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help with repeated spark plug fouled

 
Old 07-08-2019, 12:24 AM
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Richard Cullen
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Default help with repeated spark plug fouled

I have a '84 c-4 lt1 w/ throttle body , hei ignition, I have a problem with the no. 4 spark plug fouling. new plug new wire and same plug fouls with in seconds. help!!!
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Old 07-08-2019, 07:34 AM
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ls777z
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Compression check?
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Old 07-08-2019, 09:55 AM
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John A. Marker
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Assume you mean that the plug is fouled with oil build up. You don't mention blue smoke out the exhaust, so unlikely an ring issue but it could be. Could be a couple of things:

1) Bad valve seal and oil is being sucked past the valve stem
2) Bad/broken intake gasket. More likely the cause.
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Old 07-08-2019, 07:50 PM
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RalfKramden
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could it be a leaking injector? I'm assuming you're getting carbon fouling
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Old 07-09-2019, 04:45 PM
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Hot Rod Roy
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Originally Posted by Richard Cullen View Post
I have a '84 c-4 lt1 w/ throttle body
I'm a little confused. Has the engine been replaced with an LT1 engine, or is it the original L-83? Since you mention "throttle body", I'm guessing it's not the LT1.

Regarding the fouling of your spark plug, is it being fouled by oil (very wet) or by lack of ignition (dry)? Can you post a photo of the plug? If it's fouling "in a few seconds", that's pretty major! It can't be a fuel injector, because the CFI (L-83) shares its two throttle body injectors with all cylinders. I agree, it's time for a compression check.

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Old 07-11-2019, 02:32 PM
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thank you the info was very helpful got me going in the right direction (intake leak)
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Old 07-11-2019, 02:47 PM
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Hot Rod Roy
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An intake leak will cause a fast idle. An intake leak will affect all cylinders. An intake leak wouldn't cause only one spark plug to have a problem.


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