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Need the firing order for a 1990 C5 Corvette, L98

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1-8-4-3-6-5-7-2

Posted on Sep 02, 2010

Testimonial: "Very fast response, and just what I needed."

  • lisaw417 Sep 02, 2010

    Awesome! Thank you!! :)

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I have a 1986 monte carlo with a 1990 corvette engine when starting cold it will stall after just a few seconds. i can get it to stay running by reving it high for 15 to 20 seconds but i have alot of...


i would check the fuel injectors to see if 1 of them isn't bad, i had a 1989 corvette with a L98 engine, and it would start up, run a few seconds , then die, then , when i would try to re start it . sometimes it would, and sometimes it wouldn't, i would have to let it set for a short while, but after i diagnosed the fuel injectors , i found out that the # 6 injector on my engine , was bad, i replaced it, and it ran fine aftewards, also , you can check the throttle positioning sensor, hope that this information has helped you.

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897ede0.jpgGreat Car!

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Change plugs and wire and engine will not acclerate. This is a built 350 short block chevy with pro charger.


350 Chevy engine in what? 1990 Corvette? Who built it, did you?

Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2

Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.

Distributorless Ignition System:
VIEWING the engine from the Front of the car.

Spark plug wire connections along the back, starting from Left side going to Right side;
2-3-7-4

Spark plug wire connection towards the Front of the engine;
6-1-5-8

(To guess I would say you have 5 and 7 wires switched)

Left side cylinder order is 1-3-5-7, going from front to back.
Drivers side is Left side.
Right side cylinder order is 2-4-6-8, going from front to back.

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1 Answer

Clutch knock at shut down


THROW OUT BEARING IS MAKING THE KNOCK NOISE , I AM REPAIRING A 1991 L98 CONV. RIGHT NOW FOR THE SAME ISSUE!

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