why does it idle up but will not idle down.

2005 DODGE RAM
15,000 MILES
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TGANN
  • MEMBER
  • 3 POSTS
05 dodge 3500 5.9 diesel idle up but won't idle down. the only way it will idle down is to turn off engine and restart. installed new injectors but didn't help.
Sep 22, 2011 at 6:17 PM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Have you tried to check for trouble codes?
Sep 23, 2011 at 5:54 AM
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TGANN
  • MEMBER
  • 3 POSTS
I have checked it does not show any codes
Sep 23, 2011 at 6:29 PM
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TGANN
  • MEMBER
  • 3 POSTS
I have checked it does not show any trouble codes
Sep 23, 2011 at 6:30 PM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Since turning engine off and restarting changes the idling speed, it should be a control problem and without any trouble codes, you would need to plug in a scan tool to monitor the various sensors and check if they are working within specifications.
Sep 24, 2011 at 4:54 AM
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