09-15-2007, 06:05 PM
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up in smoke
I have an 81' Z28, 383 stroker. last week when I parked it it was running fine. This weekend when I started it I had lots of black carbon smoke and ran like crap. I thought it was the carb- changed it. Also changed plugs...still running like crap, any suggestions?
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09-16-2007, 07:37 PM
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double check the timing. are you using a Holley? mite have a float stuck or is set to high and is flooding out the engine. and have you had a backfire through the carb? then the power valve is shot and that is making it rich running. and also check the fuel pressure. you only need about 6lbs of pressure.
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09-17-2007, 08:58 AM
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timing was checked. i thought it might be the carb so i got a new 750 holley. changed the plugs, checked fuel pressure right around 6 . it seems to be running a bit better but not all that good. do you think it might be a stuck valve.
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09-18-2007, 07:55 AM
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valves r the answer.
check if the cadyliac (Sp?) convertor aint clogged , that could cause smoking.
__________________
<--Nick-->  1984 Camaro Z28 5.7 -Sold Will be missed forever December 7 2007 2005 Suzuki GSX-R 600 Full Yoshimura exhaust. 1998 Camaro SS El Es Uno M6 BBK intake manifold/bbk throttlebody, smooth bellow, SLp lid, slp cold air kit, Edelbrock headers/hooker muffler, 243 z06 heads, ms3 cam, still with a crappy tune,waiting to get dyno'd.
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09-23-2007, 03:49 AM
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i take it there is no EGR valve that may be stuck open. have you checked for a vaccum leak?? when you set the valves, did you go zero lash and a 1/4 turn more?? just a thought. valves mite be to tight.
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09-23-2007, 04:57 AM
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Quote:
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CamaroQueen is a sweet lady and Warthog is a cool dude! imports need turbos like old men need viagra, cause without it you couldnt perform Quote:
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10-03-2007, 05:55 PM
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Black smoke is normally an over rich mixture. Too much fuel in relation to air. You said you changed the carb, was it a new one?
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Present car: 95Z & 68 SS Camaro. Both almost "STOCK" with some mods. 
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10-09-2007, 05:17 AM
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what type of ignition are you using? the coil mite be going bad and is not sending enough voltage to the plugs. are you using a AC Delco plugs? R44ts at .040-.045 gap is a good choice and cheap till you figure the problem out.
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