Re: [MBZ] '87 300TD rev counter.

2015-07-13 Thread Max Dillon via Mercedes
Curly, 

The plug on the top of the IP is the rack position sensor, nothing to do with 
idle. It has a locking ring that needs to be turned to allow removal.

There is a small two pin connector at the back of the IP, between IP and cruise 
control actuator, which is for idle.  Pinch to release.
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300

On July 13, 2015 12:00:18 AM EDT, Curly McLain via Mercedes 
mercedes@okiebenz.com wrote:
(I think EDC is the book term for the 
electronic idle speed control plug on the top of the IP.)  

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Re: [MBZ] '87 300TD rev counter.

2015-07-12 Thread Curly McLain via Mercedes
No, that one is for diagnostics, specifically setting the injection 
timing with the dynamic tool.


The one for the idle speed/tach is on the rear of the engine reading 
off the flywheel.


Peter


Interesting.  Thanks again.  We have a  87 124 300D that has a 
completely wacko idle.  Everything I've tried makes no difference.  I 
think the tach also goes wacky with the idle.  But when I unhook the 
idle speed electric connector on the pump it does the same wacky idle 
thing.I never thought of looking at the tach/instrument cluster 
as Dan suggests.


Is there some other connection between the hall effect 
sensor/tachometer to the throttle or idle speed control that would 
work with the EDC unhooked? (I think EDC is the book term for the 
electronic idle speed control plug on the top of the IP.)  It sounds 
like a flakey signal from the sensor would cause this, but I don't 
understand how it could work with the plug on top of the IP 
disconnected.


Next time I see the car (probably 6 months) I will look for this 
sender and connector at the rear.


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