Chevrolet Repair/1991 s-10

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Question
I have a 91' S-10 and I was driving down the road and it felt like i was running out of fuel. i pulled into the gas station and filled. started the engine and it continued to run the same way. as i was trying to accelerate i found that when the throttle was depressed that the engine would cut out and when i would let up off of the throttle the engine would speed up almost like it is working backwards. If i unplug the map sensor vacuum hose the engine will run for a little bit and die. If i keep the engine idle up then it will keep running. there is also a bad smell of fuel when the engine is running. any input would be greatly appreciated. i am mechanically inclined but work on diesel engines and have never dug into the vacuum system on a gas engine before.

Answer
GOOD DAY CURTIS,THE WAY YOU ARE DESCRIBING THIS, IT IS A FUEL STARVATION PROBLEM. LET OFF THE THROTTLE THE ENG PICKS UP !! YOU SAY YOU SMELL FUEL !!!I WOULD BE LOOKING INTO WHERE THE FUEL LEAK IS AND REPAIR THIS. ONCE YOU START TO LOOSE PRESSURE THIS WILL ACT LIKE IT IS..WHEN YOU PULL THE MAP SENSOR OFF IT WILL ONLY RUN FOR A FEW SECONDS OR MAYBE LONGER AND DIE ,,BUT THIS IS NORMAL. THIS HAS THE CLASSIC SYMPTOMS OF LOW FUEL PRESSURE..REPAIR THE LEAK AND THIS SHOULD TAKE CARE OF IT FOR YOU...IF NOT YOU WILL NEED TO REPLACE THE FUEL FILTER AND THEN CK FUEL PRESSURE. IF LOW, TIME FOR A NEW PUMP..PRESSURE SHOULD BE AROUND 35 TO 40 LBS AT IDLE..LET ME KNOW HOW THIS GOES FOR YOU AND GOOD LUCK,,,, TOM

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TOM SHEETS

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PLEASE READ ALL OF THIS BEFORE ASKING ANY QUESTIONS. IF THIS CHEVY SECTION IS MAXED OUT.YOU CAN REACH ME IN THE OLDS/BUICK SECTION. Will answer questions from 6:00am to 10:00pm all days [EST][[[ NO DIESEL OR PAINT QUESTIONS]]] will answer all 1965 to present QUESTIONS ON ALL GM'S on mechanics of these cars. Keep in mind i am not there in person i am going on what you are telling me !! PLEASE IF ASKING A QUESTION GIVE ME AS MUCH INFO AS POSSIBLE. THE MORE THE BETTER. SUCH AS YEAR,MAKE,MODEL,ENGINE SIZE. THIS WILL HELP ME HELP YOU. I will not be able to answer all questions because of some situations that i would really need to be there and see things for myself,such as electrical issues. In many cases i would need wiring diagrams. I can also give you an estimate on what the cost would be at our repair shop as an idea to help you. Keep in mind that my answer is ONLY MY ADVICE,ck with your mechanic as well.. >> THANK YOU, TOM..

Experience

I have been a ASE certified master mechanic for over 30 years and certified IN ALL 8 CATEGORIES,[engine repair,engine performance,auto trans,manual trans,clutches,steering and suspension,brakes,electrical systems,heating and air/cond. I am also a state CERTIFIED inspector for over 30 years. I do computer work [pcm]fault codes,pcm flashing,state inspection monitor readiness,repairs on exhaust,fuel service,[injection and carburetor,] charging system problems, running issues,alignments,frame problems,tire balance,struts and of course standard and anti-lock brakes.

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nys state auto repair industry and ase group.

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high school,4 years of tech school,and many many hours of auto training with many gm classes and aftermarket training classes..

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ASE MASTER TECH CERTIFIED IN ALL 8 CATEGORIES.NYS INSP LICENSE AND A/C CERTIFIED

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