Finland: GLK350 4matic CDI RPM jumps to 800 instead of 500-600
Thread Starter
Newbie
Joined: Jun 2011
Posts: 8
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From: Oulu, Finland
GLK 350 4matic 2010
Finland: GLK350 4matic CDI RPM jumps to 800 instead of 500-600
This happens not often but, sometimes in D/R without pressing accelerator my rpm shows 800 with a mild humming noise when I press brake and the car moves twice as fast as it does in D/R without pressing accelerator. Normally it is arround 500 without humming noise. MB dealer here is Veho in Finland does not know what to do?
Sometimes, while I am driving normally it also jumps and I can hear the humming noise.
Any ideas?
- Ari
Oulu, Finland
Sometimes, while I am driving normally it also jumps and I can hear the humming noise.
Any ideas?
- Ari
Oulu, Finland
Thread Starter
Newbie
Joined: Jun 2011
Posts: 8
Likes: 0
From: Oulu, Finland
GLK 350 4matic 2010
hmm
Any one knows of any email technical service of MB Germany where I can ask about this issue. As a whole I really love this car.
Super Member
Joined: Apr 2010
Posts: 520
Likes: 5
From: Tromsø, 69° 41' N
2010 GLK 220CDI 4M BlueEFFICIENCY
This happens not often but, sometimes in D/R without pressing accelerator my rpm shows 800 with a mild humming noise when I press brake and the car moves twice as fast as it does in D/R without pressing accelerator. Normally it is arround 500 without humming noise. MB dealer here is Veho in Finland does not know what to do?
Sometimes, while I am driving normally it also jumps and I can hear the humming noise.
Any ideas?
- Ari
Oulu, Finland
Sometimes, while I am driving normally it also jumps and I can hear the humming noise.
Any ideas?
- Ari
Oulu, Finland
His own assessment of the case, engine below operating temperature, concluded with (which he could demonstrate empirically) two factors leading to the raise of rpm:
1. Turning the Automatic Climate Control (ACC) from off to on, with other loads like seat heaters, rear window heater etc. turned off.
2. Regeneration of the Diesel particlefilter
"Testing" at operating temperature, 90°C, he didn't get the symptom.
The OP forwarded request(s) to his dealer, and finally got answers, which in short (from German) goes:
1. Dependent on the engine coolant temperature and selected Auto mode of the ACC (or "Manual mode" and air flow 1 or higher), is the electrical heater of the diesel engine activated.
2. With increased current load(s) will the engine get a signal to increase the rpm.
3. As well can the rpm raise during the regeneration of the particlefilter.
Maybe you should bring these statements to your dealer and note their (any) response?
The OP as well forwarded his questions/concerns to "a higher level" in the MB system, as he, like you, regard the raise of the rpm being a safety issue. The response from MB was the one from the dealer.
Regards
Thread Starter
Newbie
Joined: Jun 2011
Posts: 8
Likes: 0
From: Oulu, Finland
GLK 350 4matic 2010
An issue, regarding a GLK350 CDI, was subject to a discussion on a German GLK forum early 2010. The "Themenstarter" (OP) noted his GLK jumping from 600 - to 800rpm, apparantly not caused by any "drivers action".
His own assessment of the case, engine below operating temperature, concluded with (which he could demonstrate empirically) two factors leading to the raise of rpm:
1. Turning the Automatic Climate Control (ACC) from off to on, with other loads like seat heaters, rear window heater etc. turned off.
2. Regeneration of the Diesel particlefilter
"Testing" at operating temperature, 90°C, he didn't get the symptom.
The OP forwarded request(s) to his dealer, and finally got answers, which in short (from German) goes:
1. Dependent on the engine coolant temperature and selected Auto mode of the ACC (or "Manual mode" and air flow 1 or higher), is the electrical heater of the diesel engine activated.
2. With increased current load(s) will the engine get a signal to increase the rpm.
3. As well can the rpm raise during the regeneration of the particlefilter.
Maybe you should bring these statements to your dealer and note their (any) response?
The OP as well forwarded his questions/concerns to "a higher level" in the MB system, as he, like you, regard the raise of the rpm being a safety issue. The response from MB was the one from the dealer.
Regards
His own assessment of the case, engine below operating temperature, concluded with (which he could demonstrate empirically) two factors leading to the raise of rpm:
1. Turning the Automatic Climate Control (ACC) from off to on, with other loads like seat heaters, rear window heater etc. turned off.
2. Regeneration of the Diesel particlefilter
"Testing" at operating temperature, 90°C, he didn't get the symptom.
The OP forwarded request(s) to his dealer, and finally got answers, which in short (from German) goes:
1. Dependent on the engine coolant temperature and selected Auto mode of the ACC (or "Manual mode" and air flow 1 or higher), is the electrical heater of the diesel engine activated.
2. With increased current load(s) will the engine get a signal to increase the rpm.
3. As well can the rpm raise during the regeneration of the particlefilter.
Maybe you should bring these statements to your dealer and note their (any) response?
The OP as well forwarded his questions/concerns to "a higher level" in the MB system, as he, like you, regard the raise of the rpm being a safety issue. The response from MB was the one from the dealer.
Regards
Thanks a lot!!!
Super Member
Joined: Apr 2010
Posts: 520
Likes: 5
From: Tromsø, 69° 41' N
2010 GLK 220CDI 4M BlueEFFICIENCY
Olkaa hyvä! 
PS. I take it the nice market downtown is now closed for the season, if it's still being held there.
PS. I take it the nice market downtown is now closed for the season, if it's still being held there.
Last edited by GLKKa2H; Sep 23, 2011 at 05:46 PM. Reason: downtown typo
Thread Starter
Newbie
Joined: Jun 2011
Posts: 8
Likes: 0
From: Oulu, Finland
GLK 350 4matic 2010
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Newbie
Joined: Mar 2014
Posts: 10
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From: Toulouse
glk 350 cdi
This happens not often but, sometimes in D/R without pressing accelerator my rpm shows 800 with a mild humming noise when I press brake and the car moves twice as fast as it does in D/R without pressing accelerator. Normally it is arround 500 without humming noise. MB dealer here is Veho in Finland does not know what to do?
Sometimes, while I am driving normally it also jumps and I can hear the humming noise.
Any ideas?
- Ari
Oulu, Finland
Sometimes, while I am driving normally it also jumps and I can hear the humming noise.
Any ideas?
- Ari
Oulu, Finland
sorry, haven't read all the post, i have the same thing, it is normal condition when the particle filter is in recycling mode. often or not, depend of your driving quality, i mean, the kind of road you use to drive, small or hight speed road
brgds
