Sound popopp at 5K rpm, stuck and like rev limited, boost is going fine, could hit 0.7 bar. Bone stock with a fabspeed 100 CELL exhaust, code on secondary air pump but seems not the affected on this, any idea? Thanks

 

Update is, smoothly pedal can rev over 5K, but floor WOT it it stucks...

 

Poss plugs & coils breaking down under full boost.When was last spark plug change ?

 

Plugs changed within 2000 miles, but I notify this issue before plugs change, and plugs didn't help...

 

is the car stuttering at 5k?
maybe maf... a boost leak...
when did this start to happen... did you change or add anything right before that?

 

Yes, the car stuck at 5K when WOT like having rev limiter, but smoothly pedal it can rev over 5K....

Today have cleaned the MAF but no luck, and reset the car by unplug the battery, seems it is not the issue.

For the leak, workshop found the O-ring on the lower Intercooler Hose maybe not tighten enough, seen some oil on the O-ring and gap, will try to replace it to see if any improvement.

Actually I just bought the car for few months, I did see this happen but not so often until have the exhaust changed, I guess maybe boost climb up fast and make the issue more significant...isnt it? Thanks

 

Seems like you inherited a problem and now its on you to find it... you need a really good set of eyes on the car... someone that has been around them for a long time...

 

Coils changed too? ign coils can go bad without any visual signs,but prob. best to get it to a porsche familiar shop

 

So it more looks like coils going back than leak right?

 

Yes, and it is not affecting any on driving it until you floor it right away...

 

Sounds like a spark prob. to me,but many things also can cause similar symtoms.I take it no coils were replaced.Best thing to do is take it to a good porsche familiar shop

 

Another update, I can drag it although feeling a bit hesitate in btw 3-4Krpm, but can rev over 5Krpm, but if I shift down like from 4 to 2, it stucks at 5K rpm then....

 

Am I right in saying you haven't changed your plugs and set the gap to 0.6 to 0.65mm.
If not stop, wasting your own time and get them done. Your describing classic worn plugs/ gaps too big.
Please let us all know once you change them. If you still have the same problem then your posts has just become very very interesting.
Fingers crossed thats what it is.

 

My spark plugs had been changed and ran not over 2000 miles until now, but before changing them, I have seen the same issue actually too.

 

Sounds like my car before I replaced plugs/coils (replaced coils with 997 replacement part#).