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78 Vette HEI Ignition engine started running rough

Forum: C3 Engines, Driveline and Handling

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Re: 78 Vette HEI Ignition engine started running rough

Posted: 11/1/24 10:52amMessage 11 of 13
L
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Frisco, TX - USA
Joined: 7/22/2022
Posts: 29
Vette(s): 1978 Silver Annivesary L82. Black Interior

I don't have one of those Gary. But I think the timing light should at least give me a clue if one wire is not firing.

It be nice to have a computer that would send codes like we have on our C7's. LOL

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Re: 78 Vette HEI Ignition engine started running rough

Posted: 11/1/24 11:32amMessage 12 of 13
L
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Frisco, TX - USA
Joined: 7/22/2022
Posts: 29
Vette(s): 1978 Silver Annivesary L82. Black Interior

I checked the 8 plug wires and they all show they are firing.

I will let it cool down and check the cap to see if I can see anything.

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Re: 78 Vette HEI Ignition engine started running rough

Posted: 11/1/24 12:37pmMessage 13 of 13
L
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Frisco, TX - USA
Joined: 7/22/2022
Posts: 29
Vette(s): 1978 Silver Annivesary L82. Black Interior

I took a pic of the cap & rotor. A little pitting on the rotor. Not sure it is enough to cause this issue.

 

 

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