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  #1  
Old 03-25-2015, 02:21 AM
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Question More M103 rough idle problems.....WHY???

This is becoming a constant nightmare. First it clears up for months and then it returns. On and off, same thing. Its not even a continuous problem as it will completely go away on certain days. The car will idle rough, and have a slight stumble/hesitation on acceleration from standing. Here is the list of things that have all been done:
Spark plugs replaced today
Valve stem seals replaced last week
Oil/oil filter changed last week
Coolant flushed/changed last week
Was getting Error code 12 for EZL, replaced this week. code is now gone.
O2 sensor replaced 8/2014
Radiator replaced 7/2014
All radiator/coolant hoses replaced this year
Voltage regulator replaced 7/2014
Fuel filter replaced 8/2014
Fuel pumps replaced 7/2014
Distributor cap replaced 3/2014
Ignition rotor replace 2014
Spark plug wires replaced 1/2014
Throttle body gasket replaced last week.
Both IACV hoses replaced 3/2014
IACV tested ok 2015
O2 sensor tested ok 2015
Vacuum hoses replaced 2014
Alternator upgrade to 120 amp 6/2013.

Not receiving any check engine codes other than code 11 for secondary air injection (disconnected smog pump). I checked the duty cycle and the readings fluctuate rapidly between 45% - 55% per the ke-jetronic write up. There was a nice puddle of oil in the intake manifold after I removed the throttle body. Once the valve stem seals were replaced, all is dry now. Anyone got any suggestions?
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Old 03-26-2015, 04:27 AM
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M103 rough idle/hesitation solved.

I pretty much replaced everything fuel, air, and spark related....but I noticed I did not check the injectors. After checking the injectors, several were spraying streams and non uniform patterns, I had some spare ones so I swapped them out as well as my cold start valve. While I had the fuel distributor off I also replaced the rubber boot at the bottom and also changed out the throttle position sensor. While I had everything off I removed the plugs and I used 2 cans of carb cleaner through the injector ports and cycled the engine after each series to clean everything. I noticed some residual oil washing out into the intake manifold so I continued until only clear carb cleaner came out. I buttoned everything back up and went on a test drive and no stumbling or hesitation. Idle was super smooth. I'm almost positive that the injectors were the problem, but since I replaced/changed so much it's hard to tell and I will not try to find out either
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  #3  
Old 03-26-2015, 02:02 PM
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It seems with the CIS cars that eventually pretty much all of it has to be replaced for them to run properly. Went through the same ordeal with my 300E when I had it...

The v8's seem less prone to the problems of the smaller engines it seems, at least in my experience.
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-diesel is not just a fuel, its a way of life-
'89 420SEL 168k - mine (OC-170,000)
'93 190D 2.2 - 223k - mine (OC-222,700)
'01 E320 Wagon - 149k - mine (OC-154,000)
'05 C240 4matic Wagon - 153k - wifes (OC-154,500)
'01 E320 - 162k - Dad's (OC-163,500)
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  #4  
Old 03-28-2015, 08:49 PM
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What's the compression on the cylinders? Is EHA original?
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  #5  
Old 03-29-2015, 05:23 AM
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Problem was solved.
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  #6  
Old 03-29-2015, 11:35 AM
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So what was the problem and how did you solve it?

Duke
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  #7  
Old 03-29-2015, 12:08 PM
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SOLVED

Quote:
Originally Posted by lsmalley View Post
I pretty much replaced everything fuel, air, and spark related....but I noticed I did not check the injectors. After checking the injectors, several were spraying streams and non uniform patterns, I had some spare ones so I swapped them out as well as my cold start valve. While I had the fuel distributor off I also replaced the rubber boot at the bottom and also changed out the throttle position sensor. While I had everything off I removed the plugs and I used 2 cans of carb cleaner through the injector ports and cycled the engine after each series to clean everything. I noticed some residual oil washing out into the intake manifold so I continued until only clear carb cleaner came out. I buttoned everything back up and went on a test drive and no stumbling or hesitation. Idle was super smooth. I'm almost positive that the injectors were the problem, but since I replaced/changed so much it's hard to tell and I will not try to find out either
Posted above.
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  #8  
Old 03-30-2015, 12:23 AM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 14,861
When I had my 300E I too replaced all the injectors and it improved engine operation significantly....for about 10k miles....then it was back to being troublesome...I think mine needed a new wiring harness but I opted to get rid of it as the rest of the car was not in very good shape anyways.
__________________
-diesel is not just a fuel, its a way of life-
'89 420SEL 168k - mine (OC-170,000)
'93 190D 2.2 - 223k - mine (OC-222,700)
'01 E320 Wagon - 149k - mine (OC-154,000)
'05 C240 4matic Wagon - 153k - wifes (OC-154,500)
'01 E320 - 162k - Dad's (OC-163,500)
'07 E350 Wagon - 116k - dad's (OC-121,500)
'02 E320 - 193k - Brother's (OC - 192,000)
'09 E350 4matic Sedan - 84k - Brothers (OC-85,500)
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