backfiring through exhaust after rebuild???

shelby2 · 02-19-2001, 04:28 PM

actually, the car is running rough and sluggish in the low rpm's and i have the timing at 14 degrees. i was thinking of getting a msd box and coil to see if that would help me out. when i do advance the distributor past the 14 degree point the throttle response is smoother and the engine runs better, but the rpm's are to high so when i put it in gear the engines dies, and i have the throttle adjusted down as much as i can. i was going to get new o2 sensors but am waiting for a friend to see if he can get them for free.

it does not do it when i let off of the throtte, only when i am accelerating and ad that only once in a while. i am stumped. i have also noticed some pinging in the motor which i think may be advanced to far. i'll have to look into it more though. also, the backfiring seems to only be in the low rpm's. i was thinking that since my gears are so low that the computer's advancing is to far ahead of my combo's powerband which starts around 3000 rpm.

------------------
shawn hill
1967 ford mustang coupe, red w/white stripes, hood scoop, front and rear spoiler, sefi and c4, trickflow intake, 70mm mac tb/egr, billet fpr, 24# inj, c&l maf, heavy duty c4 w/transgo shiftkit, flowtech longtubes w/turbo mufflers, t-rex inline pump, ported and polished E7TE heads w/1.94,1.60 valves, lunati 292 cam, harland sharp 1.6 rollers, conventional 8" with 2.79 gears (soon will be gone)

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02-19-2001, 04:28 PM	#6
shelby2 Registered Member Join Date: Nov 1999 Location: O Fallon, IL Posts: 87	actually, the car is running rough and sluggish in the low rpm's and i have the timing at 14 degrees. i was thinking of getting a msd box and coil to see if that would help me out. when i do advance the distributor past the 14 degree point the throttle response is smoother and the engine runs better, but the rpm's are to high so when i put it in gear the engines dies, and i have the throttle adjusted down as much as i can. i was going to get new o2 sensors but am waiting for a friend to see if he can get them for free. it does not do it when i let off of the throtte, only when i am accelerating and ad that only once in a while. i am stumped. i have also noticed some pinging in the motor which i think may be advanced to far. i'll have to look into it more though. also, the backfiring seems to only be in the low rpm's. i was thinking that since my gears are so low that the computer's advancing is to far ahead of my combo's powerband which starts around 3000 rpm. ------------------ shawn hill 1967 ford mustang coupe, red w/white stripes, hood scoop, front and rear spoiler, sefi and c4, trickflow intake, 70mm mac tb/egr, billet fpr, 24# inj, c&l maf, heavy duty c4 w/transgo shiftkit, flowtech longtubes w/turbo mufflers, t-rex inline pump, ported and polished E7TE heads w/1.94,1.60 valves, lunati 292 cam, harland sharp 1.6 rollers, conventional 8" with 2.79 gears (soon will be gone)