vipman757

Could bad gas made it backfire? ?? Car run smooth n idel fine just backfire when pressed the gas down hard ..plz help

RTIS250

iTrader: (9)

Any codes stored in the computer?

vipman757

I scanned the code n it said knock sensor

vipman757

Recently just changed new plugs( ngk inridium gap is .004)n (new wires oem ) then check engine came on start backfiring ..scanned the code n it said knock sensor ...keep in mind car wasnt actting up til new plug n new wires went in ..car is running fine n idle normal n drive smooth but still dont know y is backfired. ..only backfire when I stomp on da gas real hard ....I even cleaned the mas intake sensor , clean out the vvt sensor and the lil oil filter........check engine light still on n still backfire on fast acceleration. ....plz help .....ty in advance guys

mitsuguy

iTrader: (2)

sure you didn't get a plug wire and/or coil switched around???

mitsuguy

iTrader: (2)

look at your other thread... after you changed the wires and plugs, are you sure you got the plug wires and coils back where they are supposed to be??/

vipman757

I did put coils back in correctly. ...scanned the code twice just must sure n it still said knock sensor circut1..still dont know y it backfiring

mitsuguy

iTrader: (2)

A malfunctioning knock sensor will not cause one of our cars to backfire, period... Being that that has no bearing on your backfire, the most common other cause is a coil in the wrong place or spark plug wire in the wrong place... not sure if it is possible because of wire lengths, but maybe a coil wire (the plug from the ecu, not the spark plug wire) got swapped...

Aside from that, hard to say unless you've got something else unplugged, but I can't imagine what in the intake system that would cause a backfire...

vipman757

Still cant identify the prob ...check egine light still on n same code saying knock sensor circut 1 ...imma just go head n replace the knock sensor just to see if the issue will goes away ...ty in advance for helping