96cherokeemike

hello was wondering if anyone had or has this problem with their jeep, i re did the entire exhaust, including putting on an aftermarket stainless header, also running no rear 02 sensor, and idling is fine and WOT is fine, its when im trying to drive it normal it starts to backfire and it sounds like its through the intake not the exhaust. any help is appreciated!

91jeepster

what year, if it's 96+ rear O2 makes a difference. did you keep cat or full exhaust? and this this just start after this mod.

96cherokeemike

yea is a 96 with obd2 and i cut the rear o2 out, thats what i was worried about, it doesnt do it all the time now just every so often, i have a donor jeep so maybe ill put the o2 back in and see if that helps, thanks for the input appreciate it!

salad

OBD-2 uses the rear O2 for setting the fuel mixture. You'll need to put it back lol.

Though it shouldn't be significant enough to cause backfiring - check your MAP too, could be borderline

96cherokeemike

ill have to do that, i really didnt have any problems with it running like this until i put the header on, but that would make sence because its letting more flow in a way i suppose, ill do some checking on both these, thanks for the input!