2011 Cayenne 3.0 TDI - Reduced Engine Power Under Full Throttle - Anyone Had This?
Hi all,
I’m hoping someone has come across this before.
I have a 2011 Porsche Cayenne 958 3.0 TDI V6 (245bhp) with around 127,000 miles.
The car drives perfectly most of the time, but if I floor it, for example accelerating hard onto a motorway slip road or overtaking, it will suddenly go into Reduced Engine Power and the coil/glow plug warning light comes on. The engine is then limited to around 2,000 rpm.
If I stop, switch the ignition off and restart it, the car drives perfectly again until I give it full throttle.
Other symptoms:
Slight hesitation/judder when crawling in traffic at low speed.
Occasionally the 2nd to 3rd gear change feels a little odd, but all other gear changes are fine.
No noticeable black or white smoke.
Starts first time every time.
No rough idle.
MAF unplugged gives the expected engine warning, but the full-throttle limp mode still seems to be a separate issue.
Generic OBD scanner isn’t showing an obvious engine fault that explains the limp mode.
So far I’ve been thinking along the lines of:
Boost leak.
Turbo outlet hose.
Intercooler hose or O-ring.
Turbo actuator/vacuum issue.
MAP sensor.
Has anyone had these exact symptoms on a 958 3.0 TDI? If so, what was the actual fix?
I’d really appreciate any advice before I start replacing parts.
Thanks in advance!