16.4 is what the LTFT's MAX at.

Your car is starving for fuel and I believe it's the reason you are getting misfires. The PCM is dumping in 16.4% more fuel to the A/F mixture to try and reach stoich. You are running mad lean.

Are you sure you don't have a vac leak?

Like Zalfrin pointed out it could be a dirty or failing o2.

What are the LTFT's when cruising or WOT? Or is it at idle that you only get misfires?

yes, running lean is why it is misfiring, 16.4 LTFT is a symptom of the air/fuel/sensor issue.

ive never changed the o2. Its only at idle that i get misfires.

but, why out of NO WHERE would it start misfiring this bad?

sorry, I'm a little behind and haven't been following the thread too much other than page 4.

Tim, things do just malfunction and break out of nowhere.

On your scan gauge do your o2 voltage readings constantly switch back and forth from 0 and another number?

idk randall, i havent checked out many readings. I will wait until lonezerg stops up here so he can check everything out.

lol im too nervous to touch this car anymore....

i used to be that way too lol...

so, i just talked to a friend of mine over in colorado who has a 98 swapped gt, he said that with the symptoms i am explaining, that it is most likely a bad o2 sensor.

I explained to him that for the first minute after a cold startup it runs fine and once it warms up than i get the bad idle. I also said that once i give it gas, it will go away.

He said that for the first minute after a cold startup the o2 sensor is in closed loop and after it warms up it becomes open looped, which explains the bad idle. He than said, once I give it gas in drive the reason it goes away is because it goes into PE.

lol SO, i just bought an o2 sensor from zzp.

** I checked all wires for the sensor and they are all intact, no melting or anything, so no signs of grounding out.**

How did you extend the o2 harness? Did you buy the extension harness, or cut and splice?

no, we unwarveled the original engine harness and pulled it out and un tangeled it and extended it. There was no cutting or splicing that took place with the extension of my harness.

Tim, I'm looking at your .bin right now and something seems really off.

Your MAF table starts at 3.09gps. That's 2 whole grams more than even my MAF table. And it keeps going up. Your MAF table is quite a bit higher than mine actually.

Who tuned your car for you?

ZZP

Off the shelf or did you have them dyno it? I can't remember.

it was dyno tuned.

Wasn't there an issue prior to the dyno tune? That was supposed to get fixed while at ZZP?