Question about 2002 Mitsubishi Montero Sport

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Mitsu Montero Sport '02 engine stalls but not when air cond is on.

I cleaned the battery and made sure cables are tight. Montero sport ' 02 engine stalls when not pressing gas pedal. But when air conditioner is on the engine idles okay. I turn off air conditioner, then engine stalls. Weird. Help.

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Hi there. the reason that the engine idles good when the air-con is engaged is that ussually all vehicles nowadays have a vacumm advance mechanism. this is triggered mainly by a electric solenoid valve which is also attached parallel to the source supplying power to compressor. a small vacumm hose with a diameter like a common pencil or ballpen case. its made of rubber and it runs from the alternator vacumm pump then to the solenoid valve and to the vacumm advancer unit attached to the injection pump throttle. this system raises the idle a tad higher.

if your montero runs completely normal and you experience no other problems with your engine except for your present problem, then the solution is just raising the idle a little higher. if your montero is equiped with a RPM guage on the dash, try adjusting the idle to around 800 rpms. it would be healthier for your car if the idle raises a bit when you engage the air-con because this would compensate for the added load on your engine.

hope this helps.

Posted on May 31, 2009

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