12 valve intermittent power & throttle response loss

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Jan 14, 2009 | 09:43 PM

#11

haulitrite

Thread Starter

Diesel Enthusiast

Joined: Dec 2008

Posts: 155

Likes: 6

From: Wisconsin

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; Jan 14, 2009 at 09:43 PM. Reason: Automerged Doublepost

Jan 14, 2009 | 11:16 PM

#12

Bruce05

Newbie

Joined: Jan 2009

Posts: 4

Likes: 0

From: Amboy,WA

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

Jan 15, 2009 | 01:15 AM

#13

Dr. Evil

BOMBARDIER

Joined: Mar 2007

Posts: 23,293

Likes: 1,322

From: North of You

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.

Jan 15, 2009 | 01:19 AM

#14

Dr. Evil

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Joined: Mar 2007

Posts: 23,293

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From: North of You

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; Jan 15, 2009 at 01:35 AM.

Jan 25, 2009 | 06:02 PM

#15

haulitrite

Thread Starter

Diesel Enthusiast

Joined: Dec 2008

Posts: 155

Likes: 6

From: Wisconsin

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; Jan 25, 2009 at 06:02 PM. Reason: Automerged Doublepost