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Old 04-11-2008, 09:45 PM   #1
Baxter
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Default 03 Saturn Vue throttle problems?

I just bought a 2003 Vue from Carmax: 2.2l 4cyl 5-speed manual. It needed some work before I got it (valve replacement I think, code was P0302 cylinder misfire). Now it is reporting P1516 and sometimes P1515 (throttle position related), and it is enforcing the Reduced Power mode. It drives well enough to limp in to the dealer for my Monday appointment but that's it. I don't really know what I'm doing diagnosis-wise, but I know a couple of things:

1. Throttle plate opens fine by hand, and springs back closed when released.
2. My OBDII scanner (ScanGauge II) reports a change in throttle position when I move the throttle plate by hand.
3. The scanner does not report a change in throttle position when the accelerator is pressed, whether the engine is running or not.
4. Throttle plate flutters quickly a few times when the engine is started.
5. The voltage on some wire connected to the top of the throttle changes in the 3-5 volt range relative to ground when the accelerator pedal is pressed.
6. Idle is very rough.
7. This all began when I stalled the car right after starting it by being careless with the clutch. Twice in a row. After that it wouldn't start at all until the next morning, when the trouble codes started appearing.

I couldn't find any TSBs that seemed relevant, not that I know where to look or how to tell if they're relevant.

I am wondering if I need to back out of this deal (two major mechanical problems in two weeks?). Any thoughts on whether this car will be fine once this is repaired, or am I doomed to repeated service visits if I keep this thing? I should still have a day or two to back out under Carmax's refund policy. But I like the car...

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Old 04-13-2008, 03:24 AM   #2
TheFonz
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Default Re: 03 Saturn Vue throttle problems?

these dtcs are for thottle position correlation i believe...?? if you just bought the car from car max bring it back to them and tell them to fix it. From what your describing is that you have a bad throttle body or throttle actuator controller.. The 2 tps sensors inside read eachother and if they differ for a few seconds or milliseconds then you get a ses lamp with reduced power. Some need a new connector and wiring to the throttle actuator.. GL

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Old 04-13-2008, 05:58 PM   #3
VTchemist
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2003 VUE 3.0L
Default Re: 03 Saturn Vue throttle problems?

I had the throttle body cleaned after 50K miles. It wasn't throwing any codes, but the overall "smoothness" in acceleration was better.

CarMax should do this for you. If not, ask them to find you another.

And BTW, beware of the VTI automatic transmissions that are on the 02, 03, (and 05?) VUEs.

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Old 04-13-2008, 06:55 PM   #4
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Default Re: 03 Saturn Vue throttle problems?

Thanks, y'all. It's going to carmax tomorrow. Manual transmission, by the way; I have indeed avoided the VTI. :)

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