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Not making boost as of recently.


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A few days ago truck didn't seem to make boost like it used too; I figure it was the fuel filters so I didn't worry much and just finished swapping a new gas tank, Vulcan filter kit, 1/2" fuel line from the tank to Vp, and threw a new lift pump on (same Walbro 392). Before I had 23 psi idle and 19 under a load; with no changes to the bypass I now have 20 psi at idle now and I can't get the truck under a load.I see under 10 pounds of boost when before this occurred it would peg the 25psi gauge.1594,0463,1492,1693 are the codes displayed on the dash.Any ideas? I'm praying the VP is okay. Turbo is dirty from the old oiled air filter on it but no shaft play.

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I am not the electronics wizard here by any means, but from the codes your alternator might be putting out to much juice. Thats where I would start checking. It could be creating enough havoc to cause the engine to defuel and that will lower boost. Go over to the articles section and look under 24v at the OBDII error codes. I cant seem to link anything anymore.

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1594,0463,1492,1693 are the codes displayed on the dash.

P1594 http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/220-p1594-charging-system-voltage-too-high P0463 http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/189-p0463-fuel-level-sending-unit-volts-too-high P1492 http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/218-p1492-ambient--battery-temp-sensor-too-high Run the tests to hopefully aid in finding the issue.

Turbo is dirty from the old oiled air filter on it but no shaft play.

I would check all the tubing for oily dirt and clean everything out. As for the compressor side of the turbo just pull the outlet tube and the use your favorite degreaser. I would prefer to pull the turbo and remove the compressor housing so to clean the housing properly and the compressor wheel with like a paint brush and solvent.

I see under 10 pounds of boost when before this occurred it would peg the 25psi gauge.

I would build a boost leak cap place it on the turbo and pressurize the air system with 10-15 PSI and listen for leaks. It could be a simple bolt is missing to a boot the slipped off some what.
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Thank you! I have a good deal of diagnosing to do.

As for a scan tool, any suggestions?

- - - Updated - - -

And for the 0463- I do not have the sending unit connected to the computer. That was my next research project figuring how to wire in the new Dodge fuel level sending unit.

For the time being I'll looking into the battery, alternator, and look for leaks.

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Thank you! I have a good deal of diagnosing to do.

As for a scan tool, any suggestions?

- - - Updated - - -

And for the 0463- I do not have the sending unit connected to the computer. That was my next research project figuring how to wire in the new Dodge fuel level sending unit.

For the time being I'll looking into the battery, alternator, and look for leaks.

Here you go... This is the replacement sender.

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/25-fuel-system/236-fuel-gauge-replacement-sender

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When you pull the sender out just unplug the sender from inside the sender. Then pull the locking tab out of the plug and the assemble the new sender into the same two ports in the plug. snap the sender to the base and plug back in. I can change them in under 1 hour that includes pumping the tank dry and dropping the tank.

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I need to get my info into the sig. This is in my 83 Ford Cummins swap- the sender is mounted in the tank and functioning per my multimeter test; I just need to figure where to splice in the two wires from the sending unit into this harness.

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