My newly-acquired 1995 E300D has the following symptom: mild oscillating speed variation when going at constant speed....as if a valve is opening and closing when it shouldn't be.

According to the PO, the pressure control valve (vacuum operated, next to the EGR) is operating strangely. My hope is that that's the problem.

My plan of attack is, for testing purposes, to disable the EGR and that valve control and secure that valve in a full open position per http://www.peachparts.com/shopforum/diesel-discussion/219264-easy-reversible-egr-delete-95-96-97-non-turbos.html. And to replace both fuel filters. And then see where I stand.

Any other ideas? Jeremy5848 has already given me a lot of good advice....but I thought I'd see if anyone else has thoughts and create a thread for any who have similar problems.

Thanks.

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

do the EGR block off and make sure the flapper valve is tied open too. Remove the intake manifold and give it a good cleaning too.

Also make sure your A/C compressor is not causing this feeling. It does lug down the engine a bit specially at low rpm when the engine is in lazy mode

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Thanks. AC not currently working (though I hope to address that).

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife