is it normal for a 300d not over 65 on the highway.
have her floored and she seems to struggle to get to 65


82 300d

thoughts?

new filters. new injectors. new bowden cable .
shifting seems normal

Clogged tank strainer?

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).

Have someone sit in the car, motor off, and press on the throttle pedal slowly all the way to the floor as you watch the movement of the linkages under the hood.

You want to check if the linkage going to the injection pump is actually moving all the way to the full throttle position.

Linkages could be be misadjusted, binding on something, or assembled incorrectly (I have had to fix this twice on cars I purchased).

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

If you have at least one half of Fuel and swap the positions of the Fuel Inlet Hoses and the Fuel Return Hose where they come off of the Fender Well. that bypasses the Fuel Tank Screen and draws Fuel from higher position in the Fuel Tank.

Note that because it is drawing Fuel from a Higher Position in the Fuel Tank it also means you would run out of Fuel earlier than is on the Gauge.

Clean the Turbo Boost Line where it comes off the back of the Intake Manifold. You could also T into the ADLA Line and see if it is getting Boost Pressure.

Check the Hose going to the Waste Gate. If it has a big crack or is disconnected the possible Boost Pressure is going to leak out of it.

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84 300D, 82 Volvo 244Gl Diesel

Dose the tank with biocide.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

What are the revs at 65?

{Are you stuck in 3rd gear?}

Does everyone else on the road seem to be going really slowly?

{Do you know you are really doing 65? Have you confirmed this by another method such as GPS?}

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Most likely a fuel issue, either your injection pump is not getting full stroke (linkage issue) or you've got a semi-plugged fuel filter. Could also be plugged air filter, or plugged exhaust.

If your engine also produces too much smoke, and the exhaust smells of raw diesel, you may have an EGR failed in the open position. Those were the symptoms on my 123.190 (300TD) which was a non-turbo car. Perhaps the turbo charger would mask some of those symptoms?

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

all new fuel filter.
new injectors
cleaned booster...actually changed the hose going to it.
ALDA has been turned 1.5...
i have not done the the gas tank strainer.
i think adjusted the linkage correctly.
linkage is hitting at the stop on IP
i did do gps and sez the same poop.
never a hint of smoke
150k on motor

hmm 4th gear



thanks for all the replies

Air filter or exhaust plugged?

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

A few things to try before removing the strainer to see if it is the problem. Strainer removal can be a dirty and unpleasant job if you are not prepared.

1. Swap the IP return and supply hose in the engine bay. The idea is to bypass the strainer and draw fuel from the return line in the tank. The return in the tank in a W123 sedan is about an inch above the tank bottom so make sure you have at least 1/4 tank of fuel.

or
2. run it from a gallon jug of fuel in the engine compartment

or
3. Tee in a vacuum gauge before the primary fuel filter/lift pump. There should be no restriction, i.e. very low vacuum reading if the strainer is not clogged.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

What are your temperatures like?

I bought an '84 300D recently and it too wouldn't get past 65mph. I did the fuel filters and linkages which made no difference.

The temperature was running low (under 80 deg C even at freeway speeds for 30+ miles). I replaced the thermostat which was a rusted mess and the temperature went back to normal and I was able to get it to 75-80 mph. After re-connecting and adjusting the ALDA, I can now easily get it up to 90mph and have had it just shy of 100 on a few occasions.

Can you feel the turbo kicking in at lower speeds WOT? Is the acceleration normal for city driving? Before I re-did my ALDA, I couldn't even tell that I had a turbo diesel. If your boost pressure is way down, you may have trouble with higher speeds.

Another thing you might want to check is your accelerator pivot mount. The rubber gets bad over time and when it starts to split, it still works for a period of time until it leaves you stranded somewhere. Before it fails, you will have some strange acceleration-related issues.

Dkr.

Do you the Original Poster is smoking Weed while driving it only appears that his Car is slow?

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84 300D, 82 Volvo 244Gl Diesel

Have you never had the feeling you're the only person who's awake - that "they" are all dawdling along - until you look down at your speedo and think "oh fu...

...that's why they're all so slow"!

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

I have had similar problem several times over the years. Following are recollections from not so good memory banks:

- my daughter was using car and she took it into Toronto shop (Eurocars). $50 later car was running perfectly. Bill only said "adjusted linkages"!

- I fixed another linkage problem. I think it was in mechanical linkage between pedal and engine linkages.

- Another time, it was something to do with the connection to the Bendix cable that goes to transmission.

- Boost line where it goes to the overpressure switch on the firewall. I had low power symptoms and it turned out to be a split in the rubber connectors at the valve. Teeing a pressure gauge into boost line close to ALDA should show if you have full boost or not.

This thread covers most other possibilities. Lots of good advice from the diesel experts.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

OMG

So that is my problem

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