94 vette with 47000miles. car runs rich and has a slight miss through the exhaust. new opti spark, plugs, wires just installed. gets about 15mpg around town. exhaust tips are full of carbon. mechanic says no codes and vehicle is fine. says vehicle needs to be driven. vehicle runs fine except for this. im not convinced all is well. steve
My 2014 as camero has black smoke on tail pipes what cause this to happen
I HAD THE SAME PROBLEM IN MY 94 VETTE, CHANGED THE O2 SENSOR ON THE DRIVERS SIDE AND ALL THE PROBLEMS WENT AWAY, GIVE IT A SHOT.
Check intake manifold for leaks and also inspect all vacuum hoses also may be good idea to replace opti spark ignition module its located on the coil mounting bracket at front of right cylinder head if its been exposed to water , antifreeze, or moisture it can effect ur cars timing
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1992 LT-1 and have had this problem since replacing Optispark, wires, plugs, new lifters, injectors, pretty much the "whole nine yards". Ran everything through that I could with no fix. The guy at Just Corvettes recommended replacing the cats and sensors. I am witing on the cats right now.
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