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-   -   84 300 SD cold misfire (http://www.peachparts.com/shopforum/diesel-discussion/242096-84-300-sd-cold-misfire.html)

jet4power 01-07-2009 06:12 PM

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.

barry123400 01-07-2009 08:18 PM

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.

bgkast 01-07-2009 08:31 PM

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.


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