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Erratic idle in park high idle in drive

Tiny
THANVAS
  • MEMBER
  • 1993 HONDA ACCORD
  • 214,000 MILES
My car is idling from 2500 rpm to 1500 rpm at park. When I put it in drive the rpm is at 1500 rpm and does get any lower. I have tried to troubleshoot it by disconnecting the vacuum hose going to the map sensor and the erratic idling stops. I've also notice that if I disconnect the idle sensor the erratic idle stops. I have tried changing out the vacuum control box, switch egr valve, fast idle sensor, cleaning the and tighten the intake air control valve and nothing seems to be working.
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Sunday, May 5th, 2013 AT 3:18 PM

1 Reply

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
MAYBE YOU HAVE A VACUUM LEAK ?

IT MIGHT BE SOMETHING OBVIOUS YOU CAN SEE AND POSSIBLY HEAR HISSING........AND REPAIR.....LIKE A CRACKED HOSE, OR ONE PULLED LOOSE

http://www.youtube.com/watch?v=9CPqbaSgcok

INSURE IF YOU DO HIS METHODS, DO 'EM OUTSIDE AND WITH A FIRE EXTINGUISHER HANDY

THERE MAY BE OTHER POSSIBILITIES.......IS YOUR CHECK ENGINE LIGHT ON?

KEEP US POSTED

THE MEDIC
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Sunday, May 5th, 2013 AT 3:28 PM

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