Intermittent high idle??

[Montelski]

I am a newb to diesels. Truck runs great and has a new 12V motor in it. I have searched many forums looking for similar issues. It doe not act fuel related...Here is my issue....Drove it to the store and when I came out to start it, the engine would only run with the starter cranking and would die when the key went back to the run position. However, when I gave it some pedal, then the truck stayed running when the key was returned to the run position. Truck seems to start normally a day later. The issue I have is when I let off the throttle, the idle will stay high for a moment (1100-1200 rpm) before it drops to normal. It does not matter if the truck is in drive, park or moving down the road. So when I am coming up to a stop sign and take my foot off the accelerator, the engine RPM will drop and the I get an little burst of rpm then it will hang out at the 1100-1200 range for a second or 2 or maybe longer before it drops to the normal idle.Any ideas what to look for??I was thinking the TPS controlling a low idle solenoid but not sure if this thing even has a low idle solenoid.

[MnTom]

A 12 valve does not have an idle solenoid. Everything is mechanical so it sounds like your idle hanging is more of a governor issue than anything. Did the previous owner put a governor spring kit in it? If so the springs may be a bit tight or one side is not adjusted properly. Check out the two threads about the P7100 pump and spring kit install.

[Montelski]

A 12 valve does not have an idle solenoid. Everything is mechanical so it sounds like your idle hanging is more of a governor issue than anything. Did the previous owner put a governor spring kit in it? If so the springs may be a bit tight or one side is not adjusted properly. Check out the two threads about the P7100 pump and spring kit install.

Stock governor. I have driven this truck for about 5 months and it never behaved like this. I will check out the thread on the pump.

[ISX]

Wasn't the throttle cable a recall on these things? Maybe it is hanging or something. So you are saying when you let off it stops at 1100ish for a second then drops back down? If I read correctly and thats the case then you might watch the throttle cable next to the pump, have someone rev it up and see if the cable hangs for a sec then gets "unhung" and pulls it back to idle.

[Montelski]

Wasn't the throttle cable a recall on these things? Maybe it is hanging or something. So you are saying when you let off it stops at 1100ish for a second then drops back down? If I read correctly and thats the case then you might watch the throttle cable next to the pump, have someone rev it up and see if the cable hangs for a sec then gets "unhung" and pulls it back to idle.

No recalls available for my VIN. I always instill in people the "KISS" principle and yet I don't follow it myself. I feel like a complete heel right now. The throttle lever was hanging up on the plunger of the exhaust brake switch all of a sudden. Maybe that is why the newer ones have a whisker style switch. Thanks for pointing me in the right direction:)