W124 cruise control and idle speedv

[K1100]

My 320TE has the following issue. Occasionally I will find that the cruise control is not operating. I now know from experience that whenever this happens, I will also find that the idle speed in neutral has gone up to 1200 rpm. So far, turning off the ignition and restarting resets both back to normal. I have found references on the forum to idle speed problems and ABS light being caused by the OVP relay but no reference to exactly my problem. Does anyone have any thoughts please?

 

[K1100]

My 320TE has the following issue. Occasionally I will find that the cruise control is not operating. I now know from experience that whenever this happens, I will also find that the idle speed in neutral has gone up to 1200 rpm. So far, turning off the ignition and restarting resets both back to normal. I have found references on the forum to idle speed problems and ABS light being caused by the OVP relay but no reference to exactly my problem. Does anyone have any thoughts please?

Problem solved by Warringtons of Warwick, Bosch agents. Leaking air pipe to inlet manifold; one failed ignition coil, and a set of plugs and plug leads. Now running perfectly.

 

[DREAMER NO2]

K1100 Thank you for letting others know, to sort out further problems like yours.

 

[LostKiwi]

It will most likely have been the vacuum leak as cruise on older cars uses vacuum to operate.

Thanks for the heads up.