Plug-too rich?

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Apr 13, 2019 | 04:34 PM

Boomer880

Thread Starter

Instructor

Joined: Nov 2018

Posts: 193

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From: Chicago

Plug-too rich?

Just pulled one plug out to see what they were running in the car. 1969 with a 427/390hp motor. Running too rich?

Apr 13, 2019 | 05:18 PM

Greg

Just another Corvette guy

Joined: Feb 1999

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From: Palm Springs, CA.

Maybe a good "carbon run" would clean this up?

Apr 13, 2019 | 06:06 PM

OMF

Melting Slicks

Joined: Jul 2006

Posts: 2,285

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From: Salmon Arm, BC

Yeah, too rich it is... but if it was just idling in the driveway for 15 minutes warming up it's a false indication of your jetting.
Take it for a run, bring it home and don't let it idle, then pull the plugs and read.

Last edited by OMF; Apr 13, 2019 at 06:09 PM.

Apr 13, 2019 | 07:23 PM

CanadaGrant

Safety Car

Joined: Apr 2006

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From: BC

I switched my 69 427/390 to ACDelco R45XLS. My R44's looked just like yours. I don't beat on it much as it's still the original motor but sstocker is correct. You have to run it on the road without letting it sit in the driveway idling then check the plugs. You don't have any oil fouling on the plug or even the threads so you could leave them or move up a heat range.

Apr 13, 2019 | 07:23 PM

resdoggie

Had a 1976 L-82, 4-sp

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From: Some days your the dog and some days your the hydrant.

Royal Canadian Navy

May as well throw in a new set of plugs in for what they cost and then do another diagnosis.

Apr 13, 2019 | 09:24 PM