Cruise control with a mind of its own

[Bud]

It seems OK under 70mph but anything over it disengages after about 2 secs, it used to be fine. Any ideas please.

 

[thebook]

You haven't engaged the speed limiter by mistake? On the same stalk.

 

[Bud]

Its a 1997 E200 not sure if its got one !!!

 

[Ted]

Wrong size wheels/tyres?

 

[Shude]

It's usually down to rolling radius of tyres, front vs rear that causes this.

 

[Brian WH]

It's usually down to rolling radius of tyres, front vs rear that causes this.

Yup, none standard tyres is the answer.

 

[DuFFmAn]

Is it a manual? Could be your clutch slipping?

 

[stevesey]

It's usually down to rolling radius of tyres, front vs rear that causes this.

Or side to side - mine started disengaging at 75mph after I put an almost fully treaded spare on the (more worn) passenger front whilst using up the last bit of tread on the drivers side.