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Black smoke from exhaust, idling rough, won't stay running, can't restart

I think I may have water in my fuel from a recent fill up. Truck just started shutting off very frequently while driving. I was able to start it back up rather easily on day one. When it would start back up it would initially idle very rough, shutt off, start back up and idle fine. This happened about 15-20 times on day one. At the first stall out I added water remover and fuel system cleaner simultaneously. At the end of day one the vehicle would not restart, not due to battery power, just fuel issue still. It took about 4 hours on day two to restart the vehicle after having added 3 gallons of premium gas the night before at the last stall out and more water remover. I also cleaned the mass air flow sensor at this point. When the engine finally restarted and warmed up I revved it to about 4k rpm and a big black cloud blew from the exhaust. The engine idled smoothly at this point but at about 1k rpm for a extended time and not the normal 700 - 750 rpm. About 10 miles later everything was back to normal. 50 miles later the truck died out and I can't restart it to the point where it will idle smoothly and not bellow black smoke.

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  • Jeff Hammack
    Jeff Hammack May 11, 2010

    Do you have a check engine light? sounds like you are having trouble with the MAP and or MAS sensor. Unless you know for certain that you have gotten water in fuel, I wouldn't put in any more water remover or fuel system cleaner, the cleaner if used to often will actually clog the injectors. Also you need to check for vacuum leaks before and after the MAS sensor, this will cause false reading to the computer. Your engine is overfueling.

  • Curt Downs May 11, 2010

    Has your check engine light gone on? I would scan for codes stored in the cars computer even if the light didn't go on to see if there are any clues to the problem there. I think this is more than a fuel problem.



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sounds like you have a very dirty mass air flow meter. invest in a new one and be sure to clean the throttle body with an appropriate cleaner and tooth brush.

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the gas cap can make your check engine light come on do to not enough vaccum in the take for your evap system and it could cause the vehicle to run a little funny. but highly unlikly this is your problem.if there are no trouble codes or no check engine light this could be very hard to diagnose on-line you may want to take it to a respectable mechanic and have them run an on board diagnostic test on it

Posted on Dec 30, 2009

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