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Old 01-07-2014, 04:27 PM   #1
SL19302
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Default -10 And having issues with high idle.

Hey guys,

Its -10 here and I have been having issues all day with high idle, The idle resets with shutting off the car but returns after about 2 miles, Should I ignore the issue being the temp is so cold out? I know the TPS is having an issue at these temps, I have not driven the other car yet to see if that one responds the same way, Ive been using the block heater all day to dry and dampen the blow on the engine but the car is really having issues all day with these temps. I was just going to let it alone being its this cold outside, Its the first time in years for these temperatures.

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Old 01-07-2014, 09:55 PM   #2
Saturn1986
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Default Re: -10 And having issues with high idle.

Probably normal with temps that low, ill let the other guys comment since they have been around these cars longer and know how they behave with winter temps.

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Old 01-07-2014, 10:43 PM   #3
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Default Re: -10 And having issues with high idle.

my guess could be that this could be normal. i think we already had at least 2 days of this low temperature and my wifes car was idling a little high both 2 days.

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Old 01-08-2014, 12:06 AM   #4
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Default Re: -10 And having issues with high idle.

If it resets when you switch the car off and back on it is the TPS, probably a flaky connection. Disconnect clean socket and connector with CRC QD-Electronics Connection Cleaner and very lightly grease the rubber connector seal, keep the grease out of the connector proper. That may or may not fix it but it is quick and cheap.

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Old 01-08-2014, 11:56 AM   #5
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Default Re: -10 And having issues with high idle.

Same issue going on here. Seems to be more frequent with the cold temps. I've just been waiting on a warmer day to pop the hood and investigate the TPS.

I've just been ignoring it though...not going to hurt much except the fuel economy.

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Old 01-08-2014, 01:00 PM   #6
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Default Re: -10 And having issues with high idle.

Quote:
Originally Posted by SL19302 View Post
Hey guys,

Its -10 here and I have been having issues all day with high idle, The idle resets with shutting off the car but returns after about 2 miles, Should I ignore the issue being the temp is so cold out? I know the TPS is having an issue at these temps, I have not driven the other car yet to see if that one responds the same way, Ive been using the block heater all day to dry and dampen the blow on the engine but the car is really having issues all day with these temps. I was just going to let it alone being its this cold outside, Its the first time in years for these temperatures.
EXACT same situation with the extra cold temps on my SL2.

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Old 01-08-2014, 01:21 PM   #7
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Default Re: -10 And having issues with high idle.

Well it is either the TPS or the connector. Cold will adversely impact either component. This is not normal expected behavior and should be fixed. First guess would be the connector is the cause. For warm weather troubleshooting get a couple cans of Freeze at a decent electronics supply shop, maybe even RadioShack will have it.

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Old 01-08-2014, 06:23 PM   #8
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Default Re: -10 And having issues with high idle.

Well ill see what happens when I use it tomorrow, I drove the other car today and that one did not act up at all, However we made it to +12 degrees today verses the -10 it was yesterday.

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Old 01-08-2014, 06:43 PM   #9
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Default Re: -10 And having issues with high idle.

Sounds like the TPS, as I had the same problem. It would idle fine for a bit and then start idling high out of no where. If I turned the car off and back on it would fix it but still return after so many miles. Cleaned it and that didn't help. Bought a new ACDelco TPS and installed it, and it's ran/idled fine since.

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Old 01-09-2014, 12:03 PM   #10
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Default Re: -10 And having issues with high idle.

For $30, it's worth replacing either way if the installed TPS is original.

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Old 01-09-2014, 01:13 PM   #11
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Default Re: -10 And having issues with high idle.

That AC Delco is not OEM. If you want OEM then you dig one out of the JY and be real careful as all/most of the aftermarket TPS have the correct Saturn part number on them.

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Old 01-09-2014, 01:44 PM   #12
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Default Re: -10 And having issues with high idle.

If aftermarket replacements have the Saturn number on them how can you tell the original from a aftermarket unit? I installed an AC Delco unit on my Wagon in the fall from my local GM Dealership, It had the Saturn P/N on it, It seems to work correctly and corrected the random high idle I had on that car a few months back.

...
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CHECK YOUR OIL!

Last edited by SL19302; 01-09-2014 at 01:50 PM..

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Old 01-09-2014, 03:20 PM   #13
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Default Re: -10 And having issues with high idle.

You tell the difference by comparing the level of gunk on the surrounding wiring, sensors, etc to the TPS. The TPS is not a linear or log potentiometer there is a specific curve( ohms vs. degree of rotation ) in them. Having a generic TPS on a manual trans car may never be noticed but part of the auto trans shifting is done by throttle position. This little issue was covered some time in the past along with a discussion on the impact the MAP sensor has on mileage. poster bendorfold enter into search box above.

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Old 01-09-2014, 04:39 PM   #14
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Default Re: -10 And having issues with high idle.

Ive been through 4 TPS (tried both used & new) and fully replaced the TPS connector with delco new. Occasionally and randomly my car still likes to idle high. I'm convinced there is no solution.

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Old 01-09-2014, 05:30 PM   #15
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Default Re: -10 And having issues with high idle.

Well I drove it all around today and it didnt act up one time, Its 25 degrees though, Ill see what happens the next cold snap, I didnt reseat the connector at all yet, I wanted to see what happened when the temp rebounded, So far its good, A guy that I work with his 2013 Corolla was acting up that day when it was -10 so I think that bitter cold with the wind chill near -25 had alot to do with what was going on with alot of peoples cars.

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Old 01-09-2014, 05:42 PM   #16
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Default Re: -10 And having issues with high idle.

Yeah, I actually grabbed it because it matched the OEM serial number but did not know that.

Either way it seems to work fine and I installed it ~8 months ago. It fixed my high idle and car runs pretty good. I changed my valve body and it helped a lot but there it still changes kinda rough sometimes. But with almost 200,000 miles on the transmission, and the fact I've gave it a little hell, I'm convinced it's the transmission and not the TPS.

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Old 01-09-2014, 10:02 PM   #17
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Default Re: -10 And having issues with high idle.

Quote:
Originally Posted by SL19302 View Post
If aftermarket replacements have the Saturn number on them how can you tell the original from a aftermarket unit? I installed an AC Delco unit on my Wagon in the fall from my local GM Dealership, It had the Saturn P/N on it, It seems to work correctly and corrected the random high idle I had on that car a few months back.
If it corrected the problem, you have a winner. I really don't see the logic in sourcing JY parts when the majority of the cars are higher miles when they are scrapped. If I had a local JY full of 25K mile cars, sure I would snatch up some spare parts on the cheap. But when half the cars in the yards have more miles than my car, it really makes no sense to replace a worn out part with another worn out part.

My oil isn't OEM either, and I'm not scared.

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Old 01-09-2014, 10:43 PM   #18
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Default Re: -10 And having issues with high idle.

Quote:
Originally Posted by SL19302 View Post
Well I drove it all around today and it didnt act up one time, Its 25 degrees though, Ill see what happens the next cold snap, I didnt reseat the connector at all yet, I wanted to see what happened when the temp rebounded, So far its good, A guy that I work with his 2013 Corolla was acting up that day when it was -10 so I think that bitter cold with the wind chill near -25 had alot to do with what was going on with alot of peoples cars.
Cold does that to variable resistors and those connectors. It is not an uncommon problem.

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Old 01-10-2014, 12:56 AM   #19
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Default Re: -10 And having issues with high idle.

I'll throw another possibility into the hat for good measure, however I think this would be less likely than what has already been mentioned. Gunk in the throttle gets stiffer at -10, causing throttle to stick, unlikely but a possibility if the throttle body has not been cleaned in forever.

As discussed, more likely a component level failure of the potentiometer in the TPS at that happens at that temperature causing the incorrect resistance value to be displayed to the PCM, but otherwise fine at above 0 temps.

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Old 01-10-2014, 09:32 AM   #20
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Default Re: -10 And having issues with high idle.

I cleaned my throttlebody in September, and one time 2 years ago which it was really gunked up at 80K that was the first time it was cleaned, So thats not an issue, Its been cleaned twice in 8K miles, but I could see that being a possibility on a dirty throttlebody.

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