Mechanics

I HAVE A 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?

2001 Subaru Outback • 105,000 miles

Seems to do it mainly when warmed up.
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SHEVA
October 24, 2011.



http://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.

Rasmataz
Oct 26, 2011.