1997 Jeep Wrangler loss of power, stumble

Tiny
GLXY66
  • MEMBER
  • 1997 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • MANUAL
  • 75,000 MILES
My 1997 Jeep Wrangler will occasionally loose power and stumble. This happens at any and all operating temperatures. Sometimes I can drive 100 miles between occurances. The engine never cuts off completely. I have 50# fuel pressure, NO check engine lite or trouble codes. When this happens the engine vacuum drops to 4 to 8" and it triggers the map sensor to richen the mixture and increase the injector dwell time and it run rich. This condition usually lasts approximately 2 to 3 minutes and goes away. I can watch a vacuum gauge connected to the intake and actually see the vacuum drop and them come back up. Where can an internal vacuum leak be?
Tuesday, July 29th, 2008 AT 3:31 PM

1 Reply

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Maybe the idle speed control motor is opening up droping vac as if throttle was opened wider.
Don't know what would cause that to happen it would need volt signal from PCM.
If you find out please post
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Tuesday, July 29th, 2008 AT 3:59 PM

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