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  #1  
Old 08-20-2010, 05:37 PM
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Why is my brother's '83 300d so slow?

Hi everyone,

Been a long time since I've posted anything. I drive an '85 300D. My brother liked mine so much that he decided to get one for himself. He bought an '83 300D. I was just able to see it and drive it for the first time today. When I got in to drive it, the first thing I noticed was that it is soooooooo slooooooooooow in the pickup compared to mine. Like a pretty good bit. I also noticed that his speedometer only goes up to 85 or 90 mph where mine goes up to 120 I think. I was under the impression that our cars would have had the exact same engine in them.... Is this not the case? If they are indeed the exact same engines, why would his be so freaking slow on take-off? Thanks!

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  #2  
Old 08-20-2010, 06:05 PM
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Location: Albany, OR
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There are many things that could cause slow acceleration. Take the banjo bolts off the intake manifold and top of the injection pump and clean them. Then get full of carbon and it kills the turbo boost. There could also be a dragging caliper or two, or the parking brake isn't releasing like it's supposed to. Or the linkages could be stiff and need lube, or they might be loosing so of the throw due to worn or broken pivot points. Look at each linkage and pivot and make sure you're not loosing any motion anywhere.
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'82 300TD ~ Winnie ~ Sold
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  #3  
Old 08-20-2010, 06:43 PM
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Answers

Quote:
Originally Posted by mbinnashville View Post
Hi everyone,

Been a long time since I've posted anything. I drive an '85 300D. My brother liked mine so much that he decided to get one for himself. He bought an '83 300D. I was just able to see it and drive it for the first time today. When I got in to drive it, the first thing I noticed was that it is soooooooo slooooooooooow in the pickup compared to mine. Like a pretty good bit. I also noticed that his speedometer only goes up to 85 or 90 mph where mine goes up to 120 I think. I was under the impression that our cars would have had the exact same engine in them.... Is this not the case? If they are indeed the exact same engines, why would his be so freaking slow on take-off? Thanks!
Banjo Bolt
http://www.peachparts.com/shopforum/showthread.php?t=102259

ALDA issue threads
http://www.peachparts.com/shopforum/showthread.php?t=239597


Why do I have vacuum in my diesel tank.....................?
http://www.peachparts.com/shopforum/showthread.php?t=217628

MB diesel filtration, how it works.
http://www.peachparts.com/shopforum/showthread.php?p=1055075

fuel filter change
http://www.peachparts.com/shopforum/showthread.php?p=824006

Diesel filters, no tank strainers please.
http://www.peachparts.com/shopforum/showthread.php?p=1046422&posted=1

Primary filter melted by biodiesel?
http://www.peachparts.com/shopforum/showthread.php?t=213712

I'm baffled and at wit's end!?!?!?!?!
http://www.peachparts.com/shopforum/showthread.php?t=138961

Algae/Fungus fixation...
http://www.peachparts.com/shopforum/showthread.php?t=138733

Biobor, what is it, why do I need it???
http://www.peachparts.com/shopforum/showthread.php?p=723857

Filters, Fungus, Biocide, etc.
http://www.peachparts.com/shopforum/showthread.php?p=823378

Algae Clogged Filter Pic StarTron WORKS !
http://www.peachparts.com/shopforum/showthread.php?t=138728

Braided fuel lines weep. 1984 300TD turbo
http://www.peachparts.com/shopforum/showthread.php?t=158107

300SD Fuel Filter Replacement Instructions
http://www.peachparts.com/shopforum/showthread.php?t=105344

240D fuel tank removal and cleaning
Good for any W123 sedan.
http://www.peachparts.com/shopforum/showthread.php?p=813925

Check out this fuel pickup screen
http://www.peachparts.com/shopforum/showthread.php?t=140961

W123 Fuel Tank Screen Replacement
http://www.peachparts.com/shopforum/showthread.php?t=199206

Recommended diesel fuel additives?
http://www.peachparts.com/shopforum/showthread.php?p=1298228

fuel additives
http://www.peachparts.com/shopforum/showthread.php?p=179712

Additives
http://www.peachparts.com/shopforum/showthread.php?p=589420

Why Put Transmission Fluid In Diesel Tank?
http://www.peachparts.com/shopforum/showthread.php?p=304476


Beware diesel rodents!
http://www.peachparts.com/shopforum/showthread.php?t=142146

EGR blocking plate kit "Brian Carlton"
http://www.peachparts.com/shopforum/showthread.php?p=615823

physics of turbo question
http://www.peachparts.com/shopforum/showthread.php?p=792013

Exhaust leak between engine and Turbo
http://www.peachparts.com/shopforum/showthread.php?t=176625

Turbo Cartridge Replacement
http://www.peachparts.com/shopforum/showthread.php?t=135489

Turbo Rebuild
http://www.peachparts.com/shopforum/showthread.php?p=809807

Rebuilding Turbo
http://www.peachparts.com/shopforum/showthread.php?t=111519

Need help: Garrett turbo rebuild on OM617 1982 300SD
http://www.peachparts.com/shopforum/showthread.php?t=167490

Turbocharger Wastegate Valve Spring Tension Adjustment for 617 Engines
http://diymbrepair.com/easley/wgate.htm

Adjusting the Turbo Wastegate
http://www.serenitysys.com/MB/Service_Info/Turbo_Tweak/tweaking_the_mercedes_617_turbo_.htm

Turbocharger Wastegate Adjustment:
http://www.peachparts.com/shopforum/showthread.php?t=114337

Turbo boost guage advice needed
http://www.peachparts.com/shopforum/showthread.php?p=384697

Replacing Seals on Turbo Oil Drain Pipes
http://articles.mbz.org/engine/diesel/seals/

W126 OM617 1985 300SD turbo drain tube gasket & seals
http://www.peachparts.com/shopforum/showthread.php?p=799062


Valve adjustment OM615, 616, 617 FYI.
http://www.peachparts.com/shopforum/showthread.php?t=107729

Diesel Injection:
http://www.peachparts.com/shopforum/showthread.php?t=142405

Vacuum Pump Rebuild Thread
http://www.peachparts.com/shopforum/showthread.php?p=1927867

Diesel Injection Pump Timing Device threads
http://www.peachparts.com/shopforum/showthread.php?t=239595






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1985 300SD
1983 300D
1984 190D
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  #4  
Old 08-20-2010, 07:18 PM
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AND YOUR BOOK REPORT IS DUE ON MONDAY....
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  #5  
Old 08-21-2010, 01:28 AM
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Check out the rubber thingy on the firewall, never can remember it's name...

- Peter.
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  #6  
Old 08-21-2010, 05:31 AM
t walgamuth's Avatar
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Location: Lafayette Indiana
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First thing to check when a diesel is not performing is filters. If any question about fuel quality or bacterial action use a biocide to clean out the tank.

On an 83 it is possible it could be taking off in second gear. If they do this it is excruciating.
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #7  
Old 08-21-2010, 08:35 AM
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Holy Cow Roy, talk about inundation!!!! Great stuff there.
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  #8  
Old 08-21-2010, 09:28 AM
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I would start by checking the throttle linkage. Have someone sit in the car and push the accelerator pedal to the floor while you watch the linkage under the hood. Look at the linkage at the back of the injection pump and be sure the little arm on the back of the pump is hitting the stop bolt. If it is not hitting the bolt at WOT, you need to figure out why. It could be that the linkage is just worn an has never been adjusted or the throttle bushing/bellcrank on the firewall could be worn. The linkage could also be hooked up wrong if some shade tree mechanic has worked on the car recently.

After you have done this.... Then go on to inspecting the boost lines, cleaning banjo bolts, replacing filters, etc....
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  #9  
Old 08-21-2010, 12:15 PM
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Quote:
Originally Posted by pj67coll View Post
Check out the rubber thingy on the firewall, never can remember it's name...

- Peter.
It's called the throttle bushing. And it looks like this. Lots of time the rubber breaks and you loose most or all of the motion of the go pedal.
Attached Thumbnails
Why is my brother's '83 300d so slow?-throttle_bushing.jpg  
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'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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  #10  
Old 08-21-2010, 04:48 PM
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and even in perfect tune, your 85 is not the same as the 83. the 85 has more HP and a newer a/c system. also it has a taller gear ratio, so, you will be turning lower RPM's as he will at the same speed.

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My drivers:
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