1985 vette
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8th Gear
Joined: Feb 2007
Posts: 8
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1985 vette
i have a 85 vette that smokes from # 4,6, & ,8 WORSE WHEN THE MOTOR IS COLD.i SET ALL THE PLUGS AT .0045 I KNOW .0035 IS RECOMMEND.MY QUESTON IS CAN I PUT A DIFFERENT PLUG IN THE #' 4,6,AND 8. OR MAYBE CHANGE THE GAP. ANY HELP WOULD BE APPRICATED. THANKS,BOB
Last edited by robertmax; Feb 10, 2007 at 12:06 PM. Reason: MISSPELLED WORD
Le Mans Master
Joined: Oct 2003
Posts: 6,130
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From: seattle WA
What color smoke, it could be the valve seals which is common, possibly a head gasket. Does the smoke show up on each start up? or does it get better after the engine has warmed up.Typically valve seals cause smoke on the start up. If I were you I'd make sure I don't have any coolant in the oil and if not I'd probably do a compression test. I really don't think going to a different plug will help.What did the old plugs look like?
Le Mans Master
Joined: Sep 2006
Posts: 6,050
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From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
smoke
how do you know it's 4,6,+8? don't you have a Y pipe and a single cat?
If the plugs are fouled, you probbly need new plug wires unless you have 225,000 miles.
If the plugs are fouled, you probbly need new plug wires unless you have 225,000 miles.
Race Director
Joined: Jun 2005
Posts: 17,640
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From: Lenoir City TN
St. Jude Donor '08-'09-'10-'11
Please tell us what color smoke, what about #2 since it seems the one side is giving problems, check to see if the injectors are leaking on those cylinders as well. Do the checks as mentioned above as well.
Le Mans Master
Joined: Feb 2006
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From: Louisiana
Need more info.
Le Mans Master
Joined: Jun 2006
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From: One day you're a Comet...the next day you're dust... Arkansas
I don't think you can fix an engine problem by messing around with plug gap or heat range. At least I've never heard of that working. I would have a shop look at it if you aren't sure of what's happening.
Race Director
Joined: Feb 1999
Posts: 12,772
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From: Indianapolis IN
What color smoke, it could be the valve seals which is common, possibly a head gasket. Does the smoke show up on each start up? or does it get better after the engine has warmed up.Typically valve seals cause smoke on the start up. If I were you I'd make sure I don't have any coolant in the oil and if not I'd probably do a compression test. I really don't think going to a different plug will help.What did the old plugs look like?
Valve seals depending on the color of the smoke.
