Hey Guys,

I am having the same problem and also hesitation and sputtering. So what was causing your problems?

TIA

Jags

 

I haven't figured it out yet as I haven't put in the new MAF. I DO know that symptoms of a bad/failing MAF include initial take-off hesitation, slightly lean at WOT (harder throttle), and rich under idle. Those are my EXACT symptoms according to my check engine lights and my datalogger (I've logged my car's fuel trims, o2 voltages, air intake, etc while doing some runs).

Are you getting any CEL's? Are you getting the hesitation sputter under a low speed take-off/roll or are you getting it under hard throttle? Hard throttle is probably your plugs, while low speed could be a MAF, injector, or an O2 sensor. It really depends on your check engine light (if you get one).

 

I am getting p0175 and p0172 every 80 miles. I am getting the hesitation and sputtering at low rpm and when I go wot

Jags

 

It's either your MAF or a vacuum leak of sorts. Fuel pressure is another option, but wouldn't that affect your WOT runs? Mine are fine with no hesitaton. O2 sensors? Perhaps, but both at the same time? I dunno about that. A vacuum leak typically throws other faults, but perhaps you and I both are experiencing the same leak? Maybe? I would figure that the frequency would be more if there was a leak where as a faulty MAF signal is more intermediate.

http://www.obd-codes.com/trouble_cod...gen-sensor.php

I have a hard time believing that BOTH o2 sensors are going bad at the same time. If it was just one bank, then that might be the problem. However, both at the same time is remote. It could be, but chances are that it is not. The MAF, however, will affect both. I've talked to Stephen @ IA and he seemed to agree. Shoot him an email with the CELs, symptoms, etc, and see what he thinks if it will ease your mind.

 

Just got done cleaning the maf and took the car for a drive. So far no hesitation or sputtering. Seeing full boost too. Now let's see if the codes come back.

Jags

 

Congrats! I hope that my diagnosis was correct and that your worries will be over. I'll keep my fingers crossed. Please keep me updated.

A. Exactly how did you clean the MAF? (Steps, chemicals used, etc) This might prove to be VERY useful to all of the forum, not just me.

B. What type of torx socket/screwdrive is needed? Specifics? I was told that it was a special type with a hole in the center or something along those lines.

 

Thank. I just got back from a 40 minute drive and the car runs like a raped ape!

As for the tool I don't have the specs because I got the tool along time ago with an intake kit for my old m3.

I removed the maf and sprayed it down thoroughly with a electric circuit cleaner I got from Radio Shack. Then let it air dry for 30 minutes.

I hope this helps and good luck

Jags

 

Yeah, I would guess T-15 to T-20 torx bit with the "tamper proof" tip. I'll call Porsche and see if they know the exact size.

Keep me posted as to the code coming back or not. I have 32k on my turbo, so MAF contamination could be a definite posibility. What type of cleaner did you buy from Radio Shack? Anything specific that I should know?

Thanks for your help. I have a feeling that I will go down this avenue as well.

 

Hey Ruiner - EVO may sell you one. The ship them with the VFLOW intake.

Mike

 

I can get a MAF from a few different places. However, I'd rather give a shot at cleaning mine before I go out and buy a new one. If I destory my current one, so be it. I can always buy a new one if that is the case. My only hope is that my diagnosis was correct and my MAF is the actual problem.

Thanks for the advice, though. MAFs seem to be failing left and right on these cars. Mostly because of the oil/residue located on the aftermarket filter, but sometimes for other reasons (voltage issues brought about by chipping the car).

 

He is not talking about the maf but the tool to remove it.

I used electric circuit cleaner.

Jags

 

Thanks Jags. I'm 1 step ahead of you.

Ruiner - EVO supplies the fancy torx wrench, to remove the OEM MAF screws, with the VFLOW air box. I'm suggesting there is a possability they may sell you the wrench.

Mike

 

To remove the MAF you need a tamperproof Torx 20. You can get a kit of tamperproof bits here:

www.harborfreight.com

item number 91310

The cheapest place that I know of for the MAF is here:

http://www.autohausaz.com/catalog/lo...Token=80622876

 

Thanks for the Torx size. That is a great price on the MAF. Which one belongs to the 996TT? I would assume the top one? Part Number
0280 217 007?

 

The egas one, believe it or not, the cheaper one. Just to be sure you can pull the old one and check the Bosch part number on it.

I had to buy the non-egas one for another car. The part that I got even had both the Bosch and the Porsche part number on it just like the one that I replaced.