84 300D Off the Line No Power - PeachParts Mercedes-Benz Forum

dejan007 · #1 10-26-2005, 03:22 PM

I am new to the Forum, my very first post. Hope that you folks can shed some wisdom and knowledge my way. Bought my first Mercedez ever, very excited about that, car runs great, diesel starts right up, but you could floor the gas pedal and the car goes nowhere. Very slow pickup couple of miles per hour until it hit 20mph, and then the darn thing kicks in and drives fine?? I would really, really appreciate some wisdom from you folks on where to begin to repair this problem. Thanks, Love this site!!!!!

deferr · #2 10-26-2005, 03:36 PM

don't have much experience with this engine but possibly an alda adjustment would be helpful. I'm sure there will be a better answer to your question soon but maybe search for alda adjustment on the diesel discussion. There are oodles of information on this topic.

hopefully I can help
Dan

TX76513 · #3 10-26-2005, 03:42 PM

Quote:

Originally Posted by dejan007

I am new to the Forum, my very first post. Hope that you folks can shed some wisdom and knowledge my way. Bought my first Mercedez ever, very excited about that, car runs great, diesel starts right up, but you could floor the gas pedal and the car goes nowhere. Very slow pickup couple of miles per hour until it hit 20mph, and then the darn thing kicks in and drives fine?? I would really, really appreciate some wisdom from you folks on where to begin to repair this problem. Thanks, Love this site!!!!!

Your problem is you are pressing the gas pedal and it's a diesel

First question, have you driven a diesel car before?
Also, do a search for "banjo bolt" and do you know when your primary and secondary fuel filters were changed, airfilter?

dejan007 · #4 10-26-2005, 03:56 PM

Thank you!! I really appreciate the information. This is the best thing since sliced bread, the folks here are really top notch, and kudos to all of you for your efforts in dealing with newbies like me. I am new to the diesel, and to mercedez. I guess I will live with the lack of power off the line, I LOVE the car and best of all I LOVE the diesel and the fuel mileage it gets....thanks a million for all your help. I will check the filters, they have not been changed since I purchased the 84.

Nate · #5 10-26-2005, 04:29 PM

Not trying to be a jerk, but when did you buy it, and do you know when the P/O last changed the filters?

~Nate

dannym · #6 10-26-2005, 04:54 PM

performance issues are first addressed by checking timing chain stretch. This is straight from the manual.
Check post #13 here:
http://www.peachparts.com/shopforum/showthread.php?t=135159&highlight=chain

Also make sure this line is clear:
http://www.peachparts.com/Wikka/BanjoBolt

You have a lot of research to do. get some kind of manual. Even a Hayne's for now. Start on a maintenance schedule. make a list of repairs needed.

Danny

Brian Carlton · #7 10-26-2005, 05:36 PM

First you must determine if the vehicle is behaving normally for a diesel, or whether it's truly slow on launch. This is best done by driving another W123 for comparison.

Then, if it is slow, the most important things to check, in sequence, are the following:

1) Valve clearances
2) Cam timing (chain stretch)
3) Injection timing

Once all of those are set properly, then you may consider additional fuel by adjustment of the ALDA. But, without verification of the three points, above, I would not make any ALDA adjustment.

junqueyardjim · #8 10-26-2005, 06:15 PM

Take it to a quiet place, a lonely country road which is nice and straight and level and without much traffic. Us a digital or a watch with a second hand and just do a couple of real fast starts - just as fast as it will go. If you can get it to 60mph at close to 15 seconds without the A/C on, your close to getting all Mercedes built into it. If you are in the 20 to 25 second time frame, it has to be adjusted.

t walgamuth · #9 10-26-2005, 07:04 PM

with jim and all above mostly. but in the end a 617 turbo diesel will always feel a little sluggish off the line. about the time you are clearing the intersection on a two lane street you will get a rush. after pushing as hard and jerking your head forward and back to make it go.

there are two turbo brands, kkk and garret (i think) in any case one will be more of a continuous torque increase the other will be more peaky as i described.

and sometimes you get a fault and the car takes off in second. then you will push so hard you may bend something trying to get up to speed in traffic.

tom w

dejan007 · #10 10-27-2005, 08:13 AM

Thanks again to all that have helped in giving me the much needed information to get me started. I will take everyone's advice and i am off to do some preventive and preliminary maintenance on the vehicle. I will let everyone know how things pan out, thanks again.