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Technical Info: 2nd Gen 12 VALVE DRIVETRAIN Technical discussion of second generation (1994 - 1998) 12-valve engine and drivetrain questions, solutions and upgrades.
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  #11  
Old 11-20-2006
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MAXTORQ MAXTORQ is offline
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Default Re: Sputter, Cackle, Miss during engine rev!

Not to sound like I'm perfect . But it's at 14.5 . [img]/forum/images/%%GRAEMLIN_URL%%/cool.gif[/img]
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  #12  
Old 11-20-2006
moneymaker44 moneymaker44 is offline
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Default Re: Sputter, Cackle, Miss during engine rev!

whats your fuel preasure ??????

under load in gear or slow rev it comes up smoothly . but you could be out running your lift pump on no load quick rev .

what baffels me is the rough idle and miss have you checked your valves / valve lash increase in timing could have your valves a little tight now.

um Max did you guys Gap the spark plugs correctly LOL
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96 3500 ext cab auto 3.54 gear
100 plate 3/4 forward, boost elbow. torque lock switch ,BHAF,boost & pyro guages.kdp killed. AFC stuff done, 3k gsk .hush ring missing,4" exhaust , Goerend Brothers billet trans with triple loc converter and trans . new 5x12 injectors, DV's and .075 Barrels ,fire rings . timing 16* and just a turbo away from complete
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  #13  
Old 11-20-2006
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Default Re: Sputter, Cackle, Miss during engine rev!

That's the next thing to get ck'd in the AM. Ran late today on it. [img]/forum/images/%%GRAEMLIN_URL%%/cool.gif[/img]
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  #14  
Old 11-20-2006
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Default Re: Sputter, Cackle, Miss during engine rev!

I'll take a semi-educated guess [img]/forum/images/%%GRAEMLIN_URL%%/wink.gif[/img] I'd say, it's your turbo and injectors, causing it. Similar to pulling trucks, that need to build boost before a pull. When just hitting the skinny pedal, theres no boost to help burn the fuel you're dumping in, yet when under load, the boost comes up and away you go. The more you advance the timing, the earlier the fuel is injected, which means more unburned fuel, causing your poor performance.
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Motor; BHAF, #100 fuel plate. AFC mods. GS shimmed. 306hp/743tq
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  #15  
Old 11-20-2006
moneymaker44 moneymaker44 is offline
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Default Re: Sputter, Cackle, Miss during engine rev!

if thats the case you might can go 16 on it after all [img]/forum/images/%%GRAEMLIN_URL%%/cool.gif[/img]

just does not make since other wise

only other thing i would guess is air in line meaning one is getting air in it (i am sure you checked that one already) white grey smoke warm raw fuel vapor
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96 3500 ext cab auto 3.54 gear
100 plate 3/4 forward, boost elbow. torque lock switch ,BHAF,boost & pyro guages.kdp killed. AFC stuff done, 3k gsk .hush ring missing,4" exhaust , Goerend Brothers billet trans with triple loc converter and trans . new 5x12 injectors, DV's and .075 Barrels ,fire rings . timing 16* and just a turbo away from complete
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  #16  
Old 11-20-2006
moneymaker44 moneymaker44 is offline
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Default Re: Sputter, Cackle, Miss during engine rev!

and racer 9 does have a point as well .

slide the 10 plate towards stock and see what happens even though he does have the HX-40 on his truck.
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96 3500 ext cab auto 3.54 gear
100 plate 3/4 forward, boost elbow. torque lock switch ,BHAF,boost & pyro guages.kdp killed. AFC stuff done, 3k gsk .hush ring missing,4" exhaust , Goerend Brothers billet trans with triple loc converter and trans . new 5x12 injectors, DV's and .075 Barrels ,fire rings . timing 16* and just a turbo away from complete
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  #17  
Old 11-20-2006
tough85bronco tough85bronco is offline
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Default Re: Sputter, Cackle, Miss during engine rev!

Thanks for all the replys, MAX and I will get into it again here in the next few days and test all this stuff to see where it is at. I will change the fuel filter tomorrow though! I think it might just be what Racer is talking about. Just doesnt burn it well without the boost pressure! There is alot of fuel going in, But here is a food for thought, It didnt do this with the fueling mods all the same and the stock HX-35! Weird huh, Only started after I installed the 40!
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1996 3500 ext cab dually 5 spd manual 4x4 w/ 4.10 gears and 199,500 @ 14.5* timing. Silencer ring MIA, BHAF, HX-40 turbo #10 TST Plate Full Forward, 4K Gov Spring, 370 bosch Injectrs, 60# Exhaust valve springs Red Lining at 4500, 4" MBRP straight pipe w/ hx40 DP, Autometer ultra lite full gauges South Bend Con OFE. 1997 + 2005 Daully CTD's with minor UPGRADES by MAXTORQ
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  #18  
Old 11-20-2006
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Default Re: Sputter, Cackle, Miss during engine rev!

Oh and Joker, The idle isnt rough at all! its just when you rev it without load it does this, Idles GREAT!
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1996 3500 ext cab dually 5 spd manual 4x4 w/ 4.10 gears and 199,500 @ 14.5* timing. Silencer ring MIA, BHAF, HX-40 turbo #10 TST Plate Full Forward, 4K Gov Spring, 370 bosch Injectrs, 60# Exhaust valve springs Red Lining at 4500, 4" MBRP straight pipe w/ hx40 DP, Autometer ultra lite full gauges South Bend Con OFE. 1997 + 2005 Daully CTD's with minor UPGRADES by MAXTORQ
1999 Kenworth T800 N14 500 HP Cummins!
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  #19  
Old 11-20-2006
moneymaker44 moneymaker44 is offline
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Default Re: Sputter, Cackle, Miss during engine rev!

my bad miss read the post then i will again say check valve lash but it sounds like you have a over fuel issue going on . white gray smoke is warm unburnt fuel . with a load it runs ok then maybe the 40 does not spool quick enough. need to slow the flow of fuel a little until the 40 can boost. turn the star wheel back a bit(add preasure to the spring ) this may help with low end over fuel
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96 3500 ext cab auto 3.54 gear
100 plate 3/4 forward, boost elbow. torque lock switch ,BHAF,boost & pyro guages.kdp killed. AFC stuff done, 3k gsk .hush ring missing,4" exhaust , Goerend Brothers billet trans with triple loc converter and trans . new 5x12 injectors, DV's and .075 Barrels ,fire rings . timing 16* and just a turbo away from complete
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  #20  
Old 11-20-2006
tough85bronco tough85bronco is offline
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Default Re: Sputter, Cackle, Miss during engine rev!

I wonder If I can adjust it by backing the starwheel down a little to limit pre boost fuel, Not the plate because that is after boost, but the starwheel might solve it! [img]/forum/images/%%GRAEMLIN_URL%%/laughing.gif[/img] [img]/forum/images/%%GRAEMLIN_URL%%/USFlag.gif[/img]
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1996 3500 ext cab dually 5 spd manual 4x4 w/ 4.10 gears and 199,500 @ 14.5* timing. Silencer ring MIA, BHAF, HX-40 turbo #10 TST Plate Full Forward, 4K Gov Spring, 370 bosch Injectrs, 60# Exhaust valve springs Red Lining at 4500, 4" MBRP straight pipe w/ hx40 DP, Autometer ultra lite full gauges South Bend Con OFE. 1997 + 2005 Daully CTD's with minor UPGRADES by MAXTORQ
1999 Kenworth T800 N14 500 HP Cummins!
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