Great Idea! I will go try that right now! brb

No it doesn't. It revs and stays. Does not go back to idle. So linkage problem huh? How do I fix this? Do I just adjust one of the bolt?

Have your helper step on the pedal and signal you when the idle drops, or if there is a change on the linkage when the idle drops as you observe the linkage move around in the engine bay.

Something is probably sprung too tight maybe that's also what's causing the idle to drop. Check the spring on the linkage close to the firewall, near the oil filter housing.

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I will do that tomorrow. It's dark now in the east. I will have to look at the linkage and see if there's a change. My helper won't be able to tell me if the rpms drop since I don't have a reading on my dash. Just a non-working clock ha.

digi

Then go by what you hear in the engine bay. How did you determine that the idle drops in the first place?

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Yeah. I went by what I heard from the engine. I just hope it's visual so it'll make it a lot easier to detect the problem.

Ok I didn't see the linkage move back after my helper held the pedal down... So what else can it be? Would a clogged secondary filter be the problem? I changed the primary yesterday. Also, the car is idling a little roughly at times. Is there anything I can do about that?

I have the whole day today to work on the car. So it'll be quite interactive. Any help would be greatly appreciated!

Yes, swap out the secondary filter. Before you install it, fill it with fuel then screw it on. Check the rubber "O" rings on the banjo bolt for "rubberness". Replace if they are hard.

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83 SD

84 CD

Do the "O" Rings come with a replacement filter or do I need to buy that separately? Ok, I'll go ahead and install the filter first before messing with anything else.

Ooof looks like your throttle bushing mount is really rusted! I just had to replace that bushing on my TD....there is a resin ball behind the mount that snugs up aganist the firewall...check to make sure this is still intact and that the mount is actually holding the bushing firm.

I bought a replacement from Phil - it was like $50

I also found out that I could fabricate a temporary one out of a big washer and a couple of flat o-rings (to dampen vibration) for about $3, but I only used that for a few days until I got the actual part in place.

Once I did the replacement, I had to adjust some of the linkages. I started at the one that links the assembly that tops the valve cover to the IP and stop lever. just lengthened them a little bit. Once I did that, I had full throttle with the pedal down.

Much better off the line acceleration.

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT

No, your local autoZoo will have something tho. I bought a box of various sized metric "O" rings, they'll be in there.

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Ok great! I'll buy a box of metric "O"s too. I'll be back. Need to drive over to pick up the filter and the "O"s. thx

If there's anything else I need to pick up, let me know. I'll check the thread on the road.

Pick up some injector cleaner, that is what I use to fill up the filter.

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Any specific injection cleaner?