Try replacing the actuator under the hood. This device holds the throttle linkage in place so your foot can take a vacation.
http://www.autohausaz.com/search/pn.aspx?sku=11998644-PM-002545863281&vehicle=1986%20MERCEDES%20420SEL%20126.035&brand=Programa%20%28OE%20Rebuilt%29&utm_source=bing&utm_medium=nonpaid&utm_campaign=bingSKU_Mercedes On Tue, Dec 12, 2017 at 1:13 PM, Meade Dillon via Mercedes < mercedes@okiebenz.com> wrote: > From Jim's info on Middle Aged Mercedes Electronics Repairs: > > "Cruise control amplifier: (The VDO system has the familiar column stalk, > the Philco/Ford system has a dash-mounted rocker switch.) The system will > accelerate when you hold the stalk, but won't hold speed. Other symptoms > can also be caused by the amplifier, but the above is pretty definitive. > *Most* cruise control failures at this age are caused by a bad amplifier. > (If there is no mechanical linkage or vacuum failure under the hood. And if > the stalk switch is not obviously damaged.) Another amplifier symptom is > surging speed, often followed by an eventual cutoff. (This assumes that the > speedometer needle is rock-solid. If it is not you probably need a new > speedometer cable, or at least to lubricate the one you have. The 126 cars > have electronic speedometers, there is no cable.) If you pass this > electrical > checklist and the cruise control still doesn't work, then the amplifier is > highly likely to be at fault." > > Sounds like you've got the right place to start. More troubleshooting on > his website if you want to dive in further. > > http://formicapeak.com/~jimc/mamerepairs.html > > > ------------- > Max > Charleston SC > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
