nicklausw

Does anyone have the specifications for long and short trim fuel at idle and under load, as well as what the range (g/sec) is for the MAF sensor?

I am fighting P0101 and deductive logic has taken me as far as I can go. I have checked for vacuum leaks, a bad connection on the MAF harness, and switched to a new Denso MAF sensor. No luck... It is still choppy in the lower rpms. I have not seen anyone say in similar circumstances that it is o2 related, but I am beginning to wonder if it could be.

UPDATE: Solution found on page 2

Let me just say that Simon and Rafi have been great in helping me through this issue. They have picked up the phone, emailed over the holiday weekend, and offered sound advice for troubleshooting. Thanks gentlemen!

UPDATE 2: The problem persists despite the new MAF pipe. Fuel trims are showing a lean mixture. The car runs fine with the stock box and RR tune, but all hell breaks loose with the RR tuned intake and a couple of different maps for the intake.

Vervish

iTrader: (4)

I would also look at the intake elbow to confirm there are no post maf cracks.

At idle I have logged between 5-5.4 g/sec. My logger does not log fuel trim.

nicklausw

Thanks. I am running a Joe Z elbow with the RR intake box and I cannot find any leaks post-maf.

KLexus50

Nick, I've been having the same issue with the rr tuned intake. About every 50 miles i would get a CEL which would always include P0101 and a P1170 every so often also. After a month of trying to track down what could be causing it (including a new maf), I finally reverted back to the stock airbox and regular tune. Absolutely no issues to report for the past 200miles so far. I still have to email rr about this issue since I'm a little upset that I have a $650 part I can no longer use.

nicklausw

I put my stock intake box on and still pulled P0101.

nicklausw

My ft for sensors seems to show there is an issue.

ping83

iTrader: (8)

However you stock box is damaged and no good with cracks though.

Can you revert to stock ecu with no tune to see if it is pulling the codes?

nicklausw

Zmcgovern4 has my old PPE conditioner, so that makes it more difficult.

KLexus50

What's your drive cycle like between codes after you have cleared them? Does your CEL go off after about 50 miles of driving like mine did? Also, do you have an AOS system?

nicklausw

I get a code within 20 miles of driving after clearing the code and resetting the ECU. It has never cleared itself. I do not have an AOS, so the lines going to the PCV have not come off.

zmcgovern4

iTrader: (2)

I think the next logical step is to put the car back to the way it was before codes... so remove tune and remove RR air box.

You're welcome to remove and borrow the O2 conditioner from my car for a few hours to get the feedback you need to help determine if the issue is correlated to the RR mods or not.

Meanstreak

nicklausw- make sure the AOS hoses are pushed all the way in to the fittings. Also check that the reservoir cap is tight. I had this happen to me - not an RR issue I had accidentally knocked a hose loose doing other work.

nicklausw

I don't have the AOS, so that eliminates all those leaks on the PCV vacuum lines. I have also thoroughly gone over the vacuum lines and have not come across anything that changes idle. There is a tech at the dealer that is aware of my mods and issues. I am hoping to have him take a look soon.

KLexus50

Probably a silly question but I didn't see this explicitly stated anywhere; did you reflash the ECU to the regular, non-tuned intake tune after putting your stock airbox back on?

zmcgovern4

iTrader: (2)

He cannot do that because he sold his O2 conditioners to me, so he would have issues right away if he went back to stock airbox & tune without O2 conditioners.