1991 Toyota Celica Rough Idle

Tiny
GORDON B. DALL
  • MEMBER
  • 1991 TOYOTA CELICA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 155,000 MILES
This car has a rough idle. If I jump the service electrical connector TE1 to E1 the motor runs great. As soon as I disconnect the jumper it idles rough again.?
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Monday, November 3rd, 2008 AT 10:28 PM

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Tiny
MMPRINCE4000
  • EXPERT
When you jump the connectors the IAC goes to the fully closed position, It also removes all computer advance so you can set mechanical timing, so I would take the IAC off and clean it and the TB port. That should help fix the idle.
Also look for any vacuum lines that are suspect, cracked/torn.

NOTE: Do not remove the IAC with ign. On or diagnostic terminals jumped.
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Tuesday, November 4th, 2008 AT 7:33 AM

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