Surging issue please help - Page 2 - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #13 of 18 (permalink) Old 05-27-2019, 07:05 PM
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I think that's a fine idle but as it was mentioned its personal preference. You'll find it will drop a little of the ambient temp is high (100+) or if it's cold out.

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91.0 D250 A727 w/ 216k on the clock. i/p replaced 20k ago, lift pump 2k, 1 turn fuel, 2 turns smoke, ground & polished AFC pin, timing bump, 366 spring 94 2500 4x4, 49k miles, Farrell Diesel rebuilt 215 pump, PDD 5x12 SAC, SXE 362, built 47RH
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post #14 of 18 (permalink) Old 05-31-2019, 03:15 AM
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I set my idle a touch higher, the brakes are better with more vacuum, starts better too, less cold idle haze as well. Set it where you like it.

1994 single cab 4x4 2500 auto, black linex premium covering entire truck, rear frame blasted and por15'd, Firestone airbags, 35" good years, 3/4" spacers, longer rear wheel studs.
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post #15 of 18 (permalink) Old 05-31-2019, 05:14 AM
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Originally Posted by hemirunner426 View Post
Looking at the tach and the sound of the engine tells me the idle is way too low. The tach is not 100% accurate but you want to be somewhere above the last line before the 1k mark.

The engine will surge if idle is too low. Basically the governor can't properly regulate fueling below its rated RPM.

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Nailed it! I was going to respond to this. I used to rebuild P-pumps, and seen a few pumps if adjusted properly, could have remained in service. If the timing and idle get adjusted on these pumps after they wear in, you can keep them in service a bit longer.
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post #16 of 18 (permalink) Old 05-31-2019, 09:40 AM
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Originally Posted by aviomech View Post
If the timing and idle get adjusted on these pumps after they wear in, you can keep them in service a bit longer.
Tickled by this. My theory is if you refrain from junk "alternate fuels" (atf, used motor oil and 2SO), and only use a fuel additive for anti-gel the "bit longer" amounts to nearly 1.4 million miles and still counting.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
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post #17 of 18 (permalink) Old 05-31-2019, 11:33 AM
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Tickled by this. My theory is if you refrain from junk "alternate fuels" (atf, used motor oil and 2SO), and only use a fuel additive for anti-gel the "bit longer" amounts to nearly 1.4 million miles and still counting.
WOW! I'd love to make that mile marker!

I'd say 90% of the pumps I rebuilt were due to dirty fuel. Plungers and barrels would look like 40 grit sand paper was used on them. I cannot preach enough about using a quality fuel filer and good, clean fuel.
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post #18 of 18 (permalink) Old 06-06-2019, 11:56 PM Thread Starter
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its fixed now idle adjustment worked. and fuel filter was dirty

1997 california 12 valve cummins
mods so far... egr delete, coi, stock exhaust straight piped... list will expand
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