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High idle?

Tiny
98 STAURN
  • MEMBER
  • 1998 SATURN SL1
  • 135,000 MILES
Soo would the coolant temp sensor if bad throw the throttle postion sensor code if it bad or is that that sensor cause ive been reading alot on these cars with high idles and most are the coolant temp sensor just wonder cause I picked this car up pretty cheap cause of the high idle
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Monday, October 28th, 2013 AT 8:13 PM

20 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
A bad coolant temp sensor can cause a code P0711 but not a tps code. What is the exact code number you have not code descriptions? Also can your scan tool read live data like the tips sensor?
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Monday, October 28th, 2013 AT 8:24 PM
Tiny
98 STAURN
  • MEMBER
  • 3 POSTS
I took it to auto zone and the tps was the first that popped up but I didnt kno if that would cause idle a 2000 all time
times
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Monday, October 28th, 2013 AT 8:35 PM
Tiny
SATURNTECH9
  • MECHANIC
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It can cause high idle and hard shifting it could be the wires I really doubt its the sensor itself.I have seen very few go bad in all the years I have worked for Saturn.
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Monday, October 28th, 2013 AT 9:07 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The exact code number would really help.
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Monday, October 28th, 2013 AT 9:08 PM
Tiny
98 STAURN
  • MEMBER
  • 3 POSTS
Well its a manual trans ive just been reading alot on these forums about the coolant temp sensor making a high idle but didnt kno cause the tps code was the first code thrown at autozone
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Monday, October 28th, 2013 AT 9:13 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The tips miss reading can cause a high idle the best way to diagnosed it is get a scan tool that can read live data like tps etc There like 50 or so on amazon. Or take it to a shop to diagnose. Your going to need tools like a multi meter scan tool that can read live data etc to diagnose it.
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Monday, October 28th, 2013 AT 9:40 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
Catalytic converter also "plugged up" as well can cause high rev upon cold start-up. Also the CTS will cause the fan NOT to work. Any replies to this helpful. Thanks. Wink - DTM
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Monday, June 5th, 2017 AT 2:41 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I have never seen a plugged cat cause a high idle on cold start on Those cars.I have seen a lot plugged cats on Those cars. If the cat was plugged the most notable thing would be the lack of power.
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Wednesday, June 7th, 2017 AT 1:07 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
Sorry I mis-understood. Actually the engine starts WELL when COLD but when HOT its a bit more tempermental plus the cat code shows up (service engine soon light) as well first one to show up then CTS. No TPS code showed up. Thanks. DTM
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Wednesday, June 7th, 2017 AT 1:18 PM
Tiny
SATURNTECH9
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Ok if your asking a question then you need to start your own question with as many details as possible exact code numbers not code descriptions etc.I would be more then happy to help you out with that.
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Wednesday, June 7th, 2017 AT 1:21 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
Apologies.I figured out THE problem. Thanks. CAT is PLUGGED.
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Wednesday, June 7th, 2017 AT 1:29 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
That's ok thank you for using 2carpros
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Wednesday, June 7th, 2017 AT 1:30 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
You are welcome and NO. THANK YOU for this site. THIS IS what the internet is intended to be used for. Wish we could solve all our nations problems by Googling. Lol.
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Wednesday, June 7th, 2017 AT 1:33 PM
Tiny
SATURNTECH9
  • MECHANIC
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Please tell all your friends about our site iam the factory trained saturn tech on this site. If you have a question just start the question by saying this one is for Saturntech9.
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Wednesday, June 7th, 2017 AT 1:35 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
Okay Kewl man, sounds awesome. I will say that my girlfriends car (98) has over 200K on it. Ugh. Needs some tlc indeed.
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Wednesday, June 7th, 2017 AT 2:01 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
My 1999 saturn sl2 has 338,000 miles on it.
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Wednesday, June 7th, 2017 AT 6:13 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
Wow. Unreal.
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Wednesday, June 7th, 2017 AT 6:30 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
Hers has "blow-by" really bad meaning with engine running, take oil cap off it just "blows"/ejects HOT air out of the oil cap hole, plus the pcv valve just rattles like a rattlesnake tail on top middle of the engine. Thats NOT good.
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Wednesday, June 7th, 2017 AT 6:37 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Yep, I would remove all of the spark plugs and do a compression test to see which cylinder is causing the problem.

Here is a guide.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run this test and get back to us so we can continue helping you.

Cheers, Ken
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Saturday, June 10th, 2017 AT 10:52 AM
Tiny
SATURNTECH9
  • MECHANIC
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When the saturn engines do that you have excessive blow by my engine did that till I put a short block in my car and had the head rebuilt. Its really common on Those engines the blow by can her pretty bad.
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Saturday, June 10th, 2017 AT 11:55 AM

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