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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: 4,872
Change the fuel filters first, then report back.

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

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

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: 17,277
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: 5,039
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 380,000 miles
1984 300CD KEEPER ! 481,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed SOLD & missed
Kooky Kommie Ural Motocycles (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 DeLuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck, Back & arm, lots of screws, pins & plates .
Memories, Peace Of Mind
facts & reality don't change because you can't handle them
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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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