Temporary complete loss of Turbo Boost ?

[richardc2cab]

Ok so drove the car as normal first thing, took the kids to town, on the way back I had a complete loss of Turbo boost from the moment I turned the car on, no obvious signs. Then stopped the car after 4 miles and restarted and I'm back as normal up to 1.2 Bar, ECU related ??

I'm glad I don't just have a 3.6L standard engine, its not much fun without the Turbos

[Silver_TT]

Could certainly be related to the ECU since that controls the twin turbos. If you're getting 1.2 bar of boost, you must be running an aftermarket flash. Numerous issues can occur when running aftermarket flashes on these cars.

[richardc2cab]

Strange its been fine for years with this set up, anyway driven for an hour again now with several stop starts and its totally back to normal

[wross996TT]

So it is possible for the ECU to shut down the boost when it has reached a pre-programmed limit (like fuel, AFR, etc.). Get the codes read with a Porsche tool and report back.

[richardc2cab]

_{Ok so I have P0153 PC 021 / P1120 PC 117 / P1122 PC 431 with no CEL at any stage, I guess the last 2 codes could be because I am running a throttle Booster unit ??}

Edited March 16, 2014 by richardc2cab

[Loren]

P0153 Oxygen Sensor Ahead of TWC, Bank 2 – Below Limit

 

Possible causes:

- Exhaust system leak

- Oxygen sensor is dynamically inert

 

P1120 Throttle Valve – Signal Implausible

 

Possible causes:

- Open circuit or short circuit in the wiring

- Throttle position sensor faulty

- DME control module faulty

 

P1122 Throttle position sensor 2 - signal implausible, below limit, above limit

 

Possible causes:

- Open circuit in wiring

- Short circuit in wiring

- Throttle position sensor faulty

- DME control module faulty

[richardc2cab]

tx. Loren your thoughts though as I have no CEL and its completely fine now ?

[Loren]

If the codes have cleared (have not returned and are not pending) then the problem cured itself -- for now.

If it were my car I would still do some inspection and checking.

I would check for exhaust leaks (broken bolts or damages), I would clean the electrical connections on the throttle valve sensor and if you have not cleaned the throttle body recently I would do that to.

Make sure everything is clean and tight and you should be good - barring a rare throttle sensor failure.

[superboyg]

Sorry for bringing up an old topic, I got exactly the same symptom and codes tonight, throttle body was replaced half an year ago for the throttle issues before.

 

May I ask whats the find out finally? Thanks