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#1
11-24-2010, 12:53 AM
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m103 Low idle
Hey guys,
Have an interesting problem with my 1988 300CE m103 idle. it starts fine and idles around 1000 to 900 rpm in park when cold. BUT...when fully warm the idle goes down to around 600 in park and 500 in drive drives ok and idles nicely in drive but if i shift it back to park or neutral the idle stays around 500 as if nothings changed! (lots of shuddering and lumpy idle) I have changed all the vacume lines including the boot for the air flow meter, have tried a couple of well cleaned ICV valves (new vacume lines) the cap rotor and wires are around 2 years old. the coil is brand new. Temp sensor is brand new. have checked the OVP relay and since cold start is fine i assume its ok. Crank shaft sensor gives me a reading of 947ohms which is within range. I'm at a complete loss as to what is causing the problem. Any ideas? Thanks in advance. 
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#2
11-24-2010, 12:12 PM
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I wouldn't say your idle is worrisome. My 103 idles in a range of 550 to about 700, depending on load, weather and other ambient conditions.
__________________
1988 California version 260E (W124) Anthracite Grey/Palomino Owned since new and still going strong and smooth MBCA member Past Mercedes-Benz: 1986 190E Baby Benz 1967 230 Inherited from mom when she downsized 1959 220S Introduced me to the joys of keepin' 'em goin' There are only 10 kinds of people in the world--those who understand binary and those who don't
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#3
11-25-2010, 02:48 AM
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thanks for the reply. the thing is it used to idle around 800 but just changed to low idle without any other indication. and its pretty lumpy in park (smooth with a slight shudder occasionally in drive). Changed all the 'usual' things like idle valve temp sensor ect thinking it was some kind of sensor failure. The duty cycle fluctuates around 50% at idle and 45% at 2500 rpm. the engine mounts are about a year old.
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#6
11-25-2010, 04:56 AM
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Is there power and ground to the ICV when this occurs? Is there any change in the idling, when this occurs and you disconnect the ICV?
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#8
11-25-2010, 08:49 PM
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Quote:
got that on mine
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#11
11-28-2010, 06:42 AM
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I kind of have the same problem..mechanic told me that it could be the electrohydraulic
actuator that is giving me a rough idle while stopped in "drive". This does not happen all the time though,mostly when exiting the freeway and coming to a stop. My indie checked current on the EHA and found it to be low ..I probably need to get a new one or scrounge one from the yards, luckily this part is shared with many 300 series and 190 2.6 series I believe .. I hope to have a new or used replacement soon, and see how it works . Lots to learn about these fuel systems ..I will look forward to your next posts to see what results you get ... Thanks css190e 2.6 180k/daily driver/ "it's always something"
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#12
11-28-2010, 01:07 PM
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Checking the current on the EHA only tells you it is compensating the mixture, it has nothing to do with how it is functioning in relation to needing a new one. It is simply telling you the system is running too rich/lean and the EHA is adjusting for it. Sounds to me like it is doing it's job
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#13
11-28-2010, 02:07 PM
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Check the throttle switch and decel microswitch.
__________________
 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#14
12-02-2010, 06:48 PM
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On mine it was the...
Little rubber elbow that goes between the valve cover and the cylinder head located in the middle of the valve cover by the air filter. Mine was old, brittle and cracked and it idled fine when replaced.
__________________
5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots) 5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others) 5 speed '01 Jetta V6 (new wifes car, pretty quick) 5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k ) 5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest) 0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)
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