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  #1  
Old 10-23-2013, 06:50 PM
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Odd acceleration issue

'83 300D Turbo

So the gf said that her car will start to slow down from 55 and get slower and slower while driving sometimes and I actually experienced the issue just now. The car would not accelerate at all. I pressed the accelerator and it kicked down but it felt like the car was pushing a brick wall.

At the gas station I checked the brakes for excessive heat and the fronts were normal and the rears were cool.

The clear inline filter showed a little bit of gunk so I'm going to swap that out and hopefully I have a spin on filter and can see what happens. She just filled the tank so I really can't remove the tank strainer.

Any ideas or am I on the right track?

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  #2  
Old 10-23-2013, 07:08 PM
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Sounds like fuel starvation. You're on the right track. Did you see if the fuel tank vent is clogged?
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  #3  
Old 10-23-2013, 07:13 PM
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remove the fuel tank cap and see if you get a swoosw sound if you do it is the bell shape tank vent under the car near the drives seat take off and clean. In the past with me it has been the prefilter.
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  #4  
Old 10-23-2013, 07:18 PM
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I'll try that when. I get home. Totally forgot about that bugger
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  #5  
Old 10-23-2013, 08:19 PM
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Clean the banjo bolt and line from the intake manifold to the ALDA on the IP.
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  #6  
Old 10-23-2013, 08:28 PM
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I just went through a year long experience with a backed out IP timing shaft bolt. -yes it was torqued.

No indication of unburnt fuel or issues starting. Low power (timing off) most noticeable after initial take off.

The car I pulled parts from (someone's project car) also had a backed out bolt but the shaft was still keyed to the timer and the shaft was fractured!
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  #7  
Old 10-23-2013, 09:07 PM
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Quote:
Originally Posted by GregMN View Post
Clean the banjo bolt and line from the intake manifold to the ALDA on the IP.
This is definitely a fuel issue, not boost.Acceleration is fine off the line.
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  #8  
Old 10-23-2013, 09:37 PM
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I was thinking maybe some bad fuel. Still acceleration off the line should have been impacted. Take a smell of the tank to see if gas was accidentally loaded.
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  #9  
Old 10-23-2013, 10:16 PM
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What you are describing is very similar to what happened to me recently. Inline prefilter clogged with small blank chunks. Fuel starvation only occurred a couple of times before I figured it out and replaced the filter. Just cruising along at 73 and want to pass someone, step on the skinny pedal and voila...brick wall and then even some loss of power. Most unnerving. But easy to remedy.
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  #10  
Old 10-23-2013, 10:52 PM
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Definitely tank vent. Norm does the same thing.
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  #11  
Old 10-23-2013, 11:06 PM
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Seems like the right track. I had an issue with a leaky shutoff valve on the key switch
that led to vacuum leaking into the shutdown circut causing the slows so check that possibility.
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  #12  
Old 10-23-2013, 11:22 PM
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Did she put gas in the tank?

Could be a linkage issue, how is the throttle pivot pushing on the firewall?
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  #13  
Old 10-23-2013, 11:33 PM
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Hmm

I agree with all of the possible answers offered thus far.

However: Foul or incredibly low cetane fuel will cause the exact same issue...

Warning ALL Diesel Owners
http://www.peachparts.com/shopforum/diesel-discussion/309367-warning-all-diesel-owners.html#post2841158

bad smelling fuel, Gag, gasp, choke

Diesel owners need to know fuel data
Diesel owners need to know fuel data - PeachParts Mercedes ShopForum

######################################

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Fuel tank vent pictures + location
93 300D 2.5L Turbodiesel Power Loss

What happens when a tank vent gets clogged.
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Imploded fuel tank - so sad!

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MB diesel filtration, how it works.
MB diesel filtration, how it works. - PeachParts Mercedes ShopForum

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Algae/Fungus fixation...
Algae/Fungus fixation... - PeachParts Mercedes ShopForum

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Algae Clogged Filter Pic StarTron WORKS !
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240D fuel tank removal and cleaning
Good for any W123 sedan.
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Changing the Fuel Tank Strainer on a Mercedes Diesel
Episode 1: Changing the Fuel Tank Strainer on a Mercedes Diesel - YouTube

Check out this fuel pickup screen
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W123 Fuel Tank Screen Replacement
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Lift Pump taken apart
fuel pressure - PeachParts Mercedes ShopForum

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  #14  
Old 10-24-2013, 09:43 AM
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Quote:
Originally Posted by colincoon View Post
Definitely tank vent. Norm does the same thing.
After driving 15 minutes I removed the filler cap and I did my get a "whoosh" but as soon as I can I'll clean the vent valve as a precaution. Time to schedule a tank cleaning too
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  #15  
Old 10-24-2013, 09:46 AM
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Quote:
Originally Posted by barry12345 View Post
I was thinking maybe some bad fuel. Still acceleration off the line should have been impacted. Take a smell of the tank to see if gas was accidentally loaded.
No gas smell, I was with her when we filled up and we used the dedicated diesel pump. I also have her educated on diesel dueling procedures.

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