Backfire!! Flame!!
Thread Starter
Teching In
Joined: Mar 2021
Posts: 36
Likes: 4
Backfire!! Flame!! Hey
I have a LS3 swapped Porsche, track only car. Terminator X Maxx, runs great EXCEPT on closed throttle backfire on decel, usually above 5000 rpm, plus, after a strait away, long or short, BUT ONLY out right side cylinders 2,4,6,8 side. So much that the right exhaust is white, drivers side black. I am told it puts out a flame, right side only, many drivers have seen it, and it did blow apart a set of Flowmater 40s last year, guts rattling around and cases clearly bulged out. I swapped all left and right injectors, same thing, swapped plugs and wires left to right, same thing, O2 sensor is on the left. Exhaust pipes are not joined in anyway..IDEAS????
I have a LS3 swapped Porsche, track only car. Terminator X Maxx, runs great EXCEPT on closed throttle backfire on decel, usually above 5000 rpm, plus, after a strait away, long or short, BUT ONLY out right side cylinders 2,4,6,8 side. So much that the right exhaust is white, drivers side black. I am told it puts out a flame, right side only, many drivers have seen it, and it did blow apart a set of Flowmater 40s last year, guts rattling around and cases clearly bulged out. I swapped all left and right injectors, same thing, swapped plugs and wires left to right, same thing, O2 sensor is on the left. Exhaust pipes are not joined in anyway..IDEAS????
TECH Fanatic
Joined: Jan 2018
Posts: 1,059
Likes: 197
If that ECU has per-cylinder fueling adjustments, see if one of them accidentally got set to something way different from the others.
Try swapping all of the injectors from right to left and see if the problem moves to the left side. If it does, swap them back one at a time and see which swap causes the problem to move back. That's your bad injector.
Try swapping all of the injectors from right to left and see if the problem moves to the left side. If it does, swap them back one at a time and see which swap causes the problem to move back. That's your bad injector.
