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Jan 9, 2026 | 05:45 PM

brokenstud

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going nutz

I have a 2002 silverado , we dropped a gen4 ls in with BTR turbo stage 2 cam, sheet metal intake , 92 mm throttle body, 70 lb injector, evil energy fuel system, dragon fire coils, lingenfelter box, 78 mm turbo everthing says it is communicating we have plenty of fuel , timing is right good grounds, 12 volt to coils but NO SPARK at all . at my wits end need help

Jan 9, 2026 | 08:57 PM

Che70velle

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From: Dawsonville Ga.

Quote:

Originally Posted by brokenstud

Had the same issue once with an LS swap. Turned out for me, that I had a harness with the MAP sensor wires flipped around at the sensor plug. Bought it that way. I fiddled with it for a week and then had a tuner come to the shop and put a laptop on it with HPTuners. He found after about 20 minutes of trying stuff that he had no MAP signal. He left and I started ohming wires for the MAP circuit, only then to find the mis-pinning. I flipped 2 wires around and it fired up immediately. Not saying that’s for certain your issue, but after you’ve tried everything that makes sense, look at the improbables. I know yours isn’t a “swap” but I’ve heard of the Lingerfelter box crapping out before.

Jan 14, 2026 | 06:37 AM

02EBC5Z06

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From: Massillon, OH

You said it is a Gen 4 engine in a Gen 3 truck... What computer are you running and if it is the stock Gen 3 computer, did you change the reluctor wheel on the crank to a 24x? Or is the 58x still on the crank?

Jan 14, 2026 | 06:38 AM