A while back, I read on this forum about a similar problem and it turned out to be the IP linkage was adjusted incorrectly. This caused the IP to run on the edge of cut-off and always needed revving to keep it running. He talked about disconnecting the linkage above and feeling for the detent.

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Sam

84 300SD 350K+ miles ( Blue Belle )

That's definitely worth checking, although any indy who missed that should never be allowed near anything with a tri-star again.

If you do need a new injection pump, check the junkyards/ebay. If you have a junkyard in your area that allows you to remove your own parts, I bet you can get an injection pump for less than $50. You also could try posting that you want the part in "Parts" section of the forum. There must be forum members w/ a spare injection pump who would part with it for less than $200.

If you're physically able, you really should consider doing your own work. Labor costs make these cars uneconomical for many of us. The injection pump on an 83 can be swapped without removing the oil filter housing, and there is plenty of support here to talk you through the job.

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Tjohn

82 300 SD
77 450 SL (gone)

Thanks for the linkage info. I'll look it up.

Thanks for the vote of confidence, too. I AM physically able and mechanically inclined. Depending on my results from the linkage search, y'all might be looking forward to a series of "Help me replace my IP" questions.

Please keep up the encouragement and ideas.

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1983 300SD, Silver/Blue, 230+K (rebuilt at 196K)

Timing, no. But, fuel delivery, yes. There's a return spring for that piston. If it got weak (or too weak for the viscosity of the fuel its being asked to pump), then the piston wouldn't be able to return and reload with fuel. That spring doesn't sound like it could cause the symptoms though.

A non-spring related cause could be grit or caustics in the WVO causing the piston to leak more fuel past it as it compresses it. And that would affect the idle because the pump wouldn't be able to generate sufficient injection pressures at lower RPM.

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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png

Broadband: more lies faster.

I priced IP Friday at $350 used on a salvage yard internet search. As a side note, when I broke down a guy said a pusher pump would help a weak pump do the job. May be an option to consider while waiting for a replacement IP. In my case, praise God, I was able to get up and running again with new filters.

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'83 300DT
'04 Forester XT--modified
'61 Beetle EFI Turbo
Burley recumbant

OK. At this point I'm planning to bring the car home and work on it myself. The best price I've seen for IPs seems to be on ebay - Buy it now with shipping around $250. Does anyone have any experience/lessons there?

I've got the digital manual, but can't find any details how to remove/install the IP. Does anyone have any links to share that would give me a step-by-step on replacing an IP?

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1983 300SD, Silver/Blue, 230+K (rebuilt at 196K)

BUMP - Can anyone help me out?

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1983 300SD, Silver/Blue, 230+K (rebuilt at 196K)

Seems like your next move would be a wrecking yard IP.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Here are a couple of links for reading:
http://207.210.95.34/~boostd/easley/iptiming.htm
IP Timing

I've never physically replaced the pump but someone who has should chime in soon.

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Sam

84 300SD 350K+ miles ( Blue Belle )

Thanks for the help and the links! After I get the car back home and get into it, I'm gonna need a lot more advice. Encouragement, if nothing else!

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1983 300SD, Silver/Blue, 230+K (rebuilt at 196K)