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Engine seems to stumble mainly when warmed up

Tiny
SHEVA
  • MEMBER
  • 2001 SUBARU OUTBACK
  • 105,000 MILES
I have a 2001 Subaru Outback 2.5 and when the a/c engages the engine stumbles and almost cuts off. It feels like it is losing all power for a second or so then idle fluctuates and smooths out. Any ideas?
Monday, October 24th, 2011 AT 2:08 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
https://www.2carpros.com/articles/engine-hesitates

Could be caused by one of the following below

Oxygen sensor.

Catalytic converter.

Fuel injectors dirty/sticking.

Mass airflow sensor/Airflow meter.

Throttle position sensor.

Crankshaft position sensor

Knock sensor

Manifold absolute pressure sensor.

EGR Valve

Fuel pressure regulator leaking or defective fuel pump.

Fuel contamination.

Foul/defective spark plugs.

Open spark plug wires.

Ignition coil/Coil packs defective.

Incorrect ignition timing.

Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.
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Wednesday, October 26th, 2011 AT 4:08 AM

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