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#16
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I called another mechanic I trust and he said he thinks the injectors are "dumping" to much fuel. He wants me to bring it in. Is that something that can be adjusted?
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#17
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I think as the injector techs like to call it, "hosing" where the nozzle doesn't properly atomize the fuel, cold, it's a huge problem, warm, it leads to detonation. Yes, diesel detonate just like their petrol cousins.
Also, dumping per say comes from low pop off pressures and it is adjustable by changing shims against the spring inside the nozzle Update: Injectors are out, MADE IN INDIA! I think that code for junk. One heat shield totally crusty with carbon, all others fairly clean. Stay tuned. Photos coming.
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Mark ======== THE WHITE FLEET 2016 GLE300d 4-MATIC 38K BROWN! 2012 S350 Bluetec==94k WHITE 2007 ML320 CDI==166K WHITE (FOR SALE) Under new management: 2005 E320 CDI--140K--WHITE 1995 E300-Diesel-133.5K--THE CAR IS BLUE 1986 300SL--97.5K (European) AND WHITE. Back in Europe! 1991 190E 2.3-73K California Perfect.--WHITE 1995 E320-Wagon-159K--WHITE (recently scrapped) 1987 300D Turbo-213K--WHITE 1987 190D 2.5 Turbo-288K--WHITE Last edited by markg612; 01-18-2010 at 04:07 PM. |
#18
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Diesel Purge
Another Poster above has already stated "In Town" Diesel is "C**P.
I'd try some Straight LM Diesel Purge from a Small self made "Bottle" to see if that clears them up. Also pick up some RedLine 85 Plus Diesel additive. (It'll raise the Cetane and clean the Injectors from the Tank end of things.) A "Mechanic" who wants you to "Bring It In" for "Perceived" bad Injectors will only R+R yours (AND/OR R+R the Nozzles) without cleaning first. [No money in cleaning ,AND he'll not have the Very Expensive Equipment to clean them properly] http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1284940-liqui-moly-diesel-purge-done.html http://forums.tdiclub.com/showthread.php?t=87948 http://www.carpartsdiscount.com/auto/parts/miscellaneous/lubro_moly_diesel_additive.html?3593=70155&utm_source=froogle&utm_medium=cpc&utm_campaign=adv&3593=70155&3671=1002
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'84 300SD sold 124.128 |
#19
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Check the compressions.
These engines can suffer inlet valve recession, particularly on the rearmost cylinders. The engine fires on the good compressions of the forward cylinders, and is OK during afterglow, but, once the current to the glow plugs stops, the cool rearmost cylinders are no longer compressing enough to get hot enough to burn the fuel well - resulting in rough running and smoking. As a quick check, take the inlet manifold off, plug any vac pipes, secure anything that's loose, and start the engine up - if the valves have sunk into the head far enough to lose compression, you'll see exhaust smoke chuffing back out of the inlet ports. |
#20
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The soot layer in the #6 intake ports in the head (I have the intake off because the resonance valve has half of the vain broken off for the second time) is substantially heavier than the the other cylinders.
Ugh, I haven't thought about valve recession since powerplant theory 30 years ago in A & P school. That would completely explain the lack of oil consumption and low compression cold. Good call, injectors are back Thursday, test run results to follow. . . . #1 cylinder heat shield had a huge amount of carbon on the prechamber side compared to the all the others, also, the burn pattern on the injector face was irregular compared to the other 5. Cross fingers, I don't have my head wrapped around a valve job yet, but my fear is it's time. |
#21
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Could another culprit possibly be my injection pump needs timing? Just throwing stuff at the wall. Poured a bottle of Redline 85 plus in the tank tonight (1/2 tank left) and took the car for a 60 mile high speed trip to maybe blow out some bad stuff . Probably didn't do ****, but I enjoyed a quiet evening on I-57 south of Chicago. I'll see if anything is different tomorrow morning.
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#22
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I'm thinking pump timing would be effecting all modes of operation, which once it's warm are perfect. . .
Injectors are in Crown Point this AM, should know something this afternoon regarding condition. |
#23
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I am having the same problem, intermittantly, with my '95 E300D.. new to me.
3 times so far, all at or below freezing. Clears up at normal operating temperature. Some bubbles in lines. Will have to recheck lines when warmed up. Starts instantly, any temperature, and doesn't start the stumbling for a good 3-4 minutes, then clears up in another 2-3. I'll be watching this thread.. |
#24
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Good news. Red Line 85 plus (same as Red Line Diesel Catalyst per Redline Co. rep) and a good hour of steady speeds in the 75-85 range seemed to have cleaned out my injectors. I had no missing or heavy smoke of any kind upon cold start up this morning. I hope I have found my solution. Based on all I have read, I think I will continue to use smaller doses of Red Line upon fill ups. It seems to have a great reputation on the internet.
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#25
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Nobody has explicitly said this but the afterglow feature is why the cars having these problems run well for the first few minutes. The GPs help when combustion is marginal for whatever reason. Depending on conditions, afterglow can stay on for around 2-5 minutes.
If it were my car I would pull the injectors and have them pop tested, and while out perform a cold compression test on the car. It is either poor fuel injection quality or low compression that causes this is my guess and doing both will tell you which it is.
__________________
Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz |
#26
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>>The soot layer in the #6 intake ports in the head (I have the intake off because the resonance valve has half of the vain broken off for the second time) is substantially heavier than the the other cylinders.
I'm sorry, but, this tallys exactly with what I found on my OM606 when the inlet valve seats had sunk into the head. If you do run the engine with the manifold off, you'll probably see the exhaust smoke chuffing back out of these ports, and the other cylinders will be OK. In my case, I took the head off, and had new seats pressed in to cylinders number 5 and 6 - if there are dark sopts on the grey surface of the seats, it's a sign of a metallurgical change which means they will soon fail. In my case, the seats on No 6 had sunk badly, and the seats on No 5 were badly spotted. The seats on the other cylinders were fine. I fitted 12 new inlet valves, had new nozzles fitted to the injectos while they were out, and completed the job with a spend of £800 on parts and machining. £200 of this cost was for the new nozzles. It's worth checking the crankcase breather system out carefully, because this oil mist is virtually the only lubrication these inlet valves get, and the routing for the rear most cylinders is a little convoluted. The rubber elbows which push into the manifold are prone to blocking up. |
#27
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Bad news, all the injectors past muster perfect, "They were near perfect, less than 50PSI between all with perfect spray pattern," Matt from MDI was happy to say. Ugh--The shop's suggesting air in the delivery stream up stream of the pump, hence the initial first run smoothness followed by the ruff run. I'm think number_cruncher is spot on, but I'm going to chase the air issue first and then face reality!
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#28
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Chasing air issues now in low pressure side of fuel delivery system. There is a check valve of sorts in the return line just below the filter housing that was added by MB due to "starting issues"--This $70 gem that might be the culprit here. It holds fuel in the return line and keeps it fuel from falling back to the tank when the vehicle is off. If it has failed, any air leak up top would allow the a huge bubble to form in the filter and would cause massive smoking and missing until it cleared. . . More later.
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#29
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Why only when cold weather?
__________________
Jimmy L. '05 Acura TL 6MT 2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China" Scar engine installed '81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John |
#30
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The cold weather exacerbates the issue. A cold start on an 80° day, it does the same thing, but not near the smoke and it clears much quicker.
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