Mechanics

CAR WILL NOT START, BUT TURNS OVER ?

2002 Saturn L100 • 97,000 miles

Brand new battery, fuel pump turns on, new filter, fuel pressure 49psifrom the rail. Injecters removed cleaned external pressure cleaned. Throttle body was dirty (black)removed and cleaned out with Q-tip and cloth, new rubbers.
new spark plugs, spark tested and all 4 channels off of coil pack checked out.
replaced ignition control module anyway (agaist my better judgement, was talked into)
removed valve cover inspected timing chain (appears to be on, not broken)
Did a compression test, all for chambers were 55-60, im assuming it was low due to the engine being cold, and not being able to start.
used a inspection camera to look into the plug chambers, the walls dont appear to be scorched or have groves.
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Vsant76
February 3, 2012.



You can try and remove the valve cover and see if you can see the chain loose. Thats what I would do first I have seen the valve guides even get split from the pistons hitting the valves. Lets see what we find with removing the valve cover. Worse case senerio you need a head and timming chain set. Let me know what you find and we will go from there.


Saturntech9
Feb 10, 2012.
Ok found time to remove valve cover and timing chain cover, I have noticed the timing marks do not line up (sprocket/chain), also when I manually cranked the the shaft the chain would give slack then it would tighten up? I havent touched any of the tensioners, I haulted for now before I pull the head (i dont want to miss any important clues)


Tiny
Vsant76
Feb 16, 2012.
There is only one tenisor which is screwed into the engine on the left side of the side of the timing cover. The chain shouldnt slack while turning it over. So are you saying the colored links on the timing chain arent lining up with the cam sprockets?If so they wont till the engine rotates around like 33 revolutions. Keep turning it around most likely one of the colored links will line up and the other one will not. We need to do that so we can see how many teeth the chain jumped. If its not too many we can put a new timing chain kit in it.


Saturntech9
Feb 17, 2012.
I was able to remove the head, all cylinders look ok, except #1 it appears to have been hitting the exhaust valve, and there was a piece of molten medal just sitting there? Pic supplied


Tiny
Vsant76
Feb 17, 2012.
So does that melted chunk pop off?Also is the valve guide split on the bent valve?Sometimes when the valves get hit they split the valve guides.


Saturntech9
Feb 17, 2012.
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