It started last week, I put SHITGO premium gas from the hood bc the price was cheap. I ran a whole new tank of 93 from Shell along w/HEET and seafoam and it still misfired.

Today I changed the plugs w/NGK Iridium and the o2's back to new stock Delphi ones bc I was having o2 DTC codes like crazy . It ran GREAT and then started misfiring 15 minutes later on my way to work. They bank 1 plugs (TR5's) looked good but bank 2 was caked in soot, same for the o2's. What could it be?

A friend said he had similar problems when his fuel pump was on the out, but wouldn't it cause misfires on all cylinders not just 1 bank?

these were my common codes:

P0155
P0300
P0442
P0135
P0174
P0151

The drive home was terrible!! A co-worker followed me some what, and I could see the smoke pouring out. I went through a 1/4 tank and was popping like crazy. But it was intermittent, it would misfire then stop and then start misfiring again.... oh and no other codes besides the P0300 - multiple misfire one came on

Thanks

 

It started last week, I put SHITGO premium gas from the hood bc the price was cheap. I ran a whole new tank of 93 from Shell along w/HEET and seafoam and it still misfired.

Today I changed the plugs w/NGK Iridium and the o2's back to new stock Delphi ones bc I was having o2 DTC codes like crazy . It ran GREAT and then started misfiring 15 minutes later on my way to work. They bank 1 plugs (TR5's) looked good but bank 2 was caked in soot, same for the o2's. What could it be?

A friend said he had similar problems when his fuel pump was on the out, but wouldn't it cause misfires on all cylinders not just 1 bank?

these were my common codes:

P0155
P0300
P0442
P0135
P0174
P0151

The drive home was terrible!! A co-worker followed me some what, and I could see the smoke pouring out. I went through a 1/4 tank and was popping like crazy. But it was intermittent, it would misfire then stop and then start misfiring again.... oh and no other codes besides the P0300 - multiple misfire one came on

Thanks

 

That is what my 02 did when the fuel pump went out, but the one bank thing is kinda fishy.

 

Def need to check fuel pressure. do you still have cats?? the tr5s are quite a bit colder so def not hot enough to self clean. Backfiring or running bad at all would probably foul them pretty quickly. so I doubt they are your problem just an after effect

 

exactly, I could understand if it was but the one bank think is losing me too

 

I'll try to check the FP tomorrow. No the cats have been eliminated

 

A lot of codes there friend. Seems like they are all emission/O2 related. What's up with the tune - do you have tuning software? That could help you a lot. It would be great if you could force it into open loop - or just to see if MAF, MAP, etc are operating correctly.

TR5s are stock heat range, ignore that.

Fuel pressure is a good idea.

 

With your new software, run a log. Any exhaust leaks?

 

after reading one of my logs on HPT, my bank 2 o2 isn't running.... I'm gonna try a crank relearn tomorrow and hope it helps.

Any other suggestions on what caused it or how to fix it?

 

Sorry CASE relearn*

These are brand new o2's if you missed it up top!