Question about GMC S-15

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Start the truck it starts but have hold the throttle to the floor to keep it running and it blows black smoke. a1989 gmc s15 with 2.5l engine

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When was last tune up? Plugs, wires, ALL filters & fluids??? Especially fuel filter. I'd start there and run a good fuel system cleaner through it.

Posted on Mar 20, 2011

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Posted on Jan 02, 2017

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Truck starts but only chuggs and blows out black gas smoke as engine lite flashes no throttle response


black smoke is too much fuel
check for leaking injector and injector seals
check for excessive fuel pressure
run the fault codes as you will have some from the engine light on

Jul 02, 2015 | Cars & Trucks

2 Answers

2004 GMC YUKON DENALI idling rough and trouble starting


unless you want to blow up the intake stop giving it gas before you turn it over what you are doing is dangerous all you are doing is dumping raw unburned gas into the bottom of the intake to the motor, one of these times you go to start it it will do this boom really loud then die, it will lift the whole back end of the vehicle off the ground, then if you try to start it again okay I edited the answer also could be your catalytic convertor plugged is the exhaust coming out good, change the sensors whatever you do stop pumping the gas if it wont start now get in as you need silence so shut the door and the radio off can you hear the fuel pump? it will sound like a huum for a few seconds if you cant there is your problem all I can say is stop pumping the gas as that's why its running bad you are burning out the sensors and all the computer code stuff and wasting expensive gas too. you prolly fouled your plugs as well.

Mar 07, 2017 | GMC Yukon Denali Cars & Trucks

1 Answer

High to low rpms


There may be a problem with the idle air control circuit. Make sure that the throttle body and idle air passages are clean. If not, you may have to do a throttle body cleaning on it. You can follow the directions on the can, but you will have to make sure that you give it a few shots with the throttle plate closed, so that the cleaner can get into the idle air passages. Also, make sure that there are no vacuum leaks and there is not any un-metered air that is entering into the intake. If the exhaust is blowing out and blue smoke, then the piston rings may be worn or stuck and the combustion chamber all carbon built up. If it blows out black smoke, then it's running too rich.

Jul 05, 2013 | Cars & Trucks

1 Answer

91 944 3.0 acts like it flooded when starting then clears up and runs fine


Hello there
Check your cold start valve(injector) it is probably leaking
proporsche

Feb 17, 2013 | 1991 Porsche 944

2 Answers

Wont start


simpler that exposing the throttle body just depress the accelerator 3/4 and try to start.

If like before, the vehicle starts... watch the rear view mirror for black smoke

both indicates a leaking injector(s)

Mar 16, 2010 | 1998 GMC Sierra

2 Answers

Will not start and run. blows black smoke while


The pressure regulator is most likely the problem,but have the codes read to make sure.

Feb 26, 2010 | 1993 Buick Park Avenue

1 Answer

Sometimes will not start,fuel pres good


It sounds like it`s choking to much what i mean is it`s not getting the air intake it needs is it loosing horse power a little ? here's something you can try because it sounds like the intake manifold is clogging . After getting it start gently pour some carb cleaner directly into the intake on throttle body be careful not to pour to fast the engine will stall hold the idle up to at least 1500 rpm slowly empty all of container keep idle up for just about a minute then gently let off it if it goes to die hold it up a little bit longer once it holds it`s own idle let it idle for about 10 minutes on it`s own NOTE it will smoke like crazy out the exhaust but don`t worry it will stop that in time once it seems to have settled down on smoke take for drive know i can`t tell you to go blow the cob webs out of it because you would have to speed and i would not want to have suggested to you do that. Hope this helps

Sep 23, 2009 | 2003 Saturn VUE

2 Answers

98 saturn it won't start when the engine is cold i have to put the gas peddle to the floor while I turn the key till it starts. when it does start I get large cloud of blue smoke. once the engine is warm...


Replace The Throttle Positioning Sensor...When you put Accelerator to the floor ... It rolls the Position Sensor Cam to tell computer etc to put Injectors Etc..into cold start mode...as soon as the motor fires..injectors take over and do their job..The Black smoke is the Extra Gas Put it cylinders to Purge it in a cold Start Mode...Throttle Positioning Sensor..and Yes You Can do It.!!! AutoZone-O'Reillys Etc..Easy Fix !! And Remember Castrol GTX-5-30/ 10-30 !!!
For God Sakes DO NOT Run 5-20 Or 20-50 Tooo Thin- Tooo Thick !! -Thanks-Matthew

Mar 19, 2009 | 1998 Saturn SL

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