Idle speed lower after diesel purge - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 01-29-2011, 12:30 PM Thread Starter
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Date registered: Jan 2011
Vehicle: 1984 300SD - 258,000
Location: Bay Area
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Idle speed lower after diesel purge

I just ran diesel purge through my 300SD a couple days ago and I've noticed that upon starting it idles at around 550 to 600 rpm where as it should be idling at 750 to 800. During this low idling I can also feel a surging from the engine, but once up to operating temperature it idles at the correct speed.

I'm contemplating adjusting the valves as I ran the diesel purge to try and fix and nailing sound that was coming out of the injector, the purge cured it but now the low idle is here to take its place. Anyone have any clue what it could be or what could be done to fix it? Any help would be greatly appreciated.

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