2000 Saturn SL2 High Idle Speed

SATURN
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SGTKEVINBROWN
  • MEMBER
  • 1 POST
2000
Saturn
SL2
1.9 L4
5 speed manual

-At first start up Idle is above 2500 for over 5 mins.
-If you are sitting on a hill and just allow it to roll rpm go from 900 to 1700
-when shifting rpm don't drop unless you wait for aprox 15 seconds then drop to 1500 to 1700 only
-engin speed does not go below 1500 unless car is stoped for a 30 seconds to 1 min.
-checked codes and found none
-have auto xray diagnistic tool and viewed real time data and found no problems with TPS
-can not find a price for fuel pressure regulator anywhere does it have one?
-thinking Idle Air Control Valve
am i right?
this is a repair i am doing for a church at no cost need to try to spend as little as possable can you help?
Jan 25, 2007 at 7:58 AM
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SERVICE WRITER
  • ✓Experienced Mechanic
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IAC i very possible. EGRs are a sore spot with these cars too. Clean em both.
Jan 25, 2007 at 10:03 AM
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PEPPERMRJ
  • ✓Experienced Mechanic
  • 1,158 POSTS
Coolant temp sensors are known problems and will cause high idles/ Easy and cheap fix. Get the updated brass tip design from saturn. Also check the wiring plug for corrosion. Clean or replace it also.

Good luck and let us know. :)
Feb 7, 2007 at 11:03 AM
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SERVICE WRITER
  • ✓Experienced Mechanic
  • 9,123 POSTS
[quote:e20693b93a="peppermrj"]Coolant temp sensors are known problems and will cause high idles/ Easy and cheap fix. Get the updated brass tip design from saturn. Also check the wiring plug for corrosion. Clean or replace it also.

Good luck and let us know. :)[/quote:e20693b93a]

Geez...I should have known better...I'm with you on that Peppermrj!
Feb 7, 2007 at 12:07 PM

Suggested Repair

Replace the coolant temperature sensor with the updated brass-tip Saturn design and inspect or clean the wiring connector for corrosion. Also clean the idle air control valve and EGR valve, which can contribute to high idle on these cars.

Conversation Summary

A 2000 Saturn SL2 with a 1.9L and manual transmission idles above 2500 rpm for several minutes after startup and stays high while rolling or shifting, dropping only after the car is stopped. No codes were found and live data showed no TPS problem. Experts said a faulty coolant temperature sensor is a common, inexpensive cause and recommended the updated brass-tip sensor plus a corrosion check of the connector. They also suggested cleaning the IAC and EGR valves.

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