IBelieve

Greetings all. In mornings with the engine near running temp, after coming to a stop after a 45 MPH then slowly accelerating, the rockers sound very loud and then the turbo shuts down. I have to shut off and restart to get the turbo back. Could the turbo sticking on and If so, could the actuator be the problem? I have the GDE Eco tune and the EGR disabled shut. Swirl flaps disabled also.

IBelieve

Happened 3 times with no codes. But I remember having an "Over boost" code back when my EGR was giving me problems.

peter2772000

How can you tell that your turbo "shut down"? As well, I doubt that a turbo could seize up and then simply start turning after a simple restart.

kajtek1

Where there is a limp, it has to be a code.
I don't remember if $4 OBD plug will give you boost pressure, but $150 iCarsoft definitely will.
Knowing total mileage and mileage since EGR and intake flaps cleaning could help us in guessing.

IBelieve

Thanks for your input guys.
The car has 135K miles.
Just did the tune with deletes last week.
I cleaned the EGR but not the intake flaps.
I say the turbo shuts down as in electroically not adjusting the fins, not seized because the car loses maybe 80 percent of its power and acts like it's a very small engine. It drives fine but has very little pickup. If doing 65 it will maintain 65 but bearly accelerate. I have an Actron Auto Scanner CP91865 and I am working on how to get readings for the turbo boost.
One more point of drivability is that at almost any acceleration level the power is not smooth. It surges more and less throughout the RPM range. But is smooth at a steady cruise.
I have checked all 3 times it did it and there were no codes or pending codes.

kajtek1

You need to drive with live data to figure out what is happening.
I rebuild turbo on this engine at 180k miles while doing other jobs and there was nothing wrong with the turbo.
Meaning I would not expect the fins to get that much carbon to freeze them at your lower mileage,
Than you never know.

Towmater

Well the tune might effect the ability to throw a code.

When was the air filter replaced?
When was the fuel filter replaced?

Happened to me a while ago and it was the fuel filter.

IBelieve

Just replaced the air and fuel filters last month. Did the fuel filter cause the surging?

Towmater

Well that are are lots of things that can cause it. Really a good scanner is helpful to pull the mb codes.

It sounds like It's going into limp home mode. Question is why and a scanner helps.

IBelieve

Not limp home mode, still drives fine but little power untill I cycle the ignition.
All the same problems persist. No codes or pending codes on the ICarsoft MBII.
But almost daily the turbo stops working after an acceleration where I can hear the engine diesel sound clearly louder. Then acceleration power drops down dramatically.
Regular acceleration is not smooth but has slight to moderate surging.
Transmission 1 to 3 shifts are smooth half the time and the other half the time abrupt.
When I come to a full stop, 1 to 2 seconds later the engine stumbles loosing 150 RPM or so then over compensates and surges momentarily. If I am not at a firm brake pressure, it actually moves the car.
I'm thinking it's time for a Starr diagnostics. Any ideas?

Towmater

Not obd codes, but codes from the canbus modules themselves.

When you watch intake manifold pressure while driving how high does it go? Is ther any correlation to the sound?

Towmater

Ah, the tune. That probably deleted some maps as well, so you are less likely to get codes. I recently had a similar issue and it turned out to be limp home but no codes since I had a tune. Turned out to be my radiator fan wasn't working.

So I wouldn look for something that reduces your torque. Or would trigger a limp mode if that what it feels like.

PSDCampervan

There are 2 types of LMH, one that prevents engine from revving above 3k in N & one that prevents transmission from shifting above 3rd gear.

IBelieve

Found my EGR was still working. But not correctly.Talked with GDE tech. Suggested re-flashing. Worked wonders. Most all problems went away. But now the turbo stops working from time to time just after the loud period of diesel sound. Again suspect the turbo sticking open. Tonight it shut down and I got the code PO299 Turbo under-boost. I will clean all connections (again) and I suspect the turbo actuator is failing to do it's job correctly.

Towmater

Have you disabled your swirl motor yet?

IBelieve

Yes, that was done with the GDE tune.

IBelieve

Decided the turbo actuator was not opening and closing when needed getting "Turbo over-boost" and "Turbo under-boost" codes. So I changed it and my car has never run better. I have put about 100 miles on it from city driving to 1 hour runs and one blast to 110 MPH (to catch up with a flying German car pack) and it runs perfect.

Towmater

Thanks or the update! I wish more people would complete their threads.