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  #1  
Old 04-22-2006, 10:00 PM
Registered goober
 
Join Date: Apr 2006
Location: Asheville, NC
Posts: 15
New to the family.

Hello, all.
Just purchased a 1982 300d last week. It's in great shape, but wasn't really driven much. Since I've had it, I've noticed a few issues:
1) Transmission pretty much skips 2nd (only stays in for a second), and the shift seems delayed. I added some trans-x, with not much result. I've looked throgh the forum, and found a few threads dealing with similar issues. Is this the common 1-2 shift problem? What's the fix?
2) Idles rough, and smokes a little. I just changed the air filter and both fuel filters, and I'm running it on (I assume) its first tank of bio. These caused no change. Is it easy to tune up? I'm slightly mechanically inclined, slightly.
3) Decided it won't shut off with the key. I know this is a common problem, and I'll probably end up making a pull cable stop. Any better ideas?
4) starting to jitter on the road, probably just needs an alignment... and quick.

thanks in advance.
Mike
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1982 300D, up to 152K
1990 Dodge W350 cummins diesel, 135k
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  #2  
Old 04-23-2006, 06:37 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 31,363
welcome aboard.

1. start with a fluid and filter change on the tranny. dont forget to drain the torque converter. often this will help if the tranny has not been taken care of. also there are adjustments that can be done. it sounds like you have some vacuum issues and this also can affect shifting.
2. soes it run roughly all the time or just when cold?
3. see vacuum problem. vac shutoff. if you have vac leak it wont shut off. this can be bad vac pump, leaky hoses, bad shutoff valve at injection pump and prob other things as well.
4. can you provide more detailed description of jittering?

good luck

tom w
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Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a Lotus 7 replica autocrosser with a modified K20 Acura engine.
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  #3  
Old 04-23-2006, 08:38 AM
Diesel Giant's Avatar
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Join Date: Oct 2004
Location: Loganville/Atlanta
Posts: 2,156
Welcome to the forums.

Lots of maintenance to do with all the fuids and filters. Try this is help with your vacuum problems.

http://dieselgiant.com/mercedesvacuumtroubleshooting.htm
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1981 300D 147k
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1979 300D 234k (sold)
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  #4  
Old 04-23-2006, 11:20 PM
Registered goober
 
Join Date: Apr 2006
Location: Asheville, NC
Posts: 15
thanks for the reply... I'm pretty green to the whole vacuum system thing... but I'll take a peek. The roughness only occurs at idle, as does the smoke... seems like idle is a bit too low, perhaps? The jitter occurs between 20 and 40mph, I think it's an alignment issue because the car pull pretty hard to the right. Could it be something else? thanks again.
Mike
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1982 300D, up to 152K
1990 Dodge W350 cummins diesel, 135k
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  #5  
Old 04-23-2006, 11:29 PM
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Join Date: Jan 2000
Location: PA
Posts: 5,440
mtadams,

How do the brakes work? Do they appear to have the proper amount of vacuum boost?

If the brakes seem OK, the engine driven vacuum pump is OK. So the vacuum problems are probably caused by a leak in the vacuum system.

P E H
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  #6  
Old 04-23-2006, 11:42 PM
Registered goober
 
Join Date: Apr 2006
Location: Asheville, NC
Posts: 15
the brakes are pretty solid. Leak in teh system, Huh? I'll look into it. The locks, when activated, slowly pull the tabs down. Is that indicative of a leak? whats the best way to deal with a leak? Thanks for your patience with my neverending stream of questions.
Mike
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1982 300D, up to 152K
1990 Dodge W350 cummins diesel, 135k
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