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  #1  
Old 12-21-2006, 05:40 PM
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W126 transmission flaring and brake issues

Hello everyone,
I have some transmission issues and some brake issues.
Transmission:
It flares between some gears expecially when it is cold. Also, a clunking when it downshifts. I have seen a lot of stuff on the board recently (I have read almost all of it) and I am very confused. I think that I need pics to help me out.

Brakes:
I had the rear brake pads done last June. The brakes have no give in them at times. Especially at slow driving. The brake pedal is stiff and the car really doesnt react to the stiffness. But when the car is going about 30 mph, it is fine and the pedal has some "give" to it. Maybe it just needs a brake fluid change?

I would really like to fix these issues. If anyone can help me it would be great. I know that some people are going to get mad when they see another tranny clunk thread but I have not found a thread with pics that I can follow. I think that it has to do with the EGR (what does it stand for?). So, I am a little lost with the issues. Thanks

DK

1983 300sd 5 cylinder
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  #2  
Old 12-21-2006, 05:44 PM
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Quote:
Originally Posted by dougk View Post
I think that it has to do with the EGR (what does it stand for?).
DK

1983 300sd 5 cylinder
Exhaust gas recirculation valve
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  #3  
Old 12-21-2006, 05:51 PM
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Insufficient vacuum generation or a vacuum leak could cause both of these symptoms. I'd hook a gauge to the system with a hose running into the passenger compartment and watch it while starting and driving. If you have a strong correlation between the vacuum generated and the symptoms, you've probably found the cause.
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  #4  
Old 12-21-2006, 05:56 PM
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With regard to the flaring, is the EGR still connected?

Have you found any of my posts regarding disconnecting the EGR and all vacuum lines to and from the black box on the valve cover?

This would go a long way to assist in reducing the flare.
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  #5  
Old 12-22-2006, 11:56 AM
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I will go get a gauge and check the pressure. Where should I put it in?

Is the EGR the black box on top of the valve cover? If it is I believe that it is all hooked up. What is the reason for it if we just unhook it?

Thanks again, I hope that I just have a vacuum line that is bad.

DK
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1983 300sd 253,000 + 13,000 (10,000+ on veggie and biodiesel)= 266,000
1983 300sd 390,000 (Leaky windshield seal) Known to me as the shower car. Parts car now!
1 junk 300sd Watch out for the skunk that lives underneith it!
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  #6  
Old 12-22-2006, 12:07 PM
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Not only check the lines themselves, but also their rubber connectors. After all these years, they get brittle. Give them a little bend, and if they have cracks, replace them - a standard vaccum line from an autoparts store will do fine.

The EGR is not the black box on the valve cover. When looking at the oil fill cap, go to your left about 5 inches.
Good luck!
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W126 transmission flaring and brake issues-300d-egr.jpg  
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Last edited by Larry Delor; 12-22-2006 at 12:14 PM.
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  #7  
Old 12-22-2006, 12:14 PM
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Quote:
Originally Posted by dougk View Post
I will go get a gauge and check the pressure. Where should I put it in?

Is the EGR the black box on top of the valve cover? If it is I believe that it is all hooked up. What is the reason for it if we just unhook it?

Thanks again, I hope that I just have a vacuum line that is bad.

DK
The black box on the valve cover has the valves that control the EGR. Frequently they leak and cause shifting issues that generally result in firm shifts.

If you are disconnecting the EGR, you can cleanup the underhood environment and eliminate any leaks via the valve by removing all the lines to and from the black box.

Search on my name and use EGR as the description for all the info you need.
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Old 01-25-2007, 08:40 AM
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Mine did it for a while but my cable that senses the transmission throttle possition wasn't on. That's the only cable that hooks to the throttle linkage above the valve cover. Also, make sure it's tight. No slack.
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  #9  
Old 01-25-2007, 11:40 AM
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I will take a look at it in March. I dont go home and see my car until then It wouldnt start on a 5 degree morning to bring it to college so now I am carless at college.

DK
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1983 300sd 253,000 + 13,000 (10,000+ on veggie and biodiesel)= 266,000
1983 300sd 390,000 (Leaky windshield seal) Known to me as the shower car. Parts car now!
1 junk 300sd Watch out for the skunk that lives underneith it!
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