What causes backfiring?
Instructor
Joined: Apr 2002
Posts: 126
Likes: 0
From: port saint lucie florida
if it backfires through the intake..it is lean or you have timing or spark plug wire issues.
if it backfires through the exhaust you have a rich issue, timing problem or the plug wires are on incorrectly. if you have an exhaust leak it will also cause a back fire or popping on decel. just what i can think of quickly.
if it backfires through the exhaust you have a rich issue, timing problem or the plug wires are on incorrectly. if you have an exhaust leak it will also cause a back fire or popping on decel. just what i can think of quickly.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
Do you have any exhaust leaks? Sometimes that will cause it on decel.Should be able to hear it if it leaks have someone rev it and let off while you check by ear both sides.
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Originally Posted by 94brick
Yes only through the exhaust on decel. So plugs or timing? I wonder then were do I start?
Racer
Joined: Mar 2004
Posts: 311
Likes: 0
From: Oakley Ca
Originally Posted by old salt
if it backfires through the intake..it is lean or you have timing or spark plug wire issues.
if it backfires through the exhaust you have a rich issue, timing problem or the plug wires are on incorrectly. if you have an exhaust leak it will also cause a back fire or popping on decel. just what i can think of quickly.
if it backfires through the exhaust you have a rich issue, timing problem or the plug wires are on incorrectly. if you have an exhaust leak it will also cause a back fire or popping on decel. just what i can think of quickly.
Looking for an exhaust leak would be where I start. Easy things first!
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
Well you installed headers now the rumble is out of the bag. 
If you listen close the car always did the rumble backfire noise but with the headers it is more noticable.
The LS1 is even worse then the Lt1.
The standard is check the fuel presure should be at 43.5 lbs
and go from their if you want to chase something.
If you listen close the car always did the rumble backfire noise but with the headers it is more noticable.
The LS1 is even worse then the Lt1.
The standard is check the fuel presure should be at 43.5 lbs
and go from their if you want to chase something.
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