Changed lift pump and truck won't go over 1500rpm

[dheavychevy38]

Just as it says changed the lift pump on a 99 6.5 and now she won't go over 1500 rpm or 30 mph bleed the air but still has a miss ?

[dheavychevy38]

I just tried to bleed the air again and same thing with the rpms and miss ?

[dheavychevy38]

Put a scanner on it and there two codes one for injection cam timeing and the other one I couldn't get off the scanner cause the batt died. The first one I have had on another truck before and it was air in the line comeing from the lift pump. Going to pull it back off and check the orings and tightness. Any ideas would be great? Thanks in advance Denny

[dheavychevy38]

Well it was the vaccum pump cause no turbo

[dheavychevy38]

Well that didn't fix it but it was junk. Got the scanner going and am getting p0251 and p0370. From what i searched it is most likely pmd,ip or wiring issue. All the wiring is in good shape and all the grounds i redid lastnite along with the batt cables with no success. Now on to pmd or pump. Can you just plug in a pmd to test it ?

[hatzie55]

I don't think I'd plug one in without some kind of heatsink. Power transistors heat up quick.


Well that didn't fix it but it was junk. Got the scanner going and am getting p0251 and p0370. From what i searched it is most likely pmd,ip or wiring issue. All the wiring is in good shape and all the grounds i redid lastnite along with the batt cables with no success. Now on to pmd or pump. Can you just plug in a pmd to test it ?

[JohnC]

If the problem started when you changed the lift pump, I'd look long and hard at the pump...

[dheavychevy38]

Turns out it was the ip pump.