MasnarT

I have a 2000 T/A ,Just put new (o2,filters,plugs,cats,lid,pulley,gears)on
car runs fine when cold, But if I drive it a few miles and stop, turn it off
for a couple min. it runs like crap. When I crack it half throttle it feels like it boggs down for a sec and cleans it self out and runs better, Only when its warmed up it does this. Can anybody help with this problem please I dont know what else to do.........

2001NBMZ28

No SES light/codes?

MasnarT

no nothing.........I did not replace the wires but they look good(55k miles)?

taintedmeat

iTrader: (1)

Maybe one of the o2's you put in is switching a little slow. You'd have to get someone with to log it for you to see if that's it unless you throw an ses light. That would tell you which one once that happens.

MasnarT

.........could it be the pcv? maybe?

Greggy

if you changed all that stuff the pcm has to relearn. When the car warms up it goes into open loop mode. Open loop is when you are using the feedback from the O2's for A/F mixture. Drive it around for a while and see if it gets better.

MasnarT

I have put about 500 miles on my car(gear break in) and it still does it, I took off the battery cables a couple time no change?

delsold

iTrader: (7)

you have that a little backwards. When you first start the car it will run in open loop where the car is either using a bias voltage supplied by the pcm, or just using inputs from other sensors to determine fuel trim. All fuel adjustments are made using long term fuel trims. Then when the o2's heat up (either by heaters, or exhaust temp.) the car goes into closed loop and uses the voltages from the o2's to adjust short term fuel trim to keep the cats happy at 14.7. You can easily relearn the pcm, or just drive it a few times and let all the monitors run. When all the monitors are complete the car should drive fine again (if o2's are your problem, and its not something else).

delsold

iTrader: (7)

Also if this helps...this may not be 100% correct, but im doing this off the top of my head and its pretty close, but the PCM relearn is.

Key on engine off-
-turn AC to on position.
Start car and let it idle for 10 mins or so
Turn off the ac and let it run for about 2 mins
Turn the car off
Restart.


I may be missing a few steps (ill look it up next time i get a chance) but try that and see if it helps.