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Old 03-22-2000, 10:38 PM
Posts: n/a
My 300D with 240K miles runs
just fine when I rev it or drive on the road, but when it drops rpms down to an idle, the
engine may start jumping, missing, and idling
rough and also blows exhaust smoke heavily.
It runs just fine on the road, but takes
these 'spells' idling very rough. It's not
all the time on idle, just at times. The idle is set where it should be. I've also cleaned the injectors with LM Diesel Purge. Any ideas? thanks!

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Old 03-23-2000, 08:16 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The smoke part of your symptoms indicates that you have more than the idle stabilization (dampening)problem that has been talked about recently.

Our approach for your car would be to verify pump timing (we use a light that makes this as easy as a gas motor - measuring that is) and then pull the injectors for bench testing and check the compression before they go back in. With the injectors out the prechamber balls acn be inspected. In all 2-3 hours work.

If all of this is good you should take the pump out and send to a Bosch Diesel Service Center see:

Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician

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