What is your next move 996tt550hp?

As a side note, while reading your thread I believe you mentioned something about a delay, hesitation around 4200 rpms. Did you happen to change to a different type plug? How many miles are your plugs?

I just did another pressure test from the TB and blocked off the intake that i borrowed from another 996tt guy and it held 20psi again. So its absolutley not a boost leak but i did find something. I was getting gas and i took the gas cap off and no pressure so i look at the cap and the o ring is all old and cut up. So new cap in 10 min. I will do a fuel pressure test next if its not that. Its leading to the FPR if nothing else comes up.


We will see remember this only happens after i drive for 30 miles or longer. Ohh for the hesitation at high RPM that was fixed. The line at the n75 fell off i also do see no one else has this problem so i guess i just got hit with bad luck.


Also i do remember from the shop they did tell me when taking off my stock FPR they did say there was no pressure whatsoever and they said that was odd. Now i know before this when taking my gas cap off i had the pressure released big time.

Just keep in mind plugs with 30-40K miles many times cause issues.

Are you only pressure testing from the throttle body or are you testing from the turbos and airbox too?

Tested turbos and TB both hold good pressure not the easiest thing to do.

Tony told me this also i think he has plugs and a colder spark plugs for sale. I need to ask him and yes your right that will be done asap. The holifays are not helping much lol.

For all this time and trouble... A durametric is really not that expensive. You need to order one ASAP.

This thread is sort of like a car wreck... I just can't look away.

Regarding the durametric, you can usually call them and get a refurb one with same warranty and 3 vins for like 225 shipped.

I already have it and used it. It's ok.....

Fixed IT

MAF Shot


To make this short i went to start my car everything worked great until 15 min later trims go whack to -20 ST trims also bogging and stumbling when revving the car or light throttle.

Took the MAF and unplugged it and revved it out and no more stumbling. Checked the fuel trims and there back to normal. Unreal something as a simple part right under my nose caused so much sh** Thx to the EVOMS Intake under 1.1 bars and freezing cold weather it blew.

Symptoms:::::

Bogging
Hesitating
Part throttle stumble
Fuel trims go crazy rich after running your car for awhile
P0175 and P0172 rich condition both banks


ATTACHED pics on the right shows when my MAF is unplugged and on the left shows when it was connected. Yes it is running a little lean at idle thats because i don't have the new MAF hooked up yet. I'm picking it up right now.

Then help your tuner out and whip it out. He needs a full log to see whats happening at every millisecond of your car's running. Your screenshots of an obd scanner is just showing a single frame of time. If you do a full pull and post the logs, he can see every little hiccup your ECU detects.

Tony is one of the people keeping the 996/997.1 one of those platforms that competes with the legendary supra. We need to support our tuners, just as much as they support us.

Time for some Durametric Logging!

good to hear you got it figured out. it SHOULD have been one of the first places you looked.

To both people above yes i will do new numbers and for Tony i will send some money over to him for this. I never thought that the MAF would go out i restarted the car again and it revs all the way up but i put back the old MAF and it stumbles and bogs.

Ok if you are going to mod your car and work remotely with a tune you have to use something other than a small capture at one single moment (according to the website it's when the code is thrown). Some of the CEL you will get on a Porsche do not instantly show up it will do it over time/key ons/etc.. I know you probably think people are just following a leader but honestly the more I used the more I took advantage of the Durametric. Hell I have the Professional or whatever unlimited license one now in case anyone needs help locally.

Examples of why logging is critical and of course these are WOT on the dyno but I've sent idle/drivability over to have gone over. Tony hated me because I'd get lazy and call with "the AEM is showing like 11.8, at least thats what I saw". So I made a habit of having my laptop out so I can get info he can use to help.

This was my pull from 10/30/2009 when we made 845rwhp on stock motor and stock DME. This is why logging is important



My brothers 997TT with a BL1000 kit again dyno logs that sent for Tony to go over.



Also note there are LINES AND LINES of the car at idle and driving. The 997 log is over 900 rows and 996 had over 800 rows in the actual log. So it covered almost all of it to look for errors.

On my Syvecs I literally have real time logging regardless if I start a log for a pass down on the track as it has built in ones it keeps for MULTIPLE restarts (think it is a 4 meg cache for logs). It's a little bit blurry but the right hand side is running variables and on the bottom right is even an ECU function window showing what states it is running in.



Until you can get some real data besides the exact moment the CEL came up you can't do much. Well you can try everything but not worth the wasted time, effort and money. We started doing this 7 years ago in the garage and I tried to fight just listening to what I thought was wrong advice. Half the time I was wrong or the insight help work through things. I fight it some today just like most on small problems like this. We are trying to help out here and not here just to screw with other forum members.

Not only was it the MAF forgot to mention my Gas Cap was toast the o ring was bad. Does it matter that the new Gas Cap is from Advance Auto Parts?



Very interesting thats some good data i will have all the data monday we have some nasty weather coming. Tony wants a pull from 2000RPM and up does anyone know how high we can go to redline? i still don't so i stop at 6500rpm.



Good news i have the new MAF sensor in and im so glad to say its fixeddddddd lol. I went 102 miles around the city no cell car ran around zeros up and down ST trims and steady LT trims. By the way my spool went even faster in 3rd gear i was fully spooled at 2500rpm is that right? i mean it exploded with power. Tony you can raise my boost up now LOL. I just like to show a couple of graphs and i really hope this doesn't happen to anyone else.



Ohh by the way right now i have the new 986 MAF boxster sensor!!! does it matter? if it does or does not i have order a 996 MAF it will be here Monday morning they will swap it for me.


The graph below shows after 100 miles of driving coming to a stop, watch how it goes straight to leveling out before with the bad MAF it would just raise all the trims including the LT trims go to -9 and ST trims go to double digits as high as -25 and sit there. ECU doesn't like that and pops a P0175 and P0172.

The one on the right shows the bad MAF numbers at idle also bad miss firing and hesitation on light throttle i mean bad bogging. Never have LT trims moving rapidly or high that means something is wrong. On the left are the new numbers from the brand new MAF installed.


Old MAF at idle was around 0.96lb (something is not right here) Don't get on your car in cold weather.

New MAF at idle was around 0.56lb