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98 SL2 HIGH IDLE

Tiny
SATURNMAN63
  • MEMBER
  • 1998 ALL OTHER MAKES ALL OTHER MODELS
HI I HAVE A 98 SL2 TWIN CAM, 44,000 MILES. IT REVS AT 2000 OR SO RPM. IT WAS AT 3000 UNTIL I CHANGED TPS SENSOR. I HAVE A CODE THAT READS 1509 BUT I CANT SEEM TO FIND WHAT THAT IS. ANY SUGESSTIONS?
Monday, January 22nd, 2007 AT 9:34 PM

1 Reply

Tiny
PEPPERMRJ
  • MECHANIC
  • 1,158 POSTS
DTC P1509 Idle Speed High - Idle Air Control (IAC) System Not Responding

The first thing to look for is the ECTS. They will fail and cause a high idle also. The plastic tip cracks. Replace it with an updated brass tipped sensor from saturn.

Check the IAC wiring. Make sure the connection is clean and tight. Sometimes they will get carboned up and can be cleaned along with the throttle body.

Good luck and let us know. :)
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Wednesday, February 7th, 2007 AT 5:35 PM

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