E350 cdi w212 2010 tick over varies

[sensor555]

Hi all, wonder if anyone knows the reason for various tick over speeds on my E350 cdi. on start up ticks over at 650rpm, nextime coming to a halt it will be at 750rpm then back to 650rpm. Is this normal, is it performing some operation to increase rpm? Thanks.

 

[bembo449]

cars vary there idle depending on many things , like air con running , I wouldn't be concerned if its only a small amount pal

 

[KennyN]

Had similar with my CLS , it was down to the battery charge state or load.

If the car thinks the battery is struggling at idle with it's current load it will increase tick over to compensate.

K

 

[sensor555]

cars vary there idle depending on many things , like air con running , I wouldn't be concerned if its only a small amount pal

many thanks for reply

 

[sensor555]

Had similar with my CLS , it was down to the battery charge state or load.

If the car thinks the battery is struggling at idle it will increase tick over to compensate.

K

many thanks for that.

 

[Michael168]

Hi all, wonder if anyone knows the reason for various tick over speeds on my E350 cdi. on start up ticks over at 650rpm, nextime coming to a halt it will be at 750rpm then back to 650rpm. Is this normal, is it performing some operation to increase rpm? Thanks.

I have a 2010 E350 CDi and mine does this. The idle speed rises when it is doing a DPF regeneration. On mine it rises to about 900 rpm and the gear change happens a lot later than normal.

 

[sensor555]

I have a 2010 E350 CDi and mine does this. The idle speed rises when it is doing a DPF regeneration. On mine it rises to about 900 rpm and the gear change happens a lot later than normal.

Many thanks for that info