I had to to replace my fuel injection pump on my 1990 Dodge turbo diesel with a manual transmission. The large rear oring blew out on it.

I have installed the new injection pump and the only problem I am having is no turbo performance. Turbo worked fine on the old pump.

I purchased a new lift pump, fuel filter before running the new pump.
Turbo worked fine on the old pump.
Only new items to system are injection pump, fuel lift pump and fuel filter.

Vehicle info:
1990 Dodge turbo cummins diesel. manual transmission

Troubleshootiing so far.
verfied timing.
set engine at tdc cylinder 1
installed dial gauge
rotated engine counter clock wise as viewed from the front until dial stopped moving set indicator to zero.

Rotated engine clockwise to TDC cylinder 1
set pump at 0.551 inches should be equal to 1.4mm


Truck works fine in first 3 gears, no turbo in 4 or 5 even if floored. Also the truck NEVER smokes. you get a brief smoking on startup as usual. but nothing anywhere else.

I have verified no leaks in air system, both exhaust and intake. air tube has no leaks. you can feel pressure in the air tube with engine running and it disconnected. although I could not tell you the exact pressure in the intake manifold.

Turbo spins up with no load, but no whining. would not expect it too under a no load condition.

no play on the turbo.

Theories I have come up with.

The air/fuelpressure (Anaroid) regulator built into the pump is stuck.
Engine running in a lean condition.

I am up for suggestions as to what to look at next.

Thank You for you input.

 

Welcome to the DTR!!
Check out your waste gate and make sure it is hooked up under the turbo, mine came off once and had the same problem.

 

This is a non wastegated H1c turbo. Turbo seems to work through the first 3 gears only. I can hear it wind up. But nothing in 4th or 5th.

 

[QUOTE=riolobo69;1392382]...I am up for suggestions as to what to look at next...QUOTE]

Next you should look at the face of a boost gauge and tell us the psi in each gear, with the corresponding RPM and load description. A boost gauge will supply the essential data in fixing this problem.

 

would love too. no boost gauge, egt, no mods. Totally stock engine. Thanks for the input though. also no rpm gauge. Its that old.

 

That's a pretty good guess. I would check that out thoroughly. Do you know how to get in there?

There's nothing wrong with the turbo, you just aren't getting enough fuel to spool it.

 

been reading through the forums. found this. https://www.dieseltruckresource.com/...ferrerid=51955

Another suggestion was turn the fuel meter screw. located on the upper, back, engine side of the pump. 1 turn equals 5% increase.

Any reason the truck SHOULD NOT smoke?

 

It's possible the pump was set up weak by mistake. Before you tear into it, is there a warranty? I'd yank it off and let the pump shop fix it if there's a warranty - if you go messing around in there they will not honor the warranty.

A stuck aneroid (we call it the AFC) could certainly cause what you describe - but if it's a fresh rebuild it's the pump shop's problem.

 

called the shop today, and they majorly downplayed the AFC as being the culprit. I am majorly leaning that way as well. I believe the screw tey suggested playing wiht is called a compensator from other threads I have been reading. has a jam nut on it. Thought I would play with that to prove to the shop it is a fuel issue not a turbo issue.

Keep the suggestions coming please.

 

The screw in the top of the pump is the smoke screw, it won't have any effect on this problem.

If you want to check the AFC, take out the 4 screws that hold the AFC cover on, pull out the diaphragm that's under the cover, and look down the bore. When you pull on the throttle linkage, a little pin should pop out from the front of the bore. You can push it back in with a screwdriver to put the pump back together.

I would not mess with the main fuel screw yet.

 

The screw they reccommended playing with I believe is number 86, or 88 on http://home.comcast.net/~vwgtd/ve_blowup.jpg. look for 91, 88,87,90, 93 numbers looking left to right. Seems to be the Full Power Adjustment screw mentioned in http://dodgeram.org/tech/dsl/more_power/Power_ve.htm.

The pump is under warranty. and the 4 screws on the AFC have paint on them to show if it has been "tampered" with. Great for me.

Won't be able to do this until the weekend. But keeping all suggestions open.

 

Since it's under warranty I would pull it off the truck and make the guy who sold it to you fix it. Why void the warranty when the problem may be something beyond your ability to fix?

 

Pulled it and mailed it off yesterday. Hope they can find what is wrong with it now.

 

Recieved the pump back today. the note stated that the mid range govenor was set low. Does this sound right?

 

There's only one governor, so I don't know what he meant by that. I guess you'll have to install the pump and see how it runs.