firepheasent

Here is the whole deal...

Fuel @ Idel is 38
Fuel @ WOT is 45

O2s are reading @ 820 to 830 @ WOT

02s use to be arround 890ish @ WOT

IPWs are arround 19 @ WOT untill 5,000 then 19-20.XX on up

Car ran a 13.65 @ 102.7 with the clutch slipping 2nd and 3rd a little. With Good O2s readings

Now I cant break a 14.0 or more than 99 mph at the track after the clutch install.....WTF all I can think is its related to the poor O2s reading????

Only mods are CAI , MagnaFlow Cat back, Air Foil and a De screened MAF.

All runs were made with the same Mods. PLEASE HELP me or the car is gonna go to the junk pile.

IrocManiac

Check your fuel filter too. If you got some bad gas you could have gummed that up (although your fuel pressure looks ok)...its an easy cheap fix...the O2 readings could be effecting your times but thats a fairly drastic change in times....unfortunately I do not know a lot about the O2 readings...

96ZRDR

It is normal to see your 0'2 readings that high at WOT. The PCM goes into Fuel Enrichment mode at 100% trottle.

Injuneer

I think he understands the basics..... he's asking why his O2's used to be 890mV at WOT, and now they are 820-830mV at WOT.

Just for the he!! of it, try putting your MAF screen back in.

If that doesn't work, scan it and see what the long term fuel corrections (BLM's) are for a wide range of "cell" values, and in particular Cells 15 and 18.

firepheasent

BLM are 128 in cell 18 (WOT) and cell 15 ( idle ) are normal according to what I read.

Im gonna try new O2s this week and see if that helps at all.

I just put in new Injectors also to see if that would fix the problem but no such luck!!

And yes I understand the Basics and Beyond the Basics. I was hoping that someone had a similar problem and had a idea maybe brighter than mine!!

Injuneer

Cell 15 is highest rpm/highest load (MAP) cell, and typically used by the PCM in power enrichment mode, IF the cell values are above 128. If they are below 128, PE mode defaults to Cell 18/128 BLM's. Idle is Cell 16.

firepheasent

So what wrong with my car??

I have Good fuel pressure

I changed the Injectors to a fresh pair

I replaced all O2 sensors for the hell of it

Swaped to a MAF off a well running car just in case

New opti, plugs , wires and fuel filter 2,000 miles ago.

I still have high IPW arround 19-20.XX over 4,800rpms
O2s are still low @ 800-840s @ WOT

Im getting 1-5* of knock with a LT4 km @ high rpms

I am running Autolite 104s gaped @ .040 / For nitrous but never sprayed yet. Could the plugs be the cause of my problems?? Keep in mind the car had those plugs in it when it was running good at the track.

Is there any other sensors Im missing that could be related?? Convertors?? (cats)
This is a fairly stock car, Catback/ CAI / LT4 KM

Next step is getting larger injectors and a cutom dyno tune to bring it all back to normal but $$ wont let that happen anytime soon.
And the car is a M6 in case that helps

Injuneer

What year is your car?

If its OBD-II, how are you measuring O2 values? The HPP+ scsan cartridge, for example, gives "lower than normal" O2 readings.

Do you have extensions on the O2 sensors? Are the wires running near high voltage wires, like plug wires? Not likely with the mod's you list... thought I'd ask.

Have you checked the inlet bellows for a tear at the bottom that only opens up at WOT?

firepheasent

Ijuneer... So you know my buddy Curt do you or at least he knows you. Hes got a 95 white form with a recent 396 motor he built!! Anyways I sent you a Email with my Cell #. A quick call would be cool of you but if not I understand. I sent you some more info on my car also.