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Old 10-08-2010, 10:14 PM   #1
munky000527
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Default Problem with throttle body position sensor?

I've been having a problem with my 2004 Ion auto for a month now. It feels as if I'm constantly holding down the accelerator pedal, but just slightly.

I have an Ultra-Gauge, and it shows that the throttle position stays at either 0 or 0.78, even when my foot is completely off the pedal. It never shows anything else, it just shows either 0 or 0.78, and it changes between the two. Sometimes it will just stay at 0.78.

This really sucks because my car will not downshift (it never hits idle) unless I'm braking. It's killing my MPG and I'm afraid it's killing my car.

Is this a problem with the sensor, and how should I fix this?

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Old 10-09-2010, 02:27 AM   #2
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Default Re: Problem with throttle body position sensor?

You need a new tps, you can try cleaning the old one with electrical cleaner, but you most likely just need a new one

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Old 10-11-2010, 11:30 PM   #3
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Default Re: Problem with throttle body position sensor?

Quote:
Originally Posted by 2006 ion2 View Post
You need a new tps, you can try cleaning the old one with electrical cleaner, but you most likely just need a new one
Could the problem be with the "acceleration cable" on the pulley on the side of the engine? Sorry I don't know the proper terminology but I messed around with it wondering what it was when I changed the oil a couple weeks ago.

The problem seems like it's slowly going away...

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Old 10-12-2010, 12:06 AM   #4
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Default Re: Problem with throttle body position sensor?

You would know if the throttle cable was sticking, this sounds like a tps.

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Old 10-13-2010, 01:43 PM   #5
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Default Re: Problem with throttle body position sensor?

Okay thanks for the information. Is there some place where I could find diagrams for my car? I'm having trouble finding where certain parts of the car are. (transmission drain and fill bolt, tps and throttle body)

Sorry, I'm a noob to cars.

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Old 10-13-2010, 02:58 PM   #6
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Default Re: Problem with throttle body position sensor?

The throttle body is the thing that is attached to the cable that is attached to the vroom vroom pedal, the transmission might not be user serviceable (do you have a sedan or coupe?), you might want to buy a chilton manual.

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Old 10-14-2010, 09:31 AM   #7
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Default Re: Problem with throttle body position sensor?

Been meaning to check/clean my throttle body for some time now...

Just needed to take the time to find it. I'll check the vroom vroom cable and see where it leads me. I've also heard it's between the Air filter housing and engine... So hopefully it won't be too hard to locate. Might even have to take pics (and attempt to post them to the HELL that is the saturnfans photo gallery.)

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Old 10-14-2010, 08:31 PM   #8
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Default Re: Problem with throttle body position sensor?

Quote:
Originally Posted by 2006 ion2 View Post
The throttle body is the thing that is attached to the cable that is attached to the vroom vroom pedal, the transmission might not be user serviceable (do you have a sedan or coupe?), you might want to buy a chilton manual.
I have a Sedan. I'm looking into buying some kind of manual but I don't really know what to look for. Is a Haynes manual the same as a Chilton?



Quote:
Originally Posted by lgodave View Post
Might even have to take pics (and attempt to post them to the HELL that is the saturnfans photo gallery.)
If you made a short how-to with some pictures that would be awesome. I'm having a tough time learning about how this car works just by reading.

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Old 10-14-2010, 09:12 PM   #9
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Default Re: Problem with throttle body position sensor?

I've had/used the Haynes manual for my previous vehicles... (Not the ION) I found them inexpensive and useful.

It is helpful but you might find the Chilton more in-depth. I guess it depends on what you need/want to do with it.

My local Library carry various Car Repair manuals from Chilton,Haynes, and others... You might check your local Libraries and compare them (even if they don't have an ION manual... maybe try a previous car or truck you're familiar with... the general layouts can be similar).

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Old 10-14-2010, 09:49 PM   #10
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Default Re: Problem with throttle body position sensor?

Haynes is chilton, this topic has been discussed in detail on here before, If you do a search

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Old 01-14-2011, 11:25 AM   #11
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Default Re: Problem with throttle body position sensor?

munky000527, have you replaced your Throttle Position Sensor yet? If so, did it correct the high idle problem? I've recently been experiencing the exact same symptoms on my '04 auto...

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Old 01-15-2011, 06:59 PM   #12
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Default

Quote:
Originally Posted by Tubagod767 View Post
munky000527, have you replaced your Throttle Position Sensor yet? If so, did it correct the high idle problem?
I actually just removed the throttle body and cleaned it with MAF cleaner. Put it back and the problem was almost gone, but my TPS still read .78 some if the time. Took it back out and cleaned it again, problem disappeared.

I would definitely try cleaning the throttle body, TPS, IAC, and MAP sensors. Theyre all in the same general area.

Make sure you dont clean the throttle body while its on the engine. Take it off first. Focus on the small ridge that stops the butterfly. That was where the problem was for me. Carbon deposits were holding the butterfly open ever so slightly, making the TPS read 0.78 when idling. Sometimes it even read 1.18 or 1.9.

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Old 01-21-2011, 11:26 AM   #13
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Default Re: Problem with throttle body position sensor?

I've cleaned the throttle body and IAC valve hole to no avail. I finally broke down and purchased a TPS sensor. After replacing the TPS the high idle issue has been solved. The only problem I had was finding the part, even GM dealers (saturn certified) didn't carry it. The sensor was obviously the faulty part, but it was not setting off the CEL.

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Old 01-21-2011, 11:33 AM   #14
2006 ion2
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Default Re: Problem with throttle body position sensor?

weird. that sensor typically sets a CEL on GMs. glad you have it fixed, though.

...
2007 Saturn Ion 2
2003 Chevrolet venture lt

trifecta dealer for the U.P. and WI. There is no two door ion. Proudly driving one of the last saturns produced before gm killed the brand.

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Old 01-21-2011, 11:59 AM   #15
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Default Re: Problem with throttle body position sensor?

My suspicion is that the sensor was still emitting voltages between the proper range (which wont set off the CEL) but not accurately for the position of the throttle. The ECU was getting the trigger to provide more fuel even on a closed throttle position. I did a lot of research and came to the conclusion that my symptoms matched that of either a faulty TPS or a bad ECU...so tried the cheaper fix and got lucky. Upon my searches I did discover other people needing to replace the TPS without a CEL. My symptoms included...

High Idle (1500 rpm while on the brake, 2500-3000 rpm in neutral or park)
Lack of acceleration and power
Engine hesitation
random acceleration without pushing down the pedal
After the vehicle warmed up, turn off the vehicle and then turn it back on the high idle would subside and return back to 600-700 rpm then become intermittent while driving.
Significant loss of gas mileage

I tried unhooking the battery and resetting the ECU but that did not solve the issue.

I think there was a mechanical issue within the TPS so that when the vehicle was cold, the metal contacts were not making proper contact. Either way, I hope this helps some other people if they're experiencing similar issues.

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Old 01-21-2011, 12:24 PM   #16
2006 ion2
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Default Re: Problem with throttle body position sensor?

unplugging the battery doesn't solve problems, it simply resets the ecu.

...
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2003 Chevrolet venture lt

trifecta dealer for the U.P. and WI. There is no two door ion. Proudly driving one of the last saturns produced before gm killed the brand.

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