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Old 01-07-2009, 06:12 PM
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Join Date: Aug 2008
Posts: 18
84 300 SD cold misfire

My 300 sd misfires or stumbles every few seconds until it warms up. I replaced the glow plugs and it still does it.
Should I replace the injectors? Motor runs perfect other than that.

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Old 01-07-2009, 08:18 PM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
I would start by adjusting the valves. If that was not an issue then perhaps you could send your injectors out for a test. No sense buying replacements unless the present set are bad.

If your fuel milage is also substandard make sure your base injection pump fuel supply is in the right pressure range. This can effect idle it appears. Also you might even be proccessing a little air after initial startup. Chain stretch with cam and injection pump in poor time is also a possibility. Just lots of possibilities.
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Old 01-07-2009, 08:31 PM
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Rollin' on 16s
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
Mine does this exact same thing. The idle is also low at start-up. All my GPs are new too. I may pull out the injectors and test them this weekend. I'll post back with the results.

1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
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