Lean and or too hot plug - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-16-2009, 11:16 PM   #1
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Default Lean and or too hot plug

SO I took my plugs out because I'm getting misfires through out my engine under hard acceleration at the high RPM'*. And they are cook here are the pictures. When I replaced the plugs about 5 months ago this is how the ones looked taking them out. Now I had a bad fuel pump at the time pushing low psi. I haven't check my psi since then need a gauge. So is it I'm lean or I need colder plugs? Thanks for you input.



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Old 07-16-2009, 11:25 PM   #2
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Those plugs look about right. Brown to grayish tan is what you want to see. White insulator firing tip and/or excessive electrode erosion indicates a lean condition,
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Old 07-16-2009, 11:32 PM   #3
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I see. Just looked like the isolator was a bit blistered too. and the whole thing looks like it'* dipped in baking flour. SO another place to find out why I'm misfiring
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Old 07-16-2009, 11:34 PM   #4
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Old 07-16-2009, 11:39 PM   #5
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Plugs are brandy new but I should test my coils with my meter. Did the take off spark test with bill looked strong.
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