No spark
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 16
Likes: 1
Car: 1991 RS
Engine: L03 305
Transmission: 700R4
Axle/Gears: 2.73
No spark
Just changed cap & rotor along with plug wires on my Camaro with a 98 350 Vortec. Has absolutely no spark after having everything assembled. Nothing seems to be coming from coil at all. Was running absolutely fine before I changed them.
Re: No spark
Check the small wires coming from the distributor to the ignition coil, to see if you disturbed any while you were changing the cap & rotor (wires pulled out of connectors, or the connectors unplugged, that sort of thing).
Re: No spark
Make sure you're getting 12V to the coil during cranking.
Can also pull a plug wire off a spark plug and put a loose spark plug in it, then ground the plug body and crank the engine over to verify whether you're getting spark or not.
Can also pull a plug wire off a spark plug and put a loose spark plug in it, then ground the plug body and crank the engine over to verify whether you're getting spark or not.
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 16
Likes: 1
Car: 1991 RS
Engine: L03 305
Transmission: 700R4
Axle/Gears: 2.73
Re: No spark
I’m not seeing anything unhooked. It acts like it’s just magically lost spark. Everything was working perfect before it was removed but now I’m just stumped. Pickup coil maybe? Or ignition module
Joined: Dec 2004
Posts: 16,901
Likes: 1,014
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No spark
What have you tested ? Like mentioned 12v on the pink wire key on and cranking at coil and icm ?
is this tpi, tbi or just hei vacuum advance?
is this tpi, tbi or just hei vacuum advance?
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 16
Likes: 1
Car: 1991 RS
Engine: L03 305
Transmission: 700R4
Axle/Gears: 2.73
Joined: Dec 2004
Posts: 16,901
Likes: 1,014
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Trending Topics
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 16
Likes: 1
Car: 1991 RS
Engine: L03 305
Transmission: 700R4
Axle/Gears: 2.73
Joined: Dec 2004
Posts: 16,901
Likes: 1,014
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No spark
https://easyautodiagnostics.com/gm/4...test-the-icm-1
411 ecm ? Your being very vague on what you even have.
411 ecm ? Your being very vague on what you even have.
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 16
Likes: 1
Car: 1991 RS
Engine: L03 305
Transmission: 700R4
Axle/Gears: 2.73
Re: No spark
https://easyautodiagnostics.com/gm/4...test-the-icm-1
411 ecm ? Your being very vague on what you even have.
411 ecm ? Your being very vague on what you even have.
Joined: Dec 2004
Posts: 16,901
Likes: 1,014
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No spark
sounds like a real cluster F, might find the ecm or pcm identity if then search for appropriate wiring diagrams to diagnose. Efi connection might be able to assist if you have all your information of what components are being used.
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 16
Likes: 1
Car: 1991 RS
Engine: L03 305
Transmission: 700R4
Axle/Gears: 2.73
Re: No spark
oh trust me it is. Previous owner has hacked everything electronically on it. I’ll try and trace and see what I’ll find out and get back.
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