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#31
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He has an '88, no EGR valve.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#32
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M103 engine ignition timing is all CPU and sensor controlled. MB sets up the timing for the US based on the fuel octane, quality and emission controls.
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#33
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Quote:
I have low power at the bottom end, I didn't mean idle, sorry. Along with very poor MPG. My last fillup was 12.1mpg. To this post and others, the 1988 model does not have an EGR valve. Compression is 190psi all cylinders. I had the entire head rebuilt including new valve guides + seals. Head pressure tested and skimmed. I had the head off because I was losing a lot of oil and coolant and was told by a local indy that the head gasket was leaking. It was a great opportunity to really get to know the engine (my first rebuild) and it didn't cost me a whole lot. Experience was well worth it. Had some help from my dad of course...but he is stumped on the rough idle too. He goes by "Merky" on this forum, but rarely posts. There were a few other items such as the water pump that needed replacing. The valves looked great. I have a large thread with tons of pictures that I took throughout the whole thing here: My 300TE Head Gasket Thread (yes pics!) When I rebuilt the top end, I set the cam timing as it shows in the MB manual to perfection. Should I need to get a light to still check it? EDIT: Here is a video on youtube http://www.youtube.com/watch?v=kMAVAjyVSTE You can see the idle economy gauge and rpm fluctuations. Maybe this will give you some ideas. I would love to take it to the dealer and have it fixed....but I A) expect a huge bill B) Expect several expensive items to be fixed before the real solution is found
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k Last edited by ps2cho; 04-08-2009 at 08:50 PM. |
#34
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Interesting in the video. It really does look like either the idle control valve is fluctuating/hunting........possibly due to the Air Flow Potentiometer not being in spec......or there's a bad vacuum leak somewhere.
12.1 Mpg would point to massive overfueling.....does the exhaust smell like it? Is it clean? I wonder if the timing might be slightly off somehow?
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#35
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Quote:
When I need advice from them (extremely rarely) they need to call their "old guy" or do a search from their on line manuals. Sometimes they even point me in the direction of an indie specialist - often an old dealership mechanic out on his own. You would need to find an Indie specialist. For injection problems I take my cars to a franchise Bosch injection specialist. Even the dealerships send their cars to these guys. |
#36
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I see that Wagon has Euro headlights. Are these not converted to level control?
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#37
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I take it back, he does not have them "without" level control, the level control hookups are present, but it is not used. Someone just put little stubs of plugged vacuum line on them to keep dirt out. They are true Bosch Euros...
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) Last edited by pawoSD; 04-08-2009 at 09:50 PM. |
#38
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I checked the AFP with a DMM and it showed .7v which is on spec. I have replaced every idle air hose in the engine...I just don't get it I have sprayed carb cleaner all over the engine at every hose and it makes no change. Is there a way to check for crankcase pressure? Is there a spec for it or something? Quote:
I took the car to a specialist in Tarzana "Enrique"...and he replaced a hose that he said was leaking and said the car was perfect. It was far from it when I got it back...It was horribly slow and still had a rough idle. He must have adjusted the EHA because I had to turn it richer to get the lost power back. It was horrendously slow. I won't take it back to him again that's for sure. They are just DEPO Euros. I have not done any conversions. The stock lights didn't have it either.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#39
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Quote:
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#40
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...but I'd really like to figure out WHY there is an uneven flow of air in the intake manifold. It shouldn't be fluctuating like that...it should be rock steady, right? But for reference, I have swapped the EHA, fuel pressure regulator, and fuel distributor before....
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#41
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The light is to check ignition timing, and yes you should do it. I realize that it is all set by computer, but there may be a problem in the ignition timing nonetheless. If you find that the timing is off, then you know what systems to start chasing. Things like crank position sensor, cam position sensor (if present), knock sensor, temp sensors, etc.
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1987 W201 190D |
#42
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Does the air meter move smoothly? On my 300E it was crooked and got stuck in the opening when coming back to the rest position.
I think that the Potentiometer is more likely to cause a hunting idle syndrome than the EHA.....
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#43
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Yes. The picture in the first post shows the whole mixture unit removed. I adjusted the sensor plate so its perfect.
Even if the potentiometer checks out voltage-wise...could it still be bad? Quote:
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k Last edited by ps2cho; 04-09-2009 at 12:40 AM. |
#44
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Quote:
If the computer is trying to adjust the idle with the idle control valve but the Potentiometer has a bad spot on it around idle, it will confuse the computer and cause it to keep adjusting the valve back and forth trying to find a good idle.
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#45
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Yes, you would need to check that with an analog meter for best results. Digital meters won't show dead spots, dips, or other non-linearities nearly as well as a needle meter.
Forgive me if you've already answered this question but, have you checked to make sure it's running in closed-loop? Also - Somebody posted a link to a PDF file with a complete theoretical description and diagrams of the Bosch CIS system. It's well worth the read. I think the post is maybe a month old? I highly recommend checking it out.
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition |
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