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Chevrolet Repair/vehicle shutting down for no reason

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Question
2004 chevy express 2500 4.8liter engine    have replaced fuel pump and computer heat sensor and fuel pump relays   van may run fine 1-3 days then just dies while driving or idling.  can start van in yard may run a couple minutes then stall and wont restart. i wait awhile then can start right up and run one hour or two days fine then it happens again.   thanks,jeff

Answer
HI JEFF, WELL THE FIRST THING YOU NEED TO DO IS DIAGNOSE IF THERE IS FUEL TO THE FUEL INJ RAIL OR IS THERE SPARK TO THE SPARK PLUGS..ONCE YOU KNOW THIS YOU WILL BE ABLE TO LOOK INTO THIS PORTION OF IT..WITHOUT KNOWING THIS IT IS TRULY A GUESS...SO WHEN THIS HAPPENS PULL A SPARK PLUG WIRE OFF A PLUG AND INSERT A SCREW DRIVER INTO THE END OF THE WIRE AND KEEP THE SCREW DRIVER ABOUT 1/4 INCH FROM A METAL OBJECT..NOW CRANK THE ENG OVER AND SEE IF YOU SEE ANY SPARK, IF THERE IS THEN YOU CAN ASSUME THE IGNITION SYSTEM IS GOOD. IF NOT MAY HAVE BAD MODULE OR BAD CRANK SENSOR..WE WILL GET TO THAT AFTER YOU FIND WHAT IS GOING ON..SO LETS SAY THERE IS SPARK THEN I WOULD HAVE TO SUSPECT NO FUEL....ON TOP OF THE INTAKE YOU WILL FIND AND A TEST PORT[LOOKS LIKE A TIRE VALVE STEM CAP,] REMOVE THE CAP AND WHILE YOU CRANK THE ENG OVER PUSH DOWN THE CK VALVE AND YOU SHOULD HAVE FUEL COMING OUT OF THIS VALVE THE ENTIRE TIME YOU ARE CRANKING THE ENG OVER,NOT JUST THE FIRST SECOND OR SO.THE ENTIRE TIME THE ENG CRANKS..CK THIS OUT AND GET BACK TO ME ON WHAT YOU FIND...TOM

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TOM SHEETS

Expertise

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.

Organizations
nys state auto repair industry and ase group.

Publications
N/A

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

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

Past/Present Clients
MANY CUSTOMERS IN OUR BUSY SHOP.

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