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Old 12-21-2003, 10:46 AM
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Join Date: Dec 2003
Posts: 9
diesel backfire

My 1990 350 sdl with 145,000 miles backfires one time when it is cold a few seconds after it starts. Just started doing this and does it every time. Head and pump replaced @ 100,000 miles.

Help or my wife will stop driving.

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Old 12-21-2003, 10:58 AM
billrok's Avatar
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Join Date: Dec 2001
Location: Chicago area
Posts: 242
My 300SD stumbles for a few seconds when started up cold. It's been like that forever. I'm not worried about it. If you have a real big boom type backfire it's a different story. How bad is it??
Orland Park, IL
1985 300SD 215,000 miles
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Old 12-21-2003, 01:20 PM
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Join Date: Dec 2003
Posts: 9

Misses for a few minutes and pumps dark exhaust. Backfires one time then clears as it is driven a few miles. I have had gasoline engines backfire for eing lean, cracked head or burnt/broken valve but a diesel cannot run lean in th intake manifold or can it?
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Old 12-21-2003, 03:44 PM
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Join Date: Mar 2003
Location: SW WA
Posts: 5,741
I can only think that there may be a valve that may be sticking open sometimes. I broke an exhaust rocker arm on a Datsun diesel that I used to have. It happened to me while going to work. It still ran but it was backfiring back into intake. Ran like heck and was real loud but I was still able to limp back home at freeway speeds.

84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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Old 12-21-2003, 05:31 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,001
I'd try running some diesel purge through it. When was the last time it had an Italian tune up?
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