chain is still good. What happens is the stress from starting it causes it to jump normally.
 
But would jumping time cause it to not build any compression on all cylinders? I could see if it jumped a lot but just a tooth or two I figured it would make something. It is my understanding that these are interference engines in which the valve actually makes normal contact with the piston. I didn't know if it would be possible that if it barely jumped it slightly bent all the valves causing them not to seat resulting in zero compression on all cylinders. I know I could do a leak down test to confirm this but my concern is that I don't want to fix the obvious and not the culpirt.
 
Take a flash light and aim down the spark plug port (with the spark plug removed of course) to see if you can see any chunks or indentations on the piston face. You will have normal carbon build up and if you see shiny aluminum, then the valves have kissed the pistons and more than likely bent the valves.
 
Have you tried putting a table spoon of oil in a cylinder and retesting compression? Possible that fuel washed the oil film off of the cylinder wall. If it restores compression on 1 cylinder, add to the remaining 3 and try to start it.
 
I am going to check for wash down tonight as well. It's not at my house and its sitting outside. Needless to say it was dark, cold, and snowing when I was working on it. I should know more after tonight.
 
Hey Zach, sorry i didnt get your text till late last night. give me a call or text if you need to.


generally, if the timing jumps on an interference engine you will bend all the valves on the cam that it jumped on (or if it jumped on the crank then most likely will bend all of the valves). there should be a timing mark on the cams that should line up with a mark on the valve cover or head when the crank is at TDC. should be easy to check to determine if it jumped timing or not.
 
Just got back from looking at it. First I put a little oil in a cylinder and checked for wash down and the compression gauge didn't budge off of zero. So next I located a cylinder on the compression stroke with all 4 valves in the closed position and hooked up a leak down line. As soon as I sent air into the cylinder it blew right out the throttle body. I didn't even worry with checking the exhaust at this point. The valves are definitely bent and not seating. After watching the timing marks during several revolutions the timing appears to be off 1 tooth on the exhaust and 3 on the intake, but every other rotation the timing is vise versa and is off 3 on the exhaust and 1 on the intake. Guess its time to pull the head.
 
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