Engine/Transmission (1998.5 - 2002) New VP44 and FASS now runs worse

[Clmsnow]

I had my VP44 go bad on me this last week and come to find out, my lift pump went bad as well. So, on goes the new VP44 and then rather than dealing with the bad lift pump, I get a FASS 95 system installed. However, I now feel like the truck is not as fast as it was before the pump failure. Seems like it doesn't throw as much smoke and takes longer to spool up the turbo. At first I realized the plate on the injector pump didn't pierce the line/wire, did that and it ran better, but still seems like I lost power. I was thinking with the new pump as the FASS system I would run better. I had the fuel gauge hooked up to the lift pump before so I haven't got it reattached somewhere new yet to see my fuel pressure. Any ideas??? It was fine before the new pump!?!?!

 

[raychem]

MAP and IAT sensors are famous for going bad. The map sensor could be a problem and give you symtoms like you mentioned above and not set off codes. I would clean the IAT or change them both... about 100. 00 at cummins.





Richard

 

[Doug1810]

IAT sensor at auto zone $21. 95 . The map can't find any where but cummins my self may be some one has .

 

[Clmsnow]

Yeah, but this all started right after the new VP44. Never any problems before. Any chance it is the wrong pump or something is not right?

 

[Cummins724]

I would run a ground from your battery to the air horn... . where you have the edge comp grounded & see if that helps. It is possible that you are not getting a good ground. There is a chance you have the wrong pump.

 

[Clmsnow]

How do I know if I have the wrong pump? I'l check into the ground wire.

 

[BLively]

i had the same problem once, had to send the comp back to edge to get it reflashed. hope you dont have to do that.

 

[Clmsnow]

How did it act when your Comp was bad? How do I know if I have the wrong pump?

 

[BLively]

it acted as if the pump wire was not tapped, but i had the cover and it was hooked up, but still acted as if it wasnt tapped

 

[Cummins724]

How do I know if I have the wrong pump? I'l check into the ground wire.

You need to call the seller & check the numbers on the top of the pump. I also heard stories of the pump wire not getting good connections or a bad connection on one of the plugs. Are you sure that all of your sublevels are set right? My truck doesn't run as well if I have my lower sublevels turned down. In detail... . if level 3 is set at 3x3... . I get less power on 5x5, but if level 3 is set at 3x5... . then I get more power when I turn the box on 5x5. The lower sublevels do effect level 5 performance.

 

[Clmsnow]

Very interesting about the sublevels. I had level 3 set at 3x3 and level 5 set at 5x5. So you are recommending putting level 3 and 3x5? If so what can I put level 2 at for a daily driver?



Either way, I think I found the problems. Seems that I had some bad connections with my Comp in the cab. Much better now. However, I have noticed of late that my boost is a little lower than normal. I use to hit 36 on level 3 and 40-41 on level 5. I am now 34 and 37, respectively. I started pooking around and found that there was a lot of oil residue on my turbo near the oil return line and there was even oil in the propellar area on the intake side. I didn't notice any leaks from the oil line itself, but it may be the gasket. Does this affect things are cause a problem?

 

[Cummins724]

Very interesting about the sublevels. I had level 3 set at 3x3 and level 5 set at 5x5. So you are recommending putting level 3 and 3x5? If so what can I put level 2 at for a daily driver?



I started pooking around and found that there was a lot of oil residue on my turbo near the oil return line and there was even oil in the propellar area on the intake side. I didn't notice any leaks from the oil line itself, but it may be the gasket. Does this affect things are cause a problem?

All lower levels should be set at 1x5, 2x5, 3x5, 4x5... . to get the most power from the 5x5 setting. I notified edge of the problem after reading a post on the subject & doing research while driving. You will notice a difference in performance. I know my Drag Comp does it, but not sure if the standard comp has this problem. About the turbo... . You may have a boost leak. The most common problem with the oil is residue from a oiled type air filter.

 

[Clmsnow]

No, this was oil from the turbo itself. I have an AFE, and I don't oil it. Should there be oil coming through the turbo on the intake side?