Thread: Secondary turbo problem (potential)

Be aware there is a front actuator and a rear actuator as such. One blocks off the intake to the secondary turbo and the other the exhaust. I’ve had the exhaust one replaced on my car previously and yes, restricted performance was noted.

Many things cause it though and an actuator I thought did record faults that pointed to it? The other one is a leak. That normally reports as a P006a algorithmic failure (the air into the engine doesn’t match the expected MAP sensor value). I’ve got this now and it’s the throttle body unit has cracked where it splits into the y feed to the left and right intakes. It’s not uncommon to get a cracked intake manifold. Have they done a smoke test to confirm there are no leaks in the intake somewhere?

Maybe seek another opinion?

Don’t you love the “body off let’s start replacing stuff” knee jerk response... there’s been quite a lot of money saved recently by aurlorians who’ve found split hoses or sticky actuators from what I’ve read and experienced.

Found a sdv6 3.0 d4 today where someone hadn't fitted the intake adapter to the throttle body correctly. It had popped half off and had actually touched the fan blades under boost...and yes was limping when pushed hard...

Jc

Was the isolation valve replaced or the solenoid that operated the vacuum chamber on the isolation valve replaced?

Are you sure that no DTC is stored? Any trigger for restricted performance including a malfunctioning turbo would be expected to store a code.

Suggestion - buy yourself a diagnostic code reader specific to your vehicle (eg the IIDtool) so that you can read any codes before switching off the engine, not that faults triggering RP are normally cleared on restart.

Originally Posted by Graeme

Was the isolation valve replaced or the solenoid that operated the vacuum chamber on the isolation valve replaced?

Are you sure that no DTC is stored? Any trigger for restricted performance including a malfunctioning turbo would be expected to store a code.

Suggestion - buy yourself a diagnostic code reader specific to your vehicle (eg the IIDtool) so that you can read any codes before switching off the engine, not that faults triggering RP are normally cleared on restart.

Yep need a Diagnostic tool. LR tells me no fault shown..or specific... seems like something left behind by a cow.

Solenoid was replaced at $415

Ouch! The solenoid is mounted at the top front of the engine so easy access but perhaps quite some time was incurred arriving at the conclusion. However LR published a procedure to test for a faulty solenoid or vacuum chamber which only takes a few minutes disconnecting and reconnecting a vacuum hose with the engine idling. Obviously the test wasn't done otherwise the solenoid would not have been replaced because it would have passed the test.

Find an independent LR workshop that is prepared to discover the real cause.

Or perhaps the $415 "solenoid" is actually the complete solenoid actuated isolation valve? Sometimes parts descriptions in the database are poor or obscure and you did mention "actuator" in the original post. Basically you don't have enough information to make more than a semi-educated guess. Maybe some troubleshooting diagnostics were undertaken, maybe not. Again, you haven't listed much to go on. For example, my recent restricted performance event that produced the same codes as the classic sticky secondary isolation valve was only a fault inlet hose. I would be asking a lot more questions and nothing beats being armed with knowledge yourself. The dealer's diagnostic & fault finding system is pretty good in my experience so perhaps the process has been poorly explained. Or not, hard to say with what you've described here.

Scott

Originally Posted by gotaflat

Yep need a Diagnostic tool. LR tells me no fault shown..or specific... seems like something left behind by a cow.

Solenoid was replaced at $415

If you do buy an IID tool (you can also find someone local to read your faults), you need to go into settings and change to ‘Pending’ errors to see all of them. By default only confirmed ones show and most Restricted Performance fall into Pending type. Just worth knowing as it took me a little while to work that out myself in the middle of nowhere.