Hunting While Driving

[stumpy1981]

Hi Everyone,

Got a problem at the moment with the w203, when it's warmed up it starts to hunt/surge while driving at a constant speed with light throttle. Just wondering if anyone has had a similar problem?

Also when cold and when the gearbox is 'C' it quite harshly changes from 2nd to 3rd. Don't know if this could be related as well.

Thanks

 

[renrutp76]

May be an issue with low transmission fluid, other than that it may be a torque converter problem. You can buy a dipstick from eBay, the dip tube is at the rear left of the engine bay, usually with a red plastic cap over it.

Good luck

Sent from my SM-G930F using Tapatalk

 

[Westheath]

Irregular RPM on the transmission is usually the torque convertor.

And as stated already stated above check fluid level.

 

[stumpy1981]

Cheers guys. Had the fluid check today and it's ok. So looks like I'm going to have to price up a new torque converter then.

 

[Doug1234]

I fitted a new speed sensor plate to my 97 e300td, symptoms were
Rough gearchanges esp 2-1 ( 5mph in traffic /thumping into gear.
Up changes under full throttle would need me to release throttle off a bit to get it to change up.
Jumping back and forth between 3-4 under hard throttle.
And the bit that may be relevant to your situation is that with engine idling and W mode selected on gearbox the engine would hunt up and down, but only on idle and this stopped after sensor plate was changed.

 

[Westheath]

The clue is:
"when it's warmed up it starts to hunt/surge while driving at a constant speed with light throttle"

Its usually @ 1250 rpm you can see the rev counter going up and down on slow cruise.

 

[Flashstanlee]

Hi did you resolve this