[competition orange]

ever since kb 1.7 install i get a pop or backfire at wot while shifting and over 500miles it has thrown a p0172 rich bank one code about five times any suggestions on what may be wrong some say sticking open fuel injector i even tryd unpluging bap which should lean it out an still got the code while it was unplugged it had it had alot more power with bap unpluged so i know it leaned it out but still got rich code

[00mustang00]

if its running that rich you should probably get it retuned

[hardhitter]

What's your fuel system, do you still have a PPRV?

[hardhitter]

By the way don't go WOT with the BAP uplugged ever.

[limited]

backfiring thru intake or exhaust?

[competition orange]

Originally Posted by limited backfiring thru intake or exhaust?

almost positive through the exhaust.

[competition orange]

Originally Posted by hardhitter By the way don't go WOT with the BAP uplugged ever.

yea,i know it ain't good to do it but just wanted to see if it stopped the pop,also the guy that had kit before me was hitting 460rwhp at 9 psi which is unheard of with kb tune but he found out when he unhooked kit to sell that bap was never hooked up so that explains the xtra hp gains and he put 40,000 miles on kit with no bap,he was lucky.

[limited]

try swapping your coil packs from left to right and see if problem follows, sounds like you have a coil going bad

[competition orange]

i may try that and if that doesnt work i may try switching injectors from side to side

[competition orange]

Originally Posted by hardhitter What's your fuel system, do you still have a PPRV?

PPRV will removing this get rid of the popping?

[competition orange]

i currently have the kb tune for this,do you think this problem could be mechanical or a tune issue?what about a dyno tune do you think that would resolve this issue?

[mustanginky]

id put it on a dyno and see what it does. sounds like it's rich. one of those mail order tunes can work okay, but it isn't optimal. each car is different and will react differently.

[competition orange]

ok,i just wish i wouldve waited and got dyno tune cause the chip cost me $200 and now i wont be using it cause i have a xcal3 i want the future tunes on .the dyno tune is going to cost me $400 which sucks,i hope its worth it. lasota racing is supposed to do it.

[bandity2k00]

You will be alot happier with a good dyno tune..

[mell0]

i don't know if this has any relation, but doesn't kenne bell's bypass valve vent directly to the driver's side heads? so once you get off the throttle going WOT the bypass valve will open, dumping all of that boosted air into the driver's side heads. would that have anything to do with it?