454 Chevy engine backfires
Replaced a 454 engine last fall, drove it about 350 miles and put it in storage for 6-7 mos. when i got it out,it started backfiring under a hard accel. Any suggestions//
Forum Discussion
- Try some Red Line Fuel System Cleaner.
- My 1996 Chevy 454 was doing the same thing. I replaced the plug wires with an after market set. Solved my problem.
wheelmanii wrote:
My 1996 Chevy 454 was doing the same thing. I replaced the plug wires with an after market set. Solved my problem.
X2
Had the same problem. The stock exhaust manifolds make it very easy to burn the spark plug wire insulation causing an intermitant spark and backfiring.- Some years ago I bought a beautiful 88 allegro with 454 loaded with smog stuff. the first thing I did was replace the timing chain and gears with a full roller with straight up keyways add dual exhaust and get rid of all smog stuff.That thing ran like a scalded dog. Because we know smog motors have keyways cut 4-8 degrees retarded.....so, did you use your old retarded chain and gears? If not ,did you degree your cam to see if it was retarded? just a thought.....like a doctor you have to eliminate everything.
