backfiring on 82, any help please
Thread Starter
Pro
Joined: Jul 2005
Posts: 547
Likes: 21
backfiring on 82, any help please
Ok guys I could use some help with this.
the car backfires and falls on it face under load. I can run through the gears (its a automatic) and it runs better. this seems to happen after it warms up.
I have
1. rebuilt the tranny
2. cleaned and rebuilt injectors, they have a perfect spray now
3. changed plugs, cap, rotor, fuel filter.
no check engine light comes on, I am stumped any help would be appreciated.
the car backfires and falls on it face under load. I can run through the gears (its a automatic) and it runs better. this seems to happen after it warms up.
I have
1. rebuilt the tranny
2. cleaned and rebuilt injectors, they have a perfect spray now
3. changed plugs, cap, rotor, fuel filter.
no check engine light comes on, I am stumped any help would be appreciated.
Thread Starter
Pro
Joined: Jul 2005
Posts: 547
Likes: 21
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Ok guys I could use some help with this.
the car backfires and falls on it face under load. I can run through the gears (its a automatic) and it runs better. this seems to happen after it warms up.
I have
1. rebuilt the tranny
2. cleaned and rebuilt injectors, they have a perfect spray now
3. changed plugs, cap, rotor, fuel filter.
no check engine light comes on, I am stumped any help would be appreciated.
the car backfires and falls on it face under load. I can run through the gears (its a automatic) and it runs better. this seems to happen after it warms up.
I have
1. rebuilt the tranny
2. cleaned and rebuilt injectors, they have a perfect spray now
3. changed plugs, cap, rotor, fuel filter.
no check engine light comes on, I am stumped any help would be appreciated.
You have to be sure everything is set right for starters. Answer some questions for us. Have you played with any of the settings on the TBI's? Have you messed with the timing? Are you missing any parts on the crossfire or the engine?
What side is it backfiring on?
Jim
Le Mans Master
Joined: Apr 2001
Posts: 5,000
Likes: 1
From: Minneapolis, Mn USA
Is the idle high or normal? If high, check for the notorious CFI vacuum leaks around the TBs and intake manifold top lid.
If idle is normal, it could be your ECM. They have been known to go bad, I think Rock Auto has had them in the past.
You could also try replacing your coolant temp sensor if the problem seems to show up at temp.
If idle is normal, it could be your ECM. They have been known to go bad, I think Rock Auto has had them in the past.
You could also try replacing your coolant temp sensor if the problem seems to show up at temp.
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
how many miles are on the motor?if everything electrical checks out ,pull a valve cover off and see if rocker arms arm traveling as much as they should .cam or plastic timing gear or chain.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
Sounds more like a timing issue, go through the "sticky" in the above section, hopefully that will help you out. Be sure to check the ignition module in the distributor, it must have lubrication between the bottom of the module and the plate it attaches to. Not saying that this is the problem, but it could be that when the module heats up, it may be shorting out and altering the timing, therefore causing the backfire. The only other item I can think of is that there is a fuel related problem that may be creating the problem.......Tom
Thread Starter
Pro
Joined: Jul 2005
Posts: 547
Likes: 21
Sounds more like a timing issue, go through the "sticky" in the above section, hopefully that will help you out. Be sure to check the ignition module in the distributor, it must have lubrication between the bottom of the module and the plate it attaches to. Not saying that this is the problem, but it could be that when the module heats up, it may be shorting out and altering the timing, therefore causing the backfire. The only other item I can think of is that there is a fuel related problem that may be creating the problem.......Tom
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Don't forget to disconnect the advance when you set the timing.
The balancers can slip on the rubber O ring. You can check it. set the mark on the balancer to zero and see if the rotor is pointing to number 1.
Jim
The balancers can slip on the rubber O ring. You can check it. set the mark on the balancer to zero and see if the rotor is pointing to number 1.
Jim