Question about 1994 GMC Sierra

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My truck will only start if I hold the gas to the floor, like its flooded, and it chugs, and blows black smoke out exhaust

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First ,l want to know whether is caburettor type or injection,if carb check your carb float, injection you should get a car scanner read for fault code maybe air mass sensor, coolant temperature sensor or 02 sensor

Posted on Apr 05, 2011

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Sounds like it was flooded. Next time it happens. keep gas pedal all the way to the floor and hold until it fires. water in the gas, or just bad gas can do this. But if you pumped it at all while trying to start it if fuel injected can flood it. Let it sit and try again, or keep gas pedal to ground and hold until starts.

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My truck will only start by holding gas pedal to the floor, like its flooded, and only chugs, blows black smoke out of exhaust


I am having the same problem. I would really appreciate it if you have found a solution to this problem to em me. I have checked the fuel pressure, map sensor, TPS sensor and even tried a new ECM. None of them was the problem. Every once and a while I will get it to start and then after about a minute the idle will speed up and I can tell that it is getting too much gas. Then the times that it won't start I try holding down the gas so that it shuts off the fuel supply and once it begins to fire the injectors begin to just dump way to much gas into the throttle body. Let me know if you have found a solution. It info would be very much appreciated. Chad.McDaniel@paetec.com

Apr 05, 2011 | 1994 GMC Sierra

1 Answer

Have to hold gas pedal to floor to keep car running.wont go over 45 with it floored.and there is blue smoke from exhaust


i would suggest checking into the throttle positions sensor. the smoke makes it sound like the car is flooding.

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Black smoke coming from a 250 GM inline 6 exhaust pipe, then ran rough and now has quit and will not start


you don't say what year, if it has a carburetor it's flooding (Needs a new float) Way too rich

remember this
Blue smoke OIL
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Aug 30, 2009 | 1983 GMC Jimmy

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