Don’t know about 87s, but earlier models had issues with electrolytic caps in the tach that dried out.
Have you popped the cluster and taken a look around? Dan > On Jul 11, 2015, at 7:17 PM, Fred Moir via Mercedes <mercedes@okiebenz.com> > wrote: > > Calling all genii.My 1987 300TD had an intermittent rev counter(Tachometer) > that has since died.The signal would cut in and out making the car lurch at > idle, ~500 rpm to 650 rpm.The signal pickup has 4.5 ac volts at idle and > climbs when the throttle is increased.The OVP relay has been substituted with > a known good and a new one, no change.Swapped the KLIMA for a known good one, > no change. The ECU computer was also tried with a replacement, again, no > change, still dead.As the intermittent signal supplies both the instrument > and the Idle speed control, I can only assume that the signal is going > missing before the common point.Any one have any ideas as to where to look > for bad connection/broken wire/gremlins/vegas (?) ?Fred. > > Fred Moir.Lynn MA.Diesel preferred. > _______________________________________ > 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
