Periods of very loud rockers OM642 then turbo shut down.
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Joined: Apr 2012
Posts: 139
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From: Space Coast Florida
2008 E320 Bluetec
Periods of very loud rockers OM642 then turbo shut down.
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.
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From: Montreal/Cape Coral FL
2012 X6 35i Sport, 2013 ML 350 BT, 2019 4Runner TRD Pro, 2020 CRV-AWD
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.
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From: V E G A S
1922 Ford Model T / no OBD
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.
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.
Thread Starter
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Joined: Apr 2012
Posts: 139
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From: Space Coast Florida
2008 E320 Bluetec
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.
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.
Last edited by IBelieve; May 25, 2019 at 02:16 PM.
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Joined: Jan 2009
Posts: 9,225
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From: V E G A S
1922 Ford Model T / no OBD
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.
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.
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Thread Starter
Member
Joined: Apr 2012
Posts: 139
Likes: 8
From: Space Coast Florida
2008 E320 Bluetec
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?
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?
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Joined: Mar 2019
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Ml350 bluetec
Member
Joined: Mar 2019
Posts: 145
Likes: 14
Ml350 bluetec
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.
So I wouldn look for something that reduces your torque. Or would trigger a limp mode if that what it feels like.
Thread Starter
Member
Joined: Apr 2012
Posts: 139
Likes: 8
From: Space Coast Florida
2008 E320 Bluetec
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.
Thread Starter
Member
Joined: Apr 2012
Posts: 139
Likes: 8
From: Space Coast Florida
2008 E320 Bluetec
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.
Member
Joined: Mar 2019
Posts: 145
Likes: 14
Ml350 bluetec
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.
