I have just bought a 95 blazer with the 4.3 vortec engine. When I drive it for more than say 8 or 10 miles it acts like the timing has jumped, it will idle really rough and stall out when in try to take off from a stop. I have replaced the egr, and ALL the little black boxes on top of the intake, I can't think of all their names lol. I have even put a new fuel regulator on the spider injection. I'm hoping it's not the Injectors, I can't afford that..... And last night I drove around for a while and when I get back I turned it off and tried not start it back and it clicked like if the battery cable was loose but it was tight. Do you think all my problems could be from a bad ground somewhere?
Answer HI CHARLIE,,WELL IT IS POSSIBLE THAT YOU ARE LOOSING BATTERY VOLTAGE CAUSING THE POOR RUNNING CONDITIONS. YOU WILL NEED TO START OUT AT FIRST BASE, FIND THE CAUSE OF THE LOW BATTERY IF IT IS LOW OR A BAD CONNECTION AT THE BATTERY POST. REMOVE THE CABLES AND CLEAN IF NEED BE AND RE-CONNECT THEM..NOW GET A VOLT METER AND CK FOR 12 VOLTS AT THE BATTERY,IF OVER 12 VOLTS SEE IF IT WILL START. IF NOT, MORE THEN LIKELY WILL NEED TO BE JUMPED OR CHARGED. CAN YOU DO THIS ???
ONCE ENG IS RUNNING HOOK THAT VOLT METER UP AGAIN AND MAKE SURE THE VOLTAGE IS 13.8 TO 14.5 VOLTS OR IN THIS AREA WHILE RUNNING WITH THE LIGHTS ON,HOLD THE RPM AROUND 1500 OR SO TO CK THE ALT OUTPUT..IF THIS IS NOT CHARGING TO THE ABOVE SPECS LIKE LETS SAY LOW VOLTAGE UNDER 13 VOLTS THE ALT IS NO GOOD. BUT LETS SAY IT IS CHARGING GOOD. THEN YOU MAY HAVE A WEAK BATTERY WHICH SHOULD BE TESTED AT A SHOP OR PARTS STORE..HOWEVER IF THE BATTERY IS WEAK THIS WILL NOT CAUSE YOUR PROBLEM WITH POOR RUNNING, [[ONLY A LOW CHARGING ALTERNATOR WILL CAUSE THIS]].THIS IS IMPORTANT..OK SO LETS SAY CHARGING SYSTEM IS GOOD NOW AND BATTERY IS GOOD, BUT THE ENG IS STILL RUNNING POORLY. THE WAY YOU HAVE EXPLAINED THE PROBLEM IT COULD BE A BAD MASS AIR FLOW SENSOR..REMOVE THE WIRE CONNECTION TO IT AND SEE IF IT RUNS BETTER...[[[BETTER NOT PERFECT]]]IF IT RUNS BETTER MORE THEN LIKELY THE MASS AIR FLOW IS FAULTY. IF THIS HAPPENS ONLY WHEN IT GETS WARMED UP THE SECOND PROBLEM COULD BE A BAD IGN MODULE OR MAIN COIL..WHEN IT STALLS OUT I WILL ASSUME IT WILL START BACK UP..THE COIL ON THE INTAKE COULD CAUSE THIS [WEAK SPARK] WHEN HOT..THIS SHOULD KEEP YOU BUSY FOR AWHILE LET ME KNOW HOW YOU MAKE OUT AND GET BACK TO ME ON WHAT YOU HAVE OR HAVE NOT FOUND...GOOD LUCK,,,TOM...
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..
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.
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.