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