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603 Shakes at HOT idle-Could it be out of balance injectors?
My 300d shakes a good bit at idle (only when HOT- it's smooth as a top when cold). Could this be that the injectors are out of balance? I installed Bosios myself and never had them pop tested. They're very quiet and smooth as can be. But when the engine is hot (especially so after a long drive), it'll shake my knee back and forth at idle.
I replaced the original (nailing) injectors right after buying the car. I never drove it far enough to know if it did this before. I asked the dealer where I had it timed a year ago what he thought and he said weak IP or injector problem. He said have them pop tested.
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
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Replace fuel filters and/or check tank strainer and vent.
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Gone to the dark side - Jeff |
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That's all new except the vent. I've run it with the fuel cap off which should allow it to breathe easy. Still pretty shakey.
When run on any kind of oil it's smooth as a top hot or cold. I'm pretty baffled on the shake. I almost want to mess with the IP timing a bit +- a degree or two each way but I'm not sure of a good method of making sure I can get back to the starting point if need be.
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
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check the fuel strainers and filters
they always say this. I think its your IP. Based on my experience, the pump seals differently as they warm up, and it takes a while for the heat to build up in the IP due to circulating engine oil. The 603 is normally a very smooth engine and it has much less tendency to lope like the 617's. So to shake that much hot is indicative of a serious imbalance in pressure. First thing to check however are the nozzles then let us know.
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
#5
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Quote:
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
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Mine will do that as well once in a while after a long highway run on a very hot day. I was told by the local Bosch diesel shop that its probably the IP. Its not the injectors.
You can feel it in the car, its a back and forth motion, the engine is rocking. Like a 617 with a bad rack bolt. It doesn't bother me enough to cough up $1k for an IP rebuild. Eventualy though, throw that in with the bottom seal leak, and a few other poor running symptoms of an old IP...
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#7
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Quote:
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
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Also did it start shaking after the Bosio Nozzles were installed or did it run OK for weeks or months before the shaking started? If burning thicker oil makes it run smoother it may well be the injectors or a IP timing issure (related to timing chain stretch ???). If the injector pop pressures are out of spec it could also effect the timing. Pop pressures lower than spec means early injection higher than spec means later injection.
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84 300D, 82 Volvo 244Gl Diesel |
#9
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Quote:
1. Transmission 2. Paint 3. Interior 4. IP So its on the list.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#10
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I've been looking for solutions to a hot idle shake and found more than one member solved the problem with new engine shocks.
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Charles 1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html |
#11
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Quote:
I'm not that bad but the more stuff that gives way and I'm having to fix, I'm getting close!
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
#12
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How are the motor mounts?
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91 350SD 14 F150 Eco 19 Fusion Hybrid 11 GT500 |
#13
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They are original as far as I know. Probably could use a change. They seem different than w123 rubber mounts. Do ours wear out regularly on the 603's hydraulic mounts?
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. |
#14
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Before you rebuild an IP or go replacing shocks and mounts and everything else my suggestion is to do a compression test when it is in the faulty state.
The test costs little ($30 for a tester at HF) and it will qualify the most basic requirement of the engine. What if you find that there is an interchange happening between two neighboring cylinders? All of the work and expense on the other items would have been a waste.
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Dionysius |
#15
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If you shake the engine you can judge whether the mounts are getting weak, on the 603 the fan can hit the shroud when the mouonts go out. Ask greasybenz. However, even a weak mount will not result in an engine loping side to side unless there is a basic underlying reason for it to run ragged at idle. The best plan would be to check the injectors first (thats easy), a compression test at the same time the injectors out, then take it from there. + replace the heat shileds under the injectors when you replace them. Like I said the 6 cyls just normally idle so smoothly they're amazing.
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
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