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  #1  
Old 10-10-2011, 09:16 PM
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Rammin Rammin is offline
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Default Erratic Idle = Throttle Position Sensor

Hey guys just wanted to share my success story with hopes that someone else will find the same solution to my problem.

I searched here on the board and found out that my erratic idle while driving would most likely have been two possible electrical options. The throttle position sensor (TPS) or the idle control valve.

Basically the truck felt like it was surging a few hundred RPMs during normal driving. Without pressing down on the accelerator any harder the truck would climb a few hundred RPMs and then level out again. Changed out a $40 sensor and the truck runs like new again.

Thanks for the great work on the site and hope someone else finds this and uses it with success too.
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  #2  
Old 10-11-2011, 01:01 AM
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SuperiorStyles SuperiorStyles is offline
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Congrats I figured mine out 2 years ago too
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Old 10-11-2011, 01:13 PM
Truckin Truckin is offline
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I have an 2011 Ram that idle will drop to 500rpm then bounce up to 700 or so and I think I can feel a surge when I drive sometimes to. Is this something that I can take to the dealer to have replaced ie. faulty part and if not what sensor did you replace and where did you get it?
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Old 10-11-2011, 01:46 PM
RedneckMechanic RedneckMechanic is offline
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Sounds like what my Ram was doing. Sometimes the potentiometer gets a dead spot in it from being in the same position all the time. Until I replaced it, before I started it, I'd floor floorboard the throttle a few times really quick to clean the crap off the contacts. Worked for a few drive cycles and then I'd have to do it again. But leaving it that way will eventually mess up your Torque Converter Clutch solenoid because the engine's bouncing through the RPM's.

Truckin - I'm not sure about the newer Rams, but on our 3rd Gens, if you look on the driver's side of the throttle body, you'll see a black sensor a little larger in diameter than a silver dollar, and about 3/4"-1" thick with, I think, a 3 wire plug. That's your TPS. Easy to swap out...
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Old 10-12-2011, 12:46 PM
Truckin Truckin is offline
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Ok, thank you for the info. Think I will call my dealer first and see if they know of a solution since it's under warranty.
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Old 10-13-2011, 09:51 PM
Guzoontite Guzoontite is offline
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Quote:
Originally Posted by Truckin View Post
I have an 2011 Ram that idle will drop to 500rpm then bounce up to 700 or so and I think I can feel a surge when I drive sometimes to. Is this something that I can take to the dealer to have replaced ie. faulty part and if not what sensor did you replace and where did you get it?
Truckin, it sounds like you are having the exact same issue I am having. I have a 2011 Ram 1500 with the 5.7L. About 50% of the time when I am driving and come to a stop, the idle will drop down to 500 rpm. The other half of the time, it will idle at the "normal" rpm (about 700 rpm). I can't seem to find any kind of a pattern why sometimes when I come to a stop it will idle at 500 and other times 700. But, I have noticed that the only times it drops down to 500 rpm is when I am driving and come to a stop. When it is idling at 500 rpm, if I shift into any other gear (ie. neutral, rev, park) it will immediately go back up to 700 rpm and stay there. The same thing happens if touch the gas paddle at all, it will idle back up to 700.

As a side note, when it is idling at 500 rpm, it is not running rough or anything. It is still running just as smooth as when it idles at 700 rpm. The only difference I notice is at 500 rpm there is a noticeable engine power drop. For example, when I am sitting still and I let off the brake, the truck will not move forward as quickly as when its idling at 700 rpm, and depending on the grade of the road it may not even roll forward at all.

Does this sound like the issue that you are having? Have you heard anything back from the dealer about it yet? Any help would be much appreciated. Thanks.
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  #7  
Old 10-15-2011, 08:13 PM
Truckin Truckin is offline
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Yup, that's exactly what mine does. Haven't had a chance to call the dealer yet.
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Old 10-16-2011, 10:35 PM
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hemiram21 hemiram21 is offline
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this is the same exact problem im having with my 2004 ram!!!! im dropping my truck off tomorrow to my local mechanic hoping to find out the problem!! because i cant stand it anymore!!
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Old 10-16-2011, 10:44 PM
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Rammin Rammin is offline
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You should just go buy the $30 part and try it first. I can walk you through it step by step if need be. If you can change a battery then you can change this plug.
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Old 10-16-2011, 11:14 PM
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what part is it?
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