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Topic: 94 C4 no spark

in Forum: C4 Engines

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94 C4 no spark (1/8)
6/21/14 8:45pm

Spitfire0_2
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Angier, NC - USA

Vette(s):
1989 Coupe 1994 Coupe

Joined: 6/18/2014
Posts: 2

I am having a problem with my 94 C4 LT1, I checked for spark and have none what should I check next? Will appreciate any help.

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Re: 94 C4 no spark (2/8)
7/1/14 9:18am

rtslt4
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Huntington Station, NY - USA

Vette(s):
1996 Black Cpe., Lt. Beige Int., LT4, 6 Spd., Corsa Exh., K & N, & Chrome Replc. Wheels.

Joined: 7/2/2013
Posts: 51

Check to see if the coil works.

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Rts-LT4

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Re: 94 C4 no spark (3/8)
7/2/14 9:08am

Black Shark
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Vette(s):
Black 1979 L-82 Black 1996 LT1 Black 1999 Coupe

Joined: 3/20/2009
Posts: 611

check---ICM---ignition control module....its on the passenger side head, one front of motor.

good luck

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Re: 94 C4 no spark (4/8)
7/8/14 2:28pm

TLAVAC
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beaufort, SC - USA

Vette(s):
1990 Turquoise Corvette (his) & 1990 Turquoise Corvette (hers)indy festiville car for sale

Joined: 9/1/2009
Posts: 37

its probably the opti spark.the coils rarely ever go bad.from experience with my buick lt1,had same problem,changed coil,no help.opti spark fixed it.ck a gm mech and he will give you the same advice.

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Re: 94 C4 no spark (5/8)
7/10/14 11:06am

Spitfire0_2
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Angier, NC - USA

Vette(s):
1989 Coupe 1994 Coupe

Joined: 6/18/2014
Posts: 2

Thanks for the advice,men. I changed the Opti Spark, the old one was badly corroded. Still no spark, though. Had the ICM tested at a local parts store, it checked bad. Can't wait to get it together, believe it will run now.

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Re: 94 C4 no spark (6/8)
7/22/14 12:09pm

Adam Wartell
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Eagleville, PA - USA

Vette(s):
1979 Corvette Red T-Top

Joined: 3/18/2009
Posts: 4807

How did you make out with this? Did you get it running? What was the cause?

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Re: 94 C4 no spark (7/8)
7/30/14 2:51pm

FLDAVE
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Vette(s):
1953 1992 BLACK ON BLACK

Joined: 11/22/2009
Posts: 60

Did you try looking at any stored codes thru the CCM (Central Control Modual)? The CCM will look at all the codes even the ECM (Engine Control Modual). On the pre OBD II you jumper between A and G on the diagnostic port connector. On OBD II there different. Maybe someone could chime in with the terminal jumper no.'s. No need to buy a scan tool.

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Re: 94 C4 no spark (8/8)
7/30/14 2:55pm

FLDAVE
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Vette(s):
1953 1992 BLACK ON BLACK

Joined: 11/22/2009
Posts: 60

Oh, oh. I found it. Jumper between 4 and 12. It's called the ALDL it' s located just above the drivers knee.

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