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series 60 wont return to idle, intermittent,

My 1999 series 60 will sometimes not return to an idle. You will be shifting up through the gears or trying to downshift. Push in the clutch, let off the fuel pedal and the RPMs will only drop to 1200-1300. It doesn't do it all the time just every now and then , but seems to be getting worse. It will sometimes do it when the truck is just idling. It will just rev up to 1300RPMs and sometimes rev back down to idle and keep doing this. Sometimes the engine stays revved up and other times it slowly goes back down to idle. It does sometimes trigger the check engine light when it happens while driving and hopefully I'll have the code for you guys tomorrow. Engine is in a 2000 freightliner century. Does anyone think its the throttle position sensor? I have no experience with this at all never had a engine do this before. Any help would be appreciated.

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Rick I had throttle position sensor do that on my series 60 just before it quit working for good.

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Ok Mel, Thank you. I will replace it and get back you on how it works. I was wondering if that could cause it. I'm going to look at the codes tomorrow, does it have a code for the throttle position sensor? Also did you see my other post about trying to squeeze more fuel mileage out of my series 60? ( How to improve a series 60, Need more fuel mileage) I was wondering what your thoughts are on that issue. Maybe you could take a look at that post if you have time. Thanks again.


I believe it does but mine never threw a code it did just like what your talking for about 2 weeks then quit. I did see your other post on MPG I tried everything to improve MPG on my series 60 I spent several thousand dollars and had no improvement


Ok, thanks Mel. I really appreciate it.


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Rick will be eternally grateful.
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