1986 190D 5-speed.

So there's a bit of mystery to my car. It loves to buck back and forth when accelerating between 1500 and 2k RPM. It doesn't do it if you super ease into the throttle but any abrupt change will make the car jerk. Here's a list of what's been done to try and solve this problem by the previous owner, but no luck so far:

-Replaced OVP relay
-Replaced Injection pump with a rebuilt unit
-Replaced injectors
-Replaced chain tensioner and guides
-Replaced clutch / pressure bearing / pressure plate / shaft bearing
-Replaced flex joint rear and front
-Replaced center shaft bearing
-New front shocks
-New motor mounts

Any ideas about what could be causing it?

Rear main seal leak contaminating the clutch?

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Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver)

Instagram: @maximed93

I have the previous clutch and it's not showing any oil contamination. Certainly doesn't feel like a driveline issue. It was doing it before the clutch was replaced.

Did you surface the flywheel?

If the clutch was replaced but the rear main was still leaking, it would start doing it again fairly quickly depending on the size of the leak.

Does it do this in neutral? Does it do it in every gear between 1.5K-2K rpm?

__________________
Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver)

Instagram: @maximed93

I don't know if flywheel was resurfaced. This doesn't feel like clutch chatter though. My previous e46 had lots of clutch chatter and you only really noticed that immediately after starting off.

It does not do it in neutral. Only while under load. Some days it's worse than others. It will not happen on first set off after releasing the clutch. If you're heading up hill with the engine cold it'll start off fine, but it'll then start bucking under load while pressing the accelerator. It clears out the closer you get to 2k RPM. It makes me think it's engine related and not driveline.

Also want to mention that the EGR has been deleted on this car. I see a plug where it would come off the exhaust header. Is there something else that should be plugged in terms of the intake? I'm new with the om602 so I'm not sure what to look for.

Turbo or NA

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

This to me would be a logical place to examine. I am not certain but you are in the transition area of the turbo engaging effect. That's is if you have one as asked. For example some odd waste gate issue.


This is only a quick thought.

It’s NA. No turbo.

Have you checked the timing chain for stretch?

__________________
Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver)

Instagram: @maximed93

I have not. Car has about 165k miles on it and I don't know if PO replaced the chain when he replaced the guides. I'll dig into the records.

I think there is supposed to be a little shock absorber on the injection pump linkage, is that missing? Dead and not effective? I've owned both a 123 with a five speed and a 1984 190D 2.2 with a five speed, and they both had the little shock. The purpose is to prevent a harmonic disorder between the engine and the IP linkage. When that little shock on my '84 190D died, I had the exact condition you describe.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

The little shock on my 190D was between the IP linkage and the intake manifold.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

Is this what you're talking about? #143?

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