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Car will not start, but turns over?

Tiny
VSANT76
  • MEMBER
  • 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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Friday, February 3rd, 2012 AT 3:50 PM

15 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
You only have 55-60psi compression?If so thats why it wont. Start most likely the timing chain jumped time really common on that car. When you checked the compression on the engine did you hold the gas pedal all the way to the floor and cranked it over ten compression strokes?If not you need to do that and post the results. The engine wont start and run with that low of compression.
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Friday, February 3rd, 2012 AT 4:24 PM
Tiny
VSANT76
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No, I didnt hold the gas pedal at all and I only turned it over 3 times. I will redo the compression test. I will not be able to do so till sunday morn, can I reply/post them
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Friday, February 3rd, 2012 AT 4:36 PM
Tiny
SATURNTECH9
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Yes you can post then also the security light isnt on solid or flashing is it?
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Friday, February 3rd, 2012 AT 5:29 PM
Tiny
VSANT76
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  • 26 POSTS
Im not sure, where do look for the security light?
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Friday, February 3rd, 2012 AT 5:40 PM
Tiny
SATURNTECH9
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It would be on the instrument cluster.
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Friday, February 3rd, 2012 AT 5:53 PM
Tiny
VSANT76
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Ok I will check when I get home, thanks
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Friday, February 3rd, 2012 AT 5:55 PM
Tiny
SATURNTECH9
  • MECHANIC
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Your welcome keep me posted.
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Friday, February 3rd, 2012 AT 5:59 PM
Tiny
VSANT76
  • MEMBER
  • 26 POSTS
I FINALLY FOUND TIME TIME TO REDO COMPRSSION TEST AND A LEAK DOWN TEST RESULTS:
CYLINDER 1- 20% COMPRESSION
LEAKDOWN TEST 75% LOSS LEAKING INTO CYLINDER 2 / EXHAUST
CYLINDER 2 - 25% COMPRESSION
LEAKDOWN TEST 80% LOSS, LEAKING INTO CYLINDER 1 /EXHAUST
CYLINDER 3- 30% COMPRESSION
LEAKDOWN 80% LOSS, LEAKING INTO CYLINDER 4 / EXHAUST
CYLINDER 4- 75% COMPRESSION
LEAKDOWN 75% LOSS, LEAKING INTO CYLINDER 3 / EXHAUST

THERE WAS NO LEAKAGE INTO THE COOLANT OR OIL PAN OR THROTTLE BODY
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Friday, February 10th, 2012 AT 1:58 AM
Tiny
SATURNTECH9
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So what was the actual psi readings of compression for each cylinder?When you say percentages of compression do you really mean psi of compression?If so most like the timing chain let go and damaged the valves.
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Friday, February 10th, 2012 AT 4:33 AM
Tiny
VSANT76
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MY APOLOGIES, YES I MEAN PSI, NOT PERCENTAGES(I GUESS I HAVE MONEY ON MY MIND)IF THE CHAIN HAS LET GO, WOULD IT BE VISUALLY BROKEN OR OFF THE SPROCKET. AND IS IT WORTH TO REBUILD IN A MACHINE SHOP?
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Friday, February 10th, 2012 AT 5:13 AM
Tiny
SATURNTECH9
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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.
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Friday, February 10th, 2012 AT 7:31 AM
Tiny
VSANT76
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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)
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Thursday, February 16th, 2012 AT 4:00 PM
Tiny
SATURNTECH9
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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.
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Friday, February 17th, 2012 AT 6:20 AM
Tiny
VSANT76
  • MEMBER
  • 26 POSTS
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
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Friday, February 17th, 2012 AT 4:06 PM
Tiny
SATURNTECH9
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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.
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Friday, February 17th, 2012 AT 9:24 PM

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