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Automotive/Subaru rough idle when cold
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Question
I just bought it 2004 Outback - 4 cyl. When the engine is stone cold it rough idles - bad. The RPM's go up to 2k then down to 1.5k then up then down to 1k. It almost wants to stall. It lasts about a minute. I think till it goes into closed loop then it's fine for a boxer style engine. It's got 40k on it and I live in CT. Any info is greatly appeciated. Thanks
The cause for rough idle can be ,,vacuum leak.MAF sensor,idle air control,throttle position sensor,intake manifold leak,EGR valve sticking, so if you check all these you may be able to find the fault.If you just bought the car im assuming you didnt get warranty?
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Answers by Expert:
Sean Halliday
Expertise
general auto repair,japanese,bmw,mercedes,mini cooper 1960/2009,general british cars,ford.I DO NOT work on automatic transmissions.Manual transissions i install clutches only.Many people ask me to diagnose noises from their cars,unfortunately i cannot do this unless i hear it.As you appreciate,vehicles can and will make a variety of noises.I DONT UPGRADE or fit aftermarket performace kits,parts,chips,only replacement parts.
Experience
40 years experience on all general auto repair.
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