HELP ME PLZ!
 

I have a engine misfire. i replaced all the O2 and wires and triple checked to make sure they were all good. I went to advance auto and he scanned it for me and im getting a fuel-air metering code he erased it before i could write down the P number any suggestions :-(

Did the code appear before or after you changed the O2 sensors? How many miles since you replaced the O2's?

-Tim

i did the headers about 2 months ago and idk when the code came on because before it only through a code for the rears.

what kind of plugs did you put in there?

tr55

it was for a bank x, sensor 2?

some ls1's dont like them for some reason. My car loves them but my dad's vette hated them.

wow my car ran amazing tonight in the cold pulled harder then ever before it could just be the cold im gonna try switching my fuelfilter maybe thats the problem

usually no but try it anyways.

Could it be a tuning issue with your long tubes?

would that create a missfire?

i never had any problems after LT install. the car might run a lil rich, but shouldnt cause misfires. i have a handheld OBDII scanner. im going to atco tonight. if u want i could scan your car there

What are all the mods? Do you have cats or not? My 2000 with the longtubes and dual cats was on the edge of the stock computer settings with it adding 12-13% fuel while cruising. Do you have a tune yet? If not, then that might solve your problem. You might also have a weak injector that is causing a lean cylinder and a misfire. Have you had someone scan it while driving? I have the Diablosport that can show some realtime data.

Air/ fuel metering is front O2 related
Check your O2 extensions and make sure they havent touched any of your exhaust and melted,ect if you used extensions with the headers..
They also share the same fuse as your Maf and can cause problems with either or both..

I'm gonna second Jeff's suggestion of a possible lazy injector.

Get it scanned, check which side, try swapping O2s side to side, also might want to do the same with coils. I'd rule them out before you purchase injectors. A weak coil would cause a mis as well.

went to jeff's last night and he scanned it no codes though. The car is running very lean though. O2 are working properly. He said he thinks it may be a header gasket leak so i'm going to check that tomorrow morning. Thanks Jeff!

It definitely has a miss or thud, thud, thud type of sound/feel. But at idle it's tough to notice any problem. The fuel trims were jumping up to 25-32% under acceleration so I'm thinking a header leak or loose spark plug causing it to read lean and dump extra fuel in. My car would run at 12-13% fuel trim before the tune but I do have dual cats so he has a little less backpressure.

Wow. What a relief. I figured it out. I pulled all the plugs and wires last night. One of the connectors inside the wire was too far down for it to reach the connector on the coil pack so i shimmied it up and now its on. I don't feel anymore stumble only around 2200rpm....... Also you cant hear the miss out of the exhaust anymore... Off to a tune! Thanks for all your helps guys especially Jeff.

That's good. I kept thinking exhaust leak or a cylinder not firing properly. I figured a loose spark plug would cause both.