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2005 E320 CDI Turbo Problem?

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Former Member
Garmon's picture
Coventry, CT
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2005 E320 CDI

When my vehicle is first started (cold engine) it operates normally, including ability to wind the RPMs past 3000 (in sport mode) and the car is quite peppy.

Within 10 minutes or so, RPMs will not wind past about 3000 RPMs and it just dogs it at that point. Same is true in comfort mode.

Mechanic has checked it and initially found a loose air line and a code indicating the loose air line. Loose line was fixed but did not solve the problem. New code he says, is pointing him to believe the turbo charger is shot. However, he is waiting for more experienced tech to return from vacation (next week). In the meantime I am driving it and living without the pep.

Can anyone provide insight or advice? I could really use it. I had a similar problem with my 98 E300, but that turned out to be nothing more than carbon buildup in exhaust system, which was an easy fix. Thanks.

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Re: 2005 E320 CDI Turbo Problem?

Limp mode to protect the engine/turbo. They need to inspect all the air boots as well as the intercooler tank ends for leaks.

VNT turbos are very susceptible to carbon buildup on the vanes. If you "granny" the car its more likely to carbon up and stick open or not open enough to control boost. Giving the engine a good power run every few weeks to burn out the carbon, an Italian Tuneup, will help keep the turbo and engine healthy.

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1982 300D Holset HE221W turbo, 7mm M-Pump, A/W intercooler, W/M injection
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Former Member
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2005 E320 CDI
Re: 2005 E320 CDI Turbo Problem?

Thanks a lot for this info. Any idea why it has plenty of pep when "cold", but loses the pep when hot?

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Re: 2005 E320 CDI Turbo Problem?

The computer needs time to gather/compare data.

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AKA, ForcedInduction. ASE certified master technician.
1982 300D Holset HE221W turbo, 7mm M-Pump, A/W intercooler, W/M injection
1980 240D 3.0T OM617a, 4-speed manual, 3.07 diff

nhdoc (not verified)
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nhdoc's picture
Re: 2005 E320 CDI Turbo Problem?

Try shutting it off and restarting once it is in the limp mode and see if you can get it to reset that way.

My guess is the VNT actuator is sticky and your car is overboosting which causes it to go into limp mode. I'd be looking at the actuator and its associated controller.

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Re: 2005 E320 CDI Turbo Problem?

It might be more than the turbocharger. I lost my turbocharger and my cruise control a couple of years ago due to a bad stop light switch. It didn't seem to affect highway speed at all without the turbo -- it affected only the time to get to speed.

Ed Schwab
98 E300dt

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Re: 2005 E320 CDI Turbo Problem?

My 2005 E320cdi developed a similar problem about a year ago. The culprit was a bad EGR valve.

Turbo would not kick in, low RPMs, did not want to downshift - and occurred usually after car had gotten warmed up.

And of course, was not covered by the extended warranty I had purchased.

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2005 E320 CDI
Re: 2005 E320 CDI Turbo Problem?

I just got the diagnosis (which is based on a recheck of all the codes and a number of electrical tests - but no clearly stated effort to visually/manually check air hoses etc). They have concluded the turbocharger needs to be replaced. I am having difficulty embracing this, given the volume of info that suggests it is frequently something else that is less dramatic.

As such, I am debating getting a second opinion elsewhere. Good idea, or should I just bite the bullet and quit wasting time?

Thanks again for all the feedback.

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Re: 2005 E320 CDI Turbo Problem?

As such, I am debating getting a second opinion elsewhere. Good idea, or should I just bite the bullet and quit wasting time?

ALWAYS a good idea when there are so many possibilities....

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Re: 2005 E320 CDI Turbo Problem?

Always get a second opinion whenever possible. And specifically state you want the turbo and hoses visually inspected and not just "computer diagnosed".

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AKA, ForcedInduction. ASE certified master technician.
1982 300D Holset HE221W turbo, 7mm M-Pump, A/W intercooler, W/M injection
1980 240D 3.0T OM617a, 4-speed manual, 3.07 diff

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Re: 2005 E320 CDI Turbo Problem?

Stygimoloch;201512 wrote:
Always get a second opinion whenever possible. And specifically state you want the turbo and hoses visually inspected and not just "computer diagnosed".

A second opinion is a good idea prior to major work certainly. But if you have so little confidence in the shop that you feel a need to get a second opinion all the time, find a different shop. Your time has a value.

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Re: 2005 E320 CDI Turbo Problem?

not benz related but

i had a 2006 ford van with a 6.0 powerstroke diesel.

hit and miss problems loosing power, egr cleaned several times, then replaced, the problem still existed...

finally after 7 weeks,:Wall: i took it to another dealer, they fixed it .... bad turbo......in 2 days....which the original selling dealer said, it s not the turbo....

van ran like a scalded cat.... better than even when brand new..

i believe the 2006 powerstroke used the vnt design turbo also.

i would ask your shop, if you replace the turbo and the problems are not corrected, do i have to pay ???

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