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2003 Saturn L300 Won't idle down

Tiny
CLEMONS
  • MEMBER
  • 2003 SATURN L300
  • 3.0L
  • V6
  • FWD
  • AUTOMATIC
  • 161,616 MILES
I have a 03 Saturn L300 just replaced the ECM. Completed the relearn for it but it won't idle below 3500RPM.
I have replaced throttle body and accelerator petal and tried to relearn them but same problem. The only code I have is PO1780. Any suggestions?
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Friday, September 11th, 2015 AT 11:14 AM

2 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So is the throttle plate open its idling that high?If not you have a big vacuum leak somewhere.
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Friday, September 11th, 2015 AT 12:28 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Also how did you learn the ecm and the new throttle body? Also your sure you only have the code p1780?
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Friday, September 11th, 2015 AT 12:33 PM

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