Too much air not enough fuel? - Diesel Bombers

12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

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Old 01-29-2013, 09:56 PM
Diesel Fan
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Join Date: Oct 2012
Location: Salem,IN
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Default Too much air not enough fuel?

I think im in need of bigger injectors not 100% because im a newbie but i have a good understanding the truck is a 95 12v 5spd 4x4 withAftermarket IC boots with constant load clamps AEM dry flow with custom intake 370 Maine injectors Tork Technology OFV 4gsk 181 Delivery valves he351ve 6.7 turbo ARP studs South Bend Clutch 3250 plate load 1 3/8 input shaft 4" exhaust and 5" tip Isspro gauges pyro/boost/fuel pressure and drive pressure gauge i dont have any ide what i should bump up to but i get more black smoke than white but still white puff. Pretty sure thats too much air. Hell idk any help is always appreciated

Last edited by TornadoDodge12v; 01-29-2013 at 10:12 PM. Reason: needed re wording
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Old 01-29-2013, 10:04 PM
BramanteCummins's Avatar
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Errr white smoke isn't good.... What's your timing at? With those injectors it should be a smokey hot pig. Marine pistons?
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Old 01-29-2013, 10:09 PM
Diesel Fan
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Join Date: Oct 2012
Location: Salem,IN
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Well as far as ive been told shes at stock timing.. its not tremendous amount of white smoke but def a puff. And thats what i thought with marines being the dirtiest inj you can get out there but i figured maybe its bc she is gettin a lot of air with nit so much fuel its gettin jessuped soon antways he can hook me up like a tow truck

---AutoMerged DoublePost---

Oops didnt realize i put.more white smoke than black. Lol im a little hazy it isnt rhat at all

Last edited by TornadoDodge12v; 01-29-2013 at 10:09 PM. Reason: Automerged Doublepost
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Old 01-30-2013, 06:40 PM
Diesel Fan
Join Date: Jan 2013
Location: The Delta
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Is your transfer pump pressure good? Are your rpm at idle normal or low also? you may be starving the injector pump. or have a leak that is letting air in the fuel system. if you have another vehicle to drive you can take or send your injectors to a shop that can test and flow match them or provide another set if some are bad. mast shops that do it will test for pop and pattern for free. and an injector install kit is around $35. hope its not too bad. having a similar problem myself waiting for new transfer pump.
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Old 01-30-2013, 10:16 PM
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Fox Fox is offline
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Join Date: Oct 2011
Location: Orlando, Fl
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Sounds to me like you have a clogged line or bad lift pump. Or bad OFV.

I am running a super HX40/35 hybrid, Ported head/manifold/intake, 19* timing, back cut valves... basically things to make a DECENT amount of air flow... 45-50 lbs of boost depending on temperature.

I still can dump pure black smoke on my stock 1994 160hp pump injectors. Though I am running a 2095 mack plug... but still. 370s will just fog out a highway with no problem...

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