LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Car died while driving..now no start.

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Old Feb 7, 2011 | 01:38 AM
  #1  
camarozz95's Avatar
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Exclamation Car died while driving..now no start.

Well I was leaving work car started fine drove of the parking lot fine crossing and intersection at slow speeds with music on and realized I wasn't accelerating....great oh I see my car is off I coast across into another parking lot a guy helps me push me car up the hill into a parking space, keep in mind car was only running for maybe a total of 2-3 minutes if that. Anyway Had to get towed home 28 miles...

Car just shut off no hint of a stutter or shake it was like I was driving and I just turned the Key off. Car now just cranks. I still have fuel pressure so I'm pretty sure it's not a fuel issue even tried spraying starting fluid into the intake still no change. So I;m thinking no spark (went through Shoeboxes site to test ignition stuff, I have gone through the process of testing the ICM power connections, the coil continuity test, the opti wire harness test, and using AC on my volt meter to test when cranking if I was getting 1-4 volts on my ICM plug and it is...great.

So I'm lost now could it still be the optispark? I really don't want to just start throwing parts at it. I'm at a loss right now car has never had a no start stall issue. is there a way to make sure the coil is actually sparking? (disconnecting coil wire from Opti and seeing if it sparks does that work).

Sorry for the long post wanted to add as much info as possible I need this thing fixed quick. Thanks for any input.
Old Feb 7, 2011 | 02:52 AM
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Re: Car died while driving..now no start.

Originally Posted by camarozz95
Well I was leaving work car started fine drove of the parking lot fine crossing and intersection at slow speeds with music on and realized I wasn't accelerating....great oh I see my car is off I coast across into another parking lot a guy helps me push me car up the hill into a parking space, keep in mind car was only running for maybe a total of 2-3 minutes if that. Anyway Had to get towed home 28 miles...

Car just shut off no hint of a stutter or shake it was like I was driving and I just turned the Key off. Car now just cranks. I still have fuel pressure so I'm pretty sure it's not a fuel issue even tried spraying starting fluid into the intake still no change. So I;m thinking no spark (went through Shoeboxes site to test ignition stuff, I have gone through the process of testing the ICM power connections, the coil continuity test, the opti wire harness test, and using AC on my volt meter to test when cranking if I was getting 1-4 volts on my ICM plug and it is...great.

So I'm lost now could it still be the optispark? I really don't want to just start throwing parts at it. I'm at a loss right now car has never had a no start stall issue. is there a way to make sure the coil is actually sparking? (disconnecting coil wire from Opti and seeing if it sparks does that work).

Sorry for the long post wanted to add as much info as possible I need this thing fixed quick. Thanks for any input.
Iginition module? I would take the car to a dealer and have it scanned.My02.
Old Feb 7, 2011 | 04:04 AM
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Re: Car died while driving..now no start.

It's good that you tested the wiring as that's often a source of problems. To test for spark, get a spare plug and pull the easiest spark plug wire and have an 'assistant' crank it over while you look for spark. I suspect you don't have it because starting fluid made no difference, but it's good to verify. If you have spark at the plug then the problem is elsewhere, if you don't pull the wire from the coil to the opti at the opti and test for spark by holding the end about a 1/4" away from the engine and cranking it over. No spark at the plugs but spark from the coil points to the opti, no spark at either says something else.

If you have a no spark condition then take the coil and ICM to your local autozone and have them tested. I'd usually recommend testing the ICM hot and cold as they often fail when hot but you have a no start condition when cold so hot doesn't matter much at this point.
Old Feb 7, 2011 | 06:20 AM
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Re: Car died while driving..now no start.

Originally Posted by Fatdog2
Iginition module? I would take the car to a dealer and have it scanned.My02.
I have a scanner it had DTC 16 for the low res pulse. I cleared it.

Originally Posted by bw_hunter
It's good that you tested the wiring as that's often a source of problems. To test for spark, get a spare plug and pull the easiest spark plug wire and have an 'assistant' crank it over while you look for spark. I suspect you don't have it because starting fluid made no difference, but it's good to verify. If you have spark at the plug then the problem is elsewhere, if you don't pull the wire from the coil to the opti at the opti and test for spark by holding the end about a 1/4" away from the engine and cranking it over. No spark at the plugs but spark from the coil points to the opti, no spark at either says something else.

If you have a no spark condition then take the coil and ICM to your local autozone and have them tested. I'd usually recommend testing the ICM hot and cold as they often fail when hot but you have a no start condition when cold so hot doesn't matter much at this point.
Thanks for the info on the spark I did check it with a spare spark plug got nothing. So I will try the test for testing the coil and opti for spark thank you.
Old Feb 7, 2011 | 06:28 AM
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Re: Car died while driving..now no start.

Originally Posted by camarozz95
I have a scanner it had DTC 16 for the low res pulse. I cleared it.



Thanks for the info on the spark I did check it with a spare spark plug got nothing. So I will try the test for testing the coil and opti for spark thank you.
Do take the ICM and the coil to be tested if you find no spark. ICM failure won't show up as a specific code (I don't think so, anyway) adn Autozone, or equivilant, can test it for you for free...
Old Feb 7, 2011 | 06:44 AM
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Re: Car died while driving..now no start.

Pretty sure the DTC 16 points directly to the opti.
Old Feb 7, 2011 | 05:56 PM
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Re: Car died while driving..now no start.

After you cleared DTC 16 did it come back, while trying to start it? When the PCM can't find the low res pulse from the Opti it shuts down the fuel system = no start.
Old Feb 7, 2011 | 08:01 PM
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camarozz95's Avatar
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Re: Car died while driving..now no start.

Originally Posted by Injuneer
After you cleared DTC 16 did it come back, while trying to start it? When the PCM can't find the low res pulse from the Opti it shuts down the fuel system = no start.
I did clear code didn't help, but I did fix the problem bought a new coil and ICM don't know what one was at fault but the thing started right up and runs better than it ever did. I am so happy right now I could not be without a car for long. Thanks for all of the replies and help.
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