Car Sputters after heating up

[blacksilvia84]

I have recently got my car back on the road. It has been sputtering and back firing after it heats up.

Checked
timing - right on
Plugs - white in color
Coil packs
Injectors - All working
Grounds seem to be good

Out of ideas

A new problem my key sometimes wont come out i have to manually push the lock up could this be the problem or something else. Car ran great before it sat for 3 months.

Sr20det
ssautochrome full exhaust motor back
gt28 turbo
megan racing intercooler
blitz bov
300 zx tt fuel pump

[johngriff]

white plugs + sputtering.... hmm

what is your air fuel ratio?

[blacksilvia84]

I have no clue dont have a gauge. Its just odd that it only after it heats up.

[blacksilvia84]

It only does it under load, idles fine. It back fires and sputters then almost like the timing is off but checked that

[nassin31spr]

Try checking your wiring and the signal from the O2 sensor. Once had an sr with the wiring done wrong on the harness for the sensor. It would sputter after it got warmed up. Redid the wiring and it was good to go.

[fliprayzin240sx]

If it runs fine cold and then runs doo-doo hot, check the ECU water temp sensor. If you check on top the thermostat are, there will be 2 sensors. The big one on the left is the ECU sensor, next to it is your gauge water temp sensor. Change the one on the left, part should be like $20 from the dealer. Just cant remember exactly if I crossed reference the part from a KA.

[blacksilvia84]

I changed the water temp sensor and it still does the same thing. I am going to check my o2 sensor wiring and see if thats the case.

[blacksilvia84]

Today i re wired the o2 sensor and my problem still exists. It seems to me like it is some kind of electrical problem. The car was in an accident and before that ran great. So from that time till now something has changed. I have checked my grounds and they seem to be fine as well. I am out of ideas does anyone have any other suggestions.

Car runs fine until it heats up then has no power, back fires, and sputters.

[-L(-.O)]

where was it hit?

[blacksilvia84]

Dead center front bumper