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#1
08-11-2004, 09:45 PM
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Spark Plugs
I have a 1983 Suburban 2 wheel drive
The plugs always blacken and hve to change every 3 to 4 days so the Surb can run How do I adjust to carb or what can I do?? 
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#2
08-12-2004, 01:51 PM
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 So, hows the gas mileage? does it seem to be using more than usual? How long have you had the truck? Might be due for a carb rebuild.
__________________
93 Suburban 2500 203,000 miles on engine still running like a champ! Tranny rebuilt at 197,000 My Daughter calls it the bus, and sits in the third row seat praying for potholes and speedbumps!  Just Horsin' Around Equine Services http://www.JHA-Trans.com
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#4
08-17-2004, 06:00 PM
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Re: Spark Plugs
Quote:
I do use Champion plugs doesn't seem to help I rebuilt the carb some time ago and uses half the gas after rebuilding
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#5
08-17-2004, 09:43 PM
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Re: Spark Plugs
Something to think about doing....get rid of your stock Quadrajet carb, and get an aftermarket Edelbrock Q-Jet replacement. Don't get me wrong the Q-Jet is a well designed carb, though I know many would disagree with me. The problem with a lot of Q-Jet carbs these days are that they are simply WORN OUT. The throttle shafts leak air because of simple wear and tear. The solution would be to have it re-bushed with teflon seals, but you may not find someone to do that for a resonable amount of money. Because of this wear and tear, and the carbs lack of ability to meter fuel properly as when new, they tend to make the engine run rich, causing your blackened plugs. I would seriously suggest buying a NEW carb. Not bigger per se, just a stock replacement. If you like your truck that much, a $300 investment in a new carb would be money well spent. Hope this helps. -Chris
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#6
08-17-2004, 09:48 PM
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Re: Spark Plugs
Forgot something, if your on your orginal motor, it would also be a wise move to replace your valve stem seals. You can replace them while on the vehicle using a adaptor to fill the cylinder with compressed air, holding the valves in place. It's tedious, but your sooty plugs could also be from the valve stem seals leaking oil into the cylinder during the intake valve opening. Vacuum is present and the vacuum pulls oil through the area between the valve and the valve guide. Good Luck!
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