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Old 12-05-2008, 03:27 PM
David Z
Join Date: Mar 2006
Location: Denver, Colorado
Posts: 58
Low power up hills

I am having a problem with my 85 300sd. When I am going up hill or when I press the accelerator to go into passing gear, the rpms seem to go up but the car slows way down. It also feels like it is coughing and gasping for air or fuel.

Is this a turbo problem, an injector problem, a fuel filter problem or what. How do I test for the real problem and how do I fix it?


85 300SD with 150k
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Old 12-05-2008, 04:17 PM
rrgrassi's Avatar
mmmmmm Diesel...
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,868
Change the fuel filters first, then report back.

70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

82 300D 322K My Daily Driver-Warndreicke in the trunk. Trip ODO still working!

90 Dodge D250 5.9 Cummins/5 speed. 350K
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Old 12-05-2008, 04:19 PM
Registered User
Join Date: Sep 2001
Location: central Texas
Posts: 17,133
Does it GO into passing gear ?
Does it seem like the transmission could be slipping ?
Is everything just hunky dory the rest of your flatlanding time ?
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Old 12-05-2008, 09:25 PM
vwnate1's Avatar
Diesel Dandy
Join Date: Nov 2005
Location: Sunny So. Cal. !
Posts: 2,403
Post '85 Diesels

Let's not forget that's the _only_ year mercedes used the stupid particle trap , it plugs up and the faster you run the engine , the less power it makes...

I know of one '85 that was purchased for $200.00 from a used car lot
" engine's junk " , I told my buddy to have the dealer replace the particle trap for free , he did and now it like all '85's (different trannys & final drives) is a real stormer .

So , if after replacing the two fuel filters and checking the shiphon from the fuel tank (the intank intake screen plugs with fungus often) it's still slow , give that a look .
1982 240D creampuff 363,000 miles, just overhauled
1978 300CD back from the dead&1980 300CD 90K Miles ICE COLD AC ~ SOLD
1984 300CD KEEPER ! 423,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed stickshift SOLD & missed
Krazy Kommie Ural Motos (3)
BMW Motos /5's SOLD
1959 VW #113 Deuxe Beetle, 36hp engine, stock
Junk Rust
Arthritis Crushed Spine,Broken Neck&Back
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Old 12-05-2008, 09:28 PM
TylerH860's Avatar
Join Date: Aug 2007
Location: Wichita, Ks
Posts: 5,187
From JimmyL

Rule #1: Its always the fuel filters...
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!
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