Question about GMC Sierra
Recently my truck has started blowing black smoke, idleing rough at stop lights and getting poor gas mileage. What would cause this?
If the check engine light is on, you would need to check the computer for trouble codes first.
If the engine is fuel injected, it could be a bad injector. If it has a carb, it could be a sticking choke or an internal leak.
Posted on Apr 30, 2013
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Posted on Jan 02, 2017
I had a 1995 nissan pick up with a similar problem, may want to try cleaning out or replacing the EGR valve.
Posted on Jul 23, 2009
This is what i would try (cheapest first) redexe/wyyns
injector cleaner,double dose,then i have put 1gal gas in 10gal diesel to increase burn temp (you may encounter a hot start problem temporarilly)then if still smoking, get a compresion check on the engine(this will tell you volumes)
by the way the NATO tanks put in 1/3 gas in diesel to stop it freezing in arctic conditions.any more than 1/3 can result in problems.
Posted on Mar 17, 2010
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