I posted this in the second gen 12 valve section but havent gotten a responce so I thought I would try asking here. As I know alot of you have messed with P pumps.

I am working on a friends truck it is a 97 3500 4x4 dually auto. The truck is stock and has never been turned up. I know it is heavy compared to my first gen but this thing is slow. I took it for a ride and when floored there is little to no smoke at all. Then all of a sudden when it gets to 2500 rpm there is a huge cloud of black smoke that comes out and blacks out the whole street. Now when it does this there does not seem to be any change in power. also it dosent smoke like that every time sometimes you can hold it to the floor and it wont smoke a drop the whole time. The guy that owns the truck says that sometimes when he takes off it feels very powerful and then he will stop and take off again and it doesent have much power at all. I just changed the fuel filter and installed a fuel pressure gauge. There is 22 psi at idle and 38 or so at 2500 so I dont think that fp is causing it. I am not to familiar with how a p pump works I have only messed whith my ve before. I know the ve has a fuel pin and if it was my truck I would be looking to see if the fuel pin was stuck and to make sure there wasnt a boost leak in the line to the afc housing. But I am not sure how this thing works exactly. Sorry for the long post but I wanted to describe the problem as best I could.

 

There is no fuel pin, but a fuel plate. I dought that would be the cause though. It deffinatly sounds like a fuel problem. Need to have the injectors checked. Would b the first place id start. An with it being an auto I wounder if the tranny is slipping could be possible i guess. Hope this helps.

 

The trans is new and so is the converter.

 

I have a 97 & the convertor broke apart & was jamed in the exhuast pipe something to check

 

Parts from the converter made it into the exhaust pipe?

 

Catalytic converter I would assume.

 

lol, that converter never crossed my mind.