Very very slow until 60mph, then zoom

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Very very slow until 60mph, then zoom

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Mercedes >> Mercedes Benz Models >> Diesel Discussions >> Very very slow until 60mph, then zoom

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Very very slow until 60mph, then zoom - 12/28/2004 10:07:10 PM

unclegreaser

Posts: 2
Joined: 12/28/2004
Status: offline

i have a 1985 300d turbo, automatic, 220,00 miles. from 0 to 60 it takes about fourty seconds, then it takes off. if i leave it in first then second and then drive, holding the rpm's higher it is slightly faster but still very very slow.

i have changed all the fluids and filters. turbo spins with acceleration

thanks for your thoughts

Post #: 1

RE: Very very slow until 60mph, then zoom - 12/28/2004 11:21:33 PM

sleepwalker

Posts: 7062
Joined: 4/12/2004
From: Philippine Islands
Status: offline

have you done good maintenance lately?

air filter?
fuel filter and pre-filter?

(in reply to unclegreaser)

Post #: 2

RE: Very very slow until 60mph, then zoom - 12/29/2004 12:32:05 AM

pberku

Posts: 77
Joined: 10/17/2004
From: Canada
Status: offline

Check your accelerator linkages, and cables for too much slack. Make sure that when you press the accelerator pedal, it activates the fuel pump correctly.

Phil

_____________________________

'95 E300D
180,000 Miles

(in reply to sleepwalker)

Post #: 3

RE: Very very slow until 60mph, then zoom - 12/29/2004 10:31:43 PM

unclegreaser

Posts: 2
Joined: 12/28/2004
Status: offline

this is a new to me car handed down thru a relative

sleepwalker: i replaced and changed every and all fluids and filters in the motor, tranny.

pberku: yes i checked the cable and it does the same if i control the unit by hand. fuel pressure is good and injectors, banjo bolt and so on have no clogs.

i feel like i'm missing something. if this was a carbureted motor it feels like it was running way to rich. i am not familiar with diesel much

thanks if you have further clues or ideas

(in reply to pberku)

Post #: 4

RE: Very very slow until 60mph, then zoom - 12/29/2004 11:56:45 PM

pberku

Posts: 77
Joined: 10/17/2004
From: Canada
Status: offline

A few questions and three suggestions.

a) What do you mean when you say "... than it takes off"

b) What do you mean when you say "pberku: yes i checked the cable and it does the same if i control the unit by hand"? What unit did you control by hand?

c) Apart from the loss of power issue, are there any other symptoms, ie: hard start, rough idle, exhaust smoke, (If yes, what color), etc., etc..

Suggestions:

1) Do you know how far back in time/milage the valve where adjusted on this car? If the valves are out of adjustment they can create (amongst many other symptoms) a low compression condition, causing considerable loss of power, and resulting in the symptoms that you describe. If you don't know when they were last adjusted, have them adjusted properly.

2) At that milage your timing chain should have either been checked and adjusted, and/or replaced. Do you know if this was done? If not, have the chain strech checked, and if necessary the timing chain replaced. The timing may be way off,

3) Look closely again at your fuel injector pump, and make sure that when the accelerator pedal is fully depressed, that it does actually activate the injector pump to maximum. [DO THIS WITH THE ENGINE OFF

Let us know what you find

Phil

< Message edited by pberku -- 12/29/2004 11:59:26 PM >

_____________________________

'95 E300D
180,000 Miles

(in reply to unclegreaser)

Post #: 5

RE: Very very slow until 60mph, then zoom - 12/30/2004 8:54:51 PM

mespe

Posts: 30
Joined: 5/20/2004
Status: offline

Could be several things,,,

1) Change your fuel filters lately? Both of them
2) Check your linkage Any slop???
3) Check the boost lines? (from the turbo is a boost line sorta like a vacuum line) if it's clogged, the IP will never inject enough fuel.
4) If boost lines clean, maybe an ALDA adjustment is in order.

Good luck

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(in reply to pberku)

Post #: 6