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#1
12-20-2010, 12:50 PM
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Excessive knocking when cold
It just started this morning, it sounds like there was a metallic piece rattling in the engine, a bit of excessive pinging and knocking there... but it was gone when I got to work and the engine was warm. What could cause this?
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[/SIGPIC]~cirrusman 1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang" [SIGPIC] 1983 Toyota Tercel (Tommy, The little Toyota that could) 1965 Ford F100 (Grandma Ford) 2005 Toyota Sienna (Elsa, Wife's ride) Gone: 1988 Toyota Pickup 2004 Subaru Outback 1987 Cadillac Fleetwood Brougham 1986 Volvo 740 GL Station Wagon - Piece of junk. 1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.  1987 Pontiac Fiero GT 
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#2
12-20-2010, 01:27 PM
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You have just experienced injector nailing. It's caused by worn or gummed injectors injecting fuel to soon. It can sometimes be solved with a can or two of diesel purge. But often the injectors need to be removed and atleast reshimed to bring the pop pressure back up, or the nozzles need to be replaced.
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#3
12-20-2010, 05:08 PM
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Quote:
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[/SIGPIC]~cirrusman 1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang" [SIGPIC] 1983 Toyota Tercel (Tommy, The little Toyota that could) 1965 Ford F100 (Grandma Ford) 2005 Toyota Sienna (Elsa, Wife's ride) Gone: 1988 Toyota Pickup 2004 Subaru Outback 1987 Cadillac Fleetwood Brougham 1986 Volvo 740 GL Station Wagon - Piece of junk. 1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P. 1987 Pontiac Fiero GT
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#4
12-21-2010, 08:26 AM
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Quote:
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine) Raleigh NC - Home of deep fried sushi!
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#5
12-21-2010, 12:29 PM
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Speaking of which, it's time to change my injector braided hoses... 2 of them are leaking and I don't think the solvents are going to do them any good.
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[/SIGPIC]~cirrusman 1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang" [SIGPIC] 1983 Toyota Tercel (Tommy, The little Toyota that could) 1965 Ford F100 (Grandma Ford) 2005 Toyota Sienna (Elsa, Wife's ride) Gone: 1988 Toyota Pickup 2004 Subaru Outback 1987 Cadillac Fleetwood Brougham 1986 Volvo 740 GL Station Wagon - Piece of junk. 1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P. 1987 Pontiac Fiero GT
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#6
12-21-2010, 01:37 PM
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I'd run the diesel purge. Then change your filters and hoses. That way and deleterious effects of the diesel purge on hoses will not affect the new hoses.
DP can work to revive injectors in the case of an engine that has sat for a good while and injectors have gotten gummed up, or with an build-up in the injectors. But if the injectors are indeed tired then no amount of DP will help them.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#7
12-21-2010, 01:49 PM
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Similar experience with my other 300SDL
The knocking sound was loud and I thought something was loose inside the cylinder. I did not do a diesel purge. I soaked all the injectors in Marvel Mystery Oil for 2+ weeks and the problem went away. That was all I did and now the engine runs well. I did about 400 miles so far with no noise at startup.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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