You are here:

Chevrolet Repair/Chevy Blazer

Advertisement


Question
I have a 1995 chevy blazer that is having some backfiring issues. It starts out running fine after you turn it over but after about 10 seconds it backfires once then twice and then it starts sounding like an automatic rifle shooting. Do you have any idea what could be causing this?

Answer
HI FRANK,,WELL 90 % OF BACK FIRE ISSUES ARE USUALLY CAUSED BY BAD IGNITION COMPONENTS. SUCH AS CRACKED DIST-CAP,CROSSED SPARK PLUG WIRES..I WOULD REMOVE THE DIST-CAP AND LOOK AT THE TOWERS ON THE UNDERSIDE TO SEE IF THEY ARE CRACKED OR ANY CROSSFIRE BETWEEN THE TOWERS..IF THE IGN SYSTEM LOOKS GOOD THE NEXT IS A INTERNAL PROBLEM SUCH AS VALVES NOT OPENING ALL THE WAY. HOWEVER IF THE BACK-FIRE IS ONLY IN THE EXHAUST I WOULD THINK IT IS IN THE IGN SYSTEM..BACFIRE UP THROUGH THE INTAKE IS VALVES NOT OPENING AS THEY SHOULD. POSS CAUSES ARE BENT PUSHRODS, BAD CAM SHAFT,COLLAPSED LIFTERS...TAKE THE AIR CLEANER DUCT WORK OFF AND GIVE IT SOME GAS LIKE THIS,IF THE BACK FIRE IS UP THROUGH THE THROTTLE BODY I THINK YOU HAVE GOT SOME VALVES THAT ARE NOT OPENING.. THIS WILL CAUSE A POP POP POP POP SOUND,ESPECIALLY UNDER LOAD..LET ME KNOW HOW YOU MAKE OUT GOOD LUCK TO YOU,,,TOM...

Chevrolet Repair

All Answers


Answers by Expert:


Ask Experts

Volunteer


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.

©2016 About.com. All rights reserved.