Rough idle after new ve pump install.

[trucker_dad]

Iv got a 1990 d350 non intercooled,w/47rh conversion.
After the new pump install,it feels really responsive,tho jumpy and idles rough.
Changed the pump due to fuel leak,durty interiour of it.
Any ideas?

[RCCUMMINS89]

Is it smoky as well? Does it smooth out in the higher rpm?

[trucker_dad]

There isn't any white smoke.
seams real jumpy, like a hyper-active gouverner.

[trucker_dad]

Does south out better the higher the rpms.

[RCCUMMINS89]

Might be that the return springs in the pump are broken. It'll cause just that.

Was this a new pump, or a used pump that you got from someone?


Air pre lift pump can also cause a surge/rough idle.

[trucker_dad]

Brand new pump. I will try disconnecting the electric boost pump.

[trucker_dad]

Also, I'm going by sound only, I wanted to reduce idle speed.I backed the idle screw back a little bit but the control rod wouldn't allow the motor to idle down. Any internal adjustment?

[Remps]

Break the nuts loose on the throttle rod, and turn the rod either way to extend it or make it shorter.

[trucker_dad]

Thanks. I'll try that