C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

What would cause this rich condition?

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Old Jul 9, 2004 | 07:14 PM
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From: Tempe AZ
Default What would cause this rich condition?

Finally got my 85 running nicely by simply cleaning out the throttle body, but whenever I trounce on the gas, my buddies always tell me I get a cloud of black smoke. So of course its running rich, but what are some things I look at to try and diagnose it? A ways back, my girlfriend's mom worked at a dealer and looked at it for free, and came up with bad injectors. I would take it back, but the girlfriend is no longer present. If injectors were bad, wouldn't it run like crap? Seems to run pretty strong, and gets 24mpg on the freeway, 18mpg in the city. Fuel pressure regulator maybe? Oh, dunno if its important, but I have the vacuum line going to the EGR sealed off cause the EGR is shot.
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Old Jul 9, 2004 | 07:27 PM
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Have you done a pressure test on the cylinders? I wonder if a head gasket would do this. Could maybe be blow-by on the piston rings too.
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Old Jul 9, 2004 | 07:55 PM
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You can check fuel rail leak down to see if you have leaking injectors and do a static resistance check on each.

If all check out with good resistance send all 9 to Rich at Cruzin Performance (link on my site). He will leak test, recondition and flow test them for around $100 with 48hr shop time.

Also check the condition of your air filter....
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