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  #1  
Old 12-10-2010, 10:35 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
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87TD rough acceleration

this morning driving to work, from 40 or so, acceleration rough if pressed. light acceleration is ok.
I've not popped the hood yet, don't yet have time.
where would you guys start?
fuel tank is 1/2 or better, the coolant and oil pressure levels are fine.
just no acceleration...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #2  
Old 12-10-2010, 10:43 AM
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Join Date: May 2010
Location: ct
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by rough do you mean skipping or nailling as in not running smooth or that you just have no power. I have noticed lately in the cold weather that my boost will stick at say 6psi and the pedal will get mushy and the car feels like it has no power, but with a quick flick of the throttle it snaps the boost up to 10-12Psi and I'm off like a rocket. Much like you I havent had the time to check thing out under the hood. Basically I would start with making sure your wastegate is closing all the way.
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  #3  
Old 12-10-2010, 10:46 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
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Location: Mount Holly, NC
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rough.
not "a lack of power" it has no power and stumbles when floored as usual... if feels like air in the lines, or an injector issue... possibly the IP DV seals are failing... arrrgh. going to have to pressurize the fuel and look for leaks, then see what's up I guess...
this is going to be hard to explain to SO... it's her car.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #4  
Old 12-10-2010, 02:41 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,346
Air in lines. Pretty sure this is why I get power loss at WOT and speed.
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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
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#1995 E320 Touring
#1985 300D Sedan
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  #5  
Old 12-10-2010, 03:19 PM
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Join Date: Nov 2005
Location: Iowa City, IA
Posts: 1,647
Wonder if tank screen could be clogged. Where do these leak air mainly? Fuel filter o rings? The 87 300DT (not TD or TDT) i got for 500.00 a while back that i'm straightening out and giving to my sister ( I never told you guys about this one ) has an air leak i think.
Or a clogged screen. I was getting on insterstate and floored it and then it acted like it ran out of gas. I fumbled my way to a gas station and put in some fuel. Then made it a little down the road and it quit. Couldn't get it back started. 4 days later came back and changed fuel filter and orings and got it going after a ton of cranking. I mean these things are really a pita to get going if you run out of gas or get air in the lines. Whats up with that , Mercedes?

I was going to check tank screen but the fuel in the site filter is clean and green (shell). I still might. Good luck with it.
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  #6  
Old 12-10-2010, 04:45 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,346
Oh btw where is the fuel tank vent? I get the dreaded suck.
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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42
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  #7  
Old 12-10-2010, 05:22 PM
Aquaticedge's Avatar
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IIRC its on the left side near the passenger door area, Also check your Fuel Preheater. Mine leaked air and Caused some simular situations.

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed
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