LT-1 problems

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Apr 20, 2009 | 08:10 AM

Sliding

Thread Starter

Drifting

Joined: Jun 2001

Posts: 1,625

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From: Zagreb, Croatia

LT-1 problems

A friend of mine drives '92 LT1 and he has some problems.
Engine starts normally when cold and when it warms up, it
starts to missfire until it completely stalls.

He told me that spark plgs and wires are new. What could be
the problem? Opti-spark?

Apr 20, 2009 | 08:57 AM

byedan

Racer

Joined: Jul 2006

Posts: 327

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From: Trenton Ga

control module behind the coil

Apr 20, 2009 | 09:02 AM

corvette-pilot

Le Mans Master

Joined: Sep 2002

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From: Hanger 18 Taxachusetts

That was how mine acted when the water pump peed on my opti. Changed both and runs great now

knock on wood

Apr 20, 2009 | 09:59 AM

jaa1992

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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps

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St. Jude Donor '12

Is he getting any codes?

No codes - probably the ICM and/or the coil. Happened to me!
If he replaces the ICM, don't forget the thernal paste!

Codes - trouble shoot the codes first. Could be the opti, could be a sensor.

Apr 20, 2009 | 09:59 AM

H P Bushrod

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From: Maryville Tn

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St. Jude Donor '09 thru '23

NCM Sinkhole Donor

I'd check the ignition control module first. Easy to get to and a lot cheaper than an Opti.

Apr 20, 2009 | 10:29 AM

Sliding

Thread Starter

Drifting

Joined: Jun 2001

Posts: 1,625

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From: Zagreb, Croatia

Thanks guys. I'll tell him to check for the codes first, and go from there.

Apr 20, 2009 | 12:47 PM

Epimax

Burning Brakes

Joined: Dec 2007

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Quote:

Originally Posted by jaa1992

Apr 20, 2009 | 12:47 PM

onedef92

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Joined: Oct 2000

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From: Fort Knox, KY

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Quote:

Originally Posted by H P Bushrod

I'd check the ignition control module first. Easy to get to and a lot cheaper than an Opti.

Check the coil and ignition control module (ICM). My coil went ****-up on me and took my ICM with it, resulting in an immediate crank, no-start condition.

Replaced both and it fired right up and ran like new money.

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Apr 21, 2009 | 10:50 AM

pcolt94

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Joined: Jan 2006

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From: Orlando FL

My first thought would be the ICM. It does not sound like an typical opti problem. But I would also not forget about a possible ECM problem.
They do cause some unusual problems.

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