C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

It Just Quit

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Old Nov 6, 2015 | 04:36 PM
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Default It Just Quit

Fortunately I was on a back road this afternoon when the engine just stopped. It cranks but won't run.

Does this sound like the ignition control module? Any way to test it?

Rick
89 Coupe, 97K

Last edited by shootnstarz; Nov 6, 2015 at 04:38 PM.
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Old Nov 6, 2015 | 04:42 PM
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Originally Posted by shootnstarz
Fortunately I was on a back road this afternoon when the engine just stopped. It cranks but won't run.

Does this sound like the ignition control module? Any way to test it?

Rick
89 Coupe, 97K
check your fuel pressure .
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Old Nov 6, 2015 | 04:47 PM
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And spark. When it won't run, what's missing; spark or fuel?
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Old Nov 6, 2015 | 04:57 PM
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easyest thing to start is either a fuel pressure gauge onto the schaeder valve or squirt starting fluid in as somebody else cranks engine. if it fires u have spark. but yah. either coil/ignition or fuel. should be easy to find with help here.

do u own a fuel pressure gauge?

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Old Nov 7, 2015 | 11:04 AM
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Fuel pressure, 50 cranking pounds. It seems much more like an ignition issue than fuel, all the fuel system is less than a year old.

The FSM only shows something it calls a "terminal module" inside the distributor, doesn't say what it does. Is this the ignition module?

Also noticed thet yellow coil wire had gotten hot and melted a little bit of insulation. Not sure if it has anything to do with it but the wire's still perfectly intact.

Off now to get a spark tester.

Rick

Last edited by shootnstarz; Nov 7, 2015 at 11:05 AM.
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Old Nov 7, 2015 | 11:50 AM
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OK, got good fuel pressure but no spark.

RH
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Old Nov 7, 2015 | 12:15 PM
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take your coil and icm in and get tested
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Old Nov 7, 2015 | 12:52 PM
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Originally Posted by antfarmer2
take your coil and icm in and get tested

looking fwd to hearing how coil test goes. i think there is a way to test for voltage at coil on the car? ive never had spark issues yet so havnt done it.
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Old Nov 7, 2015 | 02:39 PM
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Took a crap shoot and bought a new ICM, installed it and the engine didn't turn a millisecond before it fired right up.

Man if feels good to do your own repairs, thanks for the input guys.

Tow home: $55
Spark tester: $20 (needed one anyway)
ICM: $30

Rick
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Old Nov 7, 2015 | 02:58 PM
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Old Nov 11, 2015 | 02:43 PM
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Congrats on finding/fixing the issue...

FYI, I use a timing light on #1 while cranking to test for "spark"; the light then serves two purposes.
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Old Nov 11, 2015 | 04:00 PM
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Originally Posted by shootnstarz
Took a crap shoot and bought a new ICM, installed it and the engine didn't turn a millisecond before it fired right up. Man if feels good to do your own repairs, thanks for the input guys. Tow home: $55 Spark tester: $20 (needed one anyway) ICM: $30 Rick
That's got to be the cheapest tow bill I've ever seen! Congrats on getting her running again.
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Old Nov 13, 2015 | 09:41 AM
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Originally Posted by Dt86
That's got to be the cheapest tow bill I've ever seen! Congrats on getting her running again.
It would have been worth more if I hadn't had to listen to the driver's marital problems all the way home.

As an ongoing saga Monday morning I made a quick errand and the next time I tried to start it, it wouldn't. Again no spark.

Took the ICM back out and to the parts store to be tested. The girl hooked it up and it got blazing hot in seconds so she swapped it out.

Also mentioned the melted coil wire insulation and she swapped it out too, lifetime warranty !!

I'm not sure the coil wasn't frying the ICM. It had a lot of fine, rust colored powder all inside it's cavity and it was only a year old. All back together and running great so far.

Rick
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Old Nov 13, 2015 | 09:44 AM
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did you use the proper thermal grease?
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Old Nov 13, 2015 | 09:52 AM
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bazinga. thnx for reporting back.

Originally Posted by shootnstarz
It would have been worth more if I hadn't had to listen to the driver's marital problems all the way home.

As an ongoing saga Monday morning I made a quick errand and the next time I tried to start it, it wouldn't. Again no spark.

Took the ICM back out and to the parts store to be tested. The girl hooked it up and it got blazing hot in seconds so she swapped it out.

Also mentioned the melted coil wire insulation and she swapped it out too, lifetime warranty !!

I'm not sure the coil wasn't frying the ICM. It had a lot of fine, rust colored powder all inside it's cavity and it was only a year old. All back together and running great so far.

Rick
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Old Nov 13, 2015 | 10:17 AM
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Originally Posted by antfarmer2
did you use the proper thermal grease?


Love it when they run again and you fixed it Good job.
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Old Nov 13, 2015 | 10:37 AM
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Originally Posted by antfarmer2
did you use the proper thermal grease?
You bet'ya !!! Also cleaned everything I took apart, as I always do.

Rick
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To It Just Quit

Old Nov 13, 2015 | 11:24 AM
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Originally Posted by shootnstarz
You bet'ya !!! Also cleaned everything I took apart, as I always do.

Rick
GOOD JOB!!!!!!!!
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Old Nov 15, 2015 | 01:45 PM
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Originally Posted by shootnstarz
Took a crap shoot and bought a new ICM, installed it and the engine didn't turn a millisecond before it fired right up.

Man if feels good to do your own repairs, thanks for the input guys.

Tow home: $55
Spark tester: $20 (needed one anyway)
ICM: $30

Rick


Funny i was looking at spark testers last weekend and bought the wrong one. I realize the spark lighted ones tell u if the spark plug is firing. So of course i bought the non-lighted tester - the kind that clips to ground and just makes its own spark. U need to ground through the plug to verify the plug works to. I guess this helps more for rough running than complete failure though.

Thx for posting.
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Old Nov 16, 2015 | 08:03 AM
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Originally Posted by cardo0
Funny i was looking at spark testers last weekend and bought the wrong one. I realize the spark lighted ones tell u if the spark plug is firing. So of course i bought the non-lighted tester - the kind that clips to ground and just makes its own spark. U need to ground through the plug to verify the plug works to. I guess this helps more for rough running than complete failure though.

Thx for posting.
I looked at the cheaper ones too, they just didn't look all that great. I've needed one for a while, mostly for my small engine crap that constantly seems to not want to run.

So far everything's still working great. I amazed just how smooth the engine is, runs great.

Rick

Last edited by shootnstarz; Nov 16, 2015 at 08:05 AM.
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