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#1
07-03-2006, 03:48 AM
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power loss in 77' 300d, need advice
alright, I have a 1977 mercedes 300d, bought it about 3 years ago, and as anyone who's every driven one of these, it's speed is about as leisurely as a man with an appointment for colonic irrigation. But recently it has been accelerating up to freeway speeds with more difficulty than normal accelerating up to a reasonable speed. Have had one filter replaced recently. It runs off of dino-diesel, but I am thinking that it may be a clogged fuel line or the filter which wasn't replaced recently. I was thinking it could also be a fungus problem. I need to figure out what the problem is without completely dismantling the car as I can't afford to have it not running. I would appreciate anyone able to shed a little light on the situation. Additionally I was thinking of trying out a load of fuel with a cetane boost as it is probably designed to run on European diesel which has a higher cetane content, bad idea?
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#2
07-03-2006, 03:52 AM
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When were the fuel filters last changed? What about the air filter? How about the last valve adjustment? Air pressure in the tires? All of these can make a difference in the "power" your car has.
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123.
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#3
07-03-2006, 04:07 AM
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the tire pressure is fine, I believe the air filter was changed a few weeks ago as was the primary fuel filter, I wouldn't think it would be a valve problem as the problems started only after my last fill-up and the power loss has been off and on (I've only had a reasonably noticable power loss about three times, after which power output gradually came back up to near-normal).
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#4
07-03-2006, 01:59 PM
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Any chance you got some bad fuel? Why not dilute it with some fresh just in case. You have to fuel anyways just do it earlier. Probably not the problem but I would eliminate it anyways as really costs you nothing in the long haul. Now if you got a lot of dirt with your fuel your new filter may be comprimised. The other filter is cheap so change it as well. In otherwords get the small cheap stuff eliminated as the source of your problem first.
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#5
07-03-2006, 02:19 PM
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Have noticed changes in fuel grades at the pump myself, primary filters having shorter lifespan. Fuel these days seems thicker and less "diesel stinky" then what we got a few months ago. Can recommend using a little Diesel Kleen additive in every tank. For me the larger secondary filter lasts about 1 year. Primaries about 3 months now, used to be 4-6 months. Otherwise yeah, check the valves.
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#6
07-03-2006, 04:44 PM
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thank you, I had thought is was dirty fuel gunking up my works, so I was thinking of using a fuel cleaner, it's cheap enough that it'd be worth a try
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#7
07-03-2006, 05:33 PM
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New ultra low sulfer diesel at your pumps already?
It's coming in here. Change your inline fuel filter also.
__________________
77 300D- new to me, lots of "issues" to deal with. But a nice unit. Diesel man- 84 Toyota Diesel cruiser
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#8
07-04-2006, 12:38 AM
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Quote:
Quote:
You also have Mr. Tank Strainer to think about.....
__________________
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
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