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M103/190E Twitching Idle and Error Code 29
Hello,
It has gotten quite cold here in socal and my 1993 190E 2.6 is having some odd problems. I noticed just starting today after work that my car doesnt idle anymore. The tachometer twitches like crazy from 500-1500 rpm, engine feels rough, and I hear an odd clicking noise coming from EZL/ABS area. Engine will also stall on its own randomly in this state. I replaced the OVP with a spare that I had (first instinct) and the problem still exists. I checked the blink codes and I am getting error code 29: Code:
29 Difference In Coolant Temperatures Between CIS-E Control Unit and EZL Ignition Control Unit The coolant temperature sensors (black 4 prong and blue 1 prong) are new from dealer as of august 2010. Interior cluster temperature gauge does not seem abnormal. |
Replaced ECU with spare this morning, twitching tachometer and rough idle still exists.
I do not hear a clicking noise coming from ABS/EZL area anymore though. |
does anyone have any information on what this part plays in idle?
http://img207.imageshack.us/img207/8818/0075422917.jpg Description: Speed Control Sensor; Idle/Cruise Control Impulse Sender at Rear of Instrument Cluster I think this might be the culprit because just recently, I went to adjust my dimmer on my instrument cluster and my electronics flickered for half a second and came back online. engine almost stalled but caught itself. |
Here is a video of my twitching tachometer. This is at idle, engine warm.
http://www.youtube.com/watch?v=hraU0Ho1EWQ |
Looks like the Jetronic brain is going haywire with the data it is receiving.
Pull the plug off the EHA and disconnect the O2 sensor. This will run the car in open loop without any electronic assistance. Does the problem still occur or does the car fail to run? Also double check your resistance of the temp sensor on the head is within spec both cold and warm. |
Quote:
http://img.photobucket.com/albums/v2...g?t=1291235148 I will try to cause open loop condition by disconnecting O2 sensor on my drive home from work. I cannot access EHA so easily without removing airbox. |
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