Sounds an awful lot like a blown MAF too...

 

I agree you need to be there, watch, learn and protect your baby.

 

After 2 weeks and they still have not found the issue and I know most if not almost all of that time the car has been in a corner of the shop.

They said that they have pressure tested it many times and now think it is some blockage in the exhaust ! That blockage is holding back the motor/turbo from spooling????

I have been around turbo cars awhile and that has never happened unless it was a blown turbo. I asked him if he thinks it is that and he said no. What physical object can block an exhaust that can cause a sudden lost of power like that? They are going to take down the exhaust and look at the cats etc.

I have this gut feeling that it is something leaking and they are not checking properly via a proper leak test under pressure and not just doing a pressure test from only under the car.

Is there a link were I can see how to do a COMPLETE AND THOROUGH boost leak test that I can bring it to them and make sure they are doing that. I am going to swing by tomorrow, so if I have that it would be great!


Thanks

Bobby Ali

ba

 

It's a shame you have to pay someone to work on your car that has no idea what they are doing. I've found that things don't fix themselves when they sit in the corner by themselves...sorry to hear...good luck....

 

I would say get your car out of there and take it to a different shop. It is nearly impossible for it to be something in the exhaust unless someone physically stuck it in there from the back side or the cats are clogged. Nothing is going to make it through the turbo that could block the exhaust.

I agree that they probably don't know what to do at this point and that is why the car is just sitting there.

 

I have seen that once with blown cats but it would be very easy to diagnose and think if it was this simple they would have found it by now. Keep us posted on this.

 

The part that I feel so helpless is that these cars are such specialty cars and I feel that is where these very few Canadian shops have us by the neck!

I brought it to a well renown Porsche specialist and if they can't fix this, then who can?

Does anyone know another proven Porsche specialist, that works on modified 911's?

Thanks

Bobby Ali

BA

 

Sounds like your turbo is locking up. Take the compressor side hose off and check for play. Maybe the turbo it self is locking in the housing causing back pressure to the motor? Also try someone elses MAF. Did you call EPL?

 

You know I had the same issue it was the Throttle body clamp. You cant boost leak test for it because it only happens on boost. Just for you own sake pull out the Y pipe and check it please. You cant catch all of the boost leaks with a tester I found out this way!

 

Markski. He saved my car bro. I've been driving a Porsche on and off for
20 years and I've owned 8 total and he knows these cars unlike anyone
else. I learned more about the 996TT in one day with him then in the
previous 5 months I researched. I'm sure you know, he's in Chicago.
He will find and fix the problem in 2 days......3 if he has to order parts.

 

+1 on Markski.... I keep him on quick text dial LOL

 

+1 and check wastegate flaps that they aren't bent or getting stuck. It could cause both overboost and not enough boost depending on if stuck closed or open.

 

I am now entering my third week and still now resolutions. They check the cats and the hot side of my turbo's and all seem fine. He also said the wastegates are opening and closing fine.

He said he is going to check the cold side of the turbo for damage (why this was not done at the same time ).

They also said that it might be my ECU and if I can re flash the tune to see if it is that or a bad ECU.

I asked what PSI did you pressure test and he said 6-7psi's. I told them many times before that some boost leaks only show at higher PSI's i.e. a hose lifting or clamp at only higher psi's and hence the leak) 15psi and being my car is supposed to be running 19psi and it is only running 12psi we should at least be testing at 12psi. I told them how in the past on my Supra that this was the case that I would test at lower psi and nothing, but at higher my throttle body coupler would push air out. I have suggested testing at higher PSI's from day one and now that nothing has been resolved I mentioned it again and he thinks that is not the issue. After I asked him a couple of times he said he will try that, but I am not sure if it will really be done. He also said he is not use to Porsche running that high PSI's, and I am like really and this is a performance shop. He said he is use to just flashes about 1 to 1.1 bar.....so I have no idea.

I asked them to check the cold side of the turbo's and test at higher psi for boost leaks again and then we will try to re-flash and see if it is electronically related (I don't think it is hence the reason I am pushing for the for-mentioned to be done first).

It is either my car is obviously not a priority or this is really something hard to diagnose. I just don't understand being these guys work on Porsche's and are supposed to know there stuff.

Guy thank you for all your suggestions so far, I feel I just don't want to think about this any more.....

Thanks

Bobby Ali

ba

 

The cats were the issue!

I am just grateful for this situation being resolved!

One of the cats broke in half stopping the flow completely, being the main culprit and on the other side it was starting to break up.

We just hollowed them out, put O2 spacers and the car IS STRONGER THEN EVER! I am wondering if my cats were on the way out from before this incident and finally when the other side just broke in half completely stopping the flow. The reason I am saying that is usually you pick up about 14-20AWHP over the 100cell cats at my power levels and you can't really notice that difference at this power level. I can feel this power differance and if feels more like a 25-40AWHP bump.

Previously the power would slow down at about 6500rpms to a point I would not even need to look at the tech to shift, now the cat just pulls to red line and with out me looking down I now sometimes hit rev limiter.

My Speedtech exhaust went from a great sounding exhaust to an AMAZING sounding and the higher up in the RPM band that AMAZING sound becomes exponentially better!

Again, I would like to thank everyone for there advice and support!


Thanks

Bobby Ali

ba

 

Same shop? They told you a week ago that the cats were good, no? Were these stock cats or aftermarket cats? Glad you got it fixed.