wross996TT

Looks identical to mine '04 as well.  CDR23

But if the fault is still there, the codes will come back.  As JFP suggests, without the codes it's just a guessing game.  Lots of reasons to lose boost.  Most often this is a vacuum leak somewhere, waste gate issue, MAF, etc.

First, please tell us details of your car (MY, model, any mods, etc.).  Then I suggest you get the codes read using either Durametric or one of the Porsche diagnostic tools.  There are many possible events that could cause these symptoms from bad ground strap to immobilizer went bad.  Start with the codes.

Oxygen Sensing Adaptation, Idle Range, Bank 1& 2 Above Limit

Possible fault cause

♦ Incorrect signal from MAF sensor

♦ Intake air system leaking

♦ Fuel pressure too low

♦ Volume supply of fuel pump too low

♦ Fuel injectors fouled

♦ PCV valve leaks

♦ Cap of oil filler neck not closed correctly or seal is damaged

Cleaning the MAF may or may not work.  You can try running without the MAF (though this will throw other codes) to see if it comes back.  O2 sensors could be bad or there could be connection problems (though not sure why both went at the same time?). Check your fuel pressure. Exhaust system leaks.  Fuel injectors fouled.  When was your last service and what was done?

A poor battery can run many things on the car but still not have enough juice to start it.  First thing I'd do is replace the battery.  BTW, trickle charging a bad battery does NOT help.  You can not resuscitate a bad battery.

First post on the top of page 3 of this thread....

No not a fuel pressure test, but the entire sealed boost pressure test for leaks.  like this, though there are simpler ones. 

You definitely should replace plugs and coils.  Get the upgraded 997 coils.

Yeah, could be the O2 sensors.  Lots of possibilities, but you'll need to do a pressure check first off. Not sure when your last plugs and coils were replaced?

There are number of tire size calculators available on the web.  These give theoretical comparisons and ratios.  It is best to measure the actually rolling diameter of each wheel/tire as inflated.  Porsche recommends less than 2% difference front to back.  Consensus is to have the front tires the larger of the two.

Realize that unless it is a Porsche specific tool (PST2, PIWIS, Durametric), some codes may be difficult to ascertain or reset.  Hopefully your indy has a PST2 or PIWIS if they work on Porsche.

After you get the appropriate codes, there is a grocery list of things to check.  Typically, coils and plugs are the culprits, but since you just had them changed...make sure they were installed correctly and gapped correctly....swap out the ones that are misfiring with ones that aren't?...Did you do a pressure check?  Wastegate, N75 Valve....

Other than the tune, could you please provide more info on your car?  What other mods are there?  When was the last time you changed plugs/coil packs?  Cleaned the TB? or reset the throttle adaptation?

Best to give Todd a call or email for sure.  My guess is it would still be safe, but whether you get all of the performance you want is another question.

Not sure what "replacement" boost hoses you are using, but you should actually hear a click when they are connected properly.

Of course it's your call.  You might be able to find a used stock intake on ebay or somewhere.  I thought the BMC filter is also lightly oiled.  I can't speak for you, but if it were me, I'd get rid of whatever the heck you have in there.  Two issues with the MAF...potential oil contaminating the MAF or turbulent airflow.  I have used a BMC filter for 15 years with no issues.

23 hours ago, gabbys said:

What will happen if MAF problem occurs pls?

Yes, typically there will be codes.  Sometimes these appear as ABS/PSM codes....but sometimes the car just runs poorly.  In any case you should have the codes read on your car with  Porsche specific code reader (e.g., Durametric, PST2, PIWIS).  Those circular filters tend to disrupt airflow over the MAF causing voltage spikes in the MAF.  Sometimes killing the MAF or sending strange signals to the ECU.

17 hours ago, gabbys said:

Ya im sure thats not the stock airbox. Its an aftermarket one with k&n filter... as long as the y pipe is stock, then its pretty simple that i get the original airbox and fit it in ? Thank you

I don't know how simple it is...not sure what was ripped out to put that monstrosity of an air box in.  I'm kind of surprised you haven't been having MAF problems.

Hmmm.  I'm not sure WTF that is.  That is certainly not the stock airbox.  Sorry to say it looks like quite the hack job to boot.  The Y pipe looks stock.

Glad you got it sorted.

I didn't follow the other thread, but have you checked waste gates or N75 valve?

Lookin' good!!  Watch that front lip...you'll likely hit that a few times to start.  For me upgrading was a personal thing.  I enjoyed reading and talking to guys that know their stuff (Kevin, Kevin, Mark, etc.) and from there made a progression of upgrades.  Oh yeah, a triple black cab.  Enjoy and drive safe.

On 5/28/2018 at 8:26 AM, laalves said:

I could be interested. What about ride height? How much did you lose? In the end it's the equivalent to M030 or IX73 suspension, right?

In terms of ride height, realize stock heights vary depending on US vs. ROW.

Front (target mm):  US = 158, ROW=138, X73=128

Rear: US=163, ROW=153, X73=133

The Euro version PSS9's I had installed (due to stiffer springs because I have a Cab) dropped the front 22mm and the rear 20mm...of course this is from US spec heights.  You could probably lower it more, though I have read about issues with trying to go GT2 height.

The ride is significantly better in every way IMHO.

I don't know the model, MY of your car, but I installed Bilstein PSS9's many years ago and have been very happy with the ride.  No PSM issues at all.

Lose the V-flow (V-blow).  I tried it and lost 2 MAFs.  Went to a Sportec intake and haven't lost a MAF since.

I would check the immobilizer...I think it's under the drivers seat?