12 valve intermittent power & throttle response loss

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#11

01-14-2009, 09:43 PM

haulitrite

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The pedal feels the same all the time.

When I start it after it dies it will start just fine.

The only time it dies is if I let off the pedal. If I just keep my foot on the pedal it won't die after it gets done lugging.

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I don't know what or where the AFC is and don't understand it's function.

Last edited by haulitrite; 01-14-2009 at 09:43 PM. Reason: Automerged Doublepost

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#12

01-14-2009, 11:16 PM

Bruce05

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sounds like it could be starving for fuel. might have a rubber hose comin apart inside. had that problem on a 1983 peterbuilt i ran for a while

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#13

01-15-2009, 01:15 AM

Dr. Evil

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Quote:

Originally Posted by haulitrite

After about 5 min of driving the motor will stay in one RMP range and sound like a jake brake is on. If I let of the pedal it wont idle down for about 3-5 seconds. When i does finally idle down sometimes it will die.

Quote:

Originally Posted by haulitrite

One time when it did this I let off the pedal and put the trans in neutral......Big mistake......The engine ran to the red line out of control until I shut the key off.

Both of these statements lead me to believe its an issue with the pump.

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#14

01-15-2009, 01:19 AM

Dr. Evil

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The AFC is the Aernoid Fuel Control and it basically controls smoke until the boost comes on. Its the housing just behind the injector pump. You can see it here:

https://www.dieselbombers.com/5-9l-1...uel-plate.html

https://www.dieselbombers.com/5-9l-1...-12-valve.html

Im wondering if the Governor springs could have anything to do with this?

Last edited by Dr. Evil; 01-15-2009 at 01:35 AM.

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#15

01-25-2009, 06:02 PM

haulitrite

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thanks for the info. that was very helpful

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I took the truck into a diesel shop and they said it was a seal or gasket bad in the p pump

Last edited by haulitrite; 01-25-2009 at 06:02 PM. Reason: Automerged Doublepost

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