The 2006 Outback rumbles and roars sitting at intersections while in gear, slip it into neutral and is smooth. On older cars there was a switch or something that would fix such a problem and was wondering if there was such a thing on the Outback. Any ideas, or educated guesses? Thanks.

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automatic?

 

 

people report vibration from front axles (usually poorly rebuilt units) when in gear.

 

I suppose it could also be some resonance from loose heatshields.

 

 

never heard either referred to as a 'roar' however.

 

 

 

Do you hear it under the hood when idling?

Edited September 1, 201213 yr by 1 Lucky Texan

Yes automatic, acts as if it wants to drive away instead of staying put.

Yes automatic, acts as if it wants to drive away instead of staying put.

 

 

any work,wrecks repairs or mods done right before this began?

 

are you saying it's surging? what are the rpms on the tach like when this happens?

 

is the CEL on? any other symptoms while driving?

What's the idle speed? Should be around 750 rpm. Does idle speed move up and down?

 

On older cars that "switch" was probably the AC on/off button. AC puts a lot of drag on the engine. Older cars didn't usually have a step up setting to increase idle speed when the AC turned on. Newer cars do and it's controlled in such a way that it masks the drag of the AC pretty well. 4 cylinder cars have the most noticeable change in idle speed when the AC turns on due to the lack of inertia in the crankshaft.

 

Try turning the AC off when it's doing this and see if it has any effect.

RPM right at 750 once it's warmed up according to the dash. No wrecks, had the CV shaft under the cat replaced and a Bosch O2 sensor.

Replacement cv shaft? Was an OEM replacement or parts store aftermarket junk? I don't mean junk lightly. Most parts store axles are just that, absolute JUNK. Rebooting the original axles, even if they are clicking and making all kinds of noise, the old split boot OE axles are 110 times better than aftermarket rebuilt axles.

Master Pro Select 100% new is what the box says, but it also says Made in China so most likely junk. I'm not to up on CV joints, am more into old swing axle reduction box systems like in my 60 VW truck. Why would a CV joint rattle things about if the car is not moving?

The theory is that it has something to do with the clearances in the bearing cups being to large.

It's a well documented issue that these cars suffer from. Do some research on the various Subaru forums (or google it), there are TONS of threads out there of automatic transmission Subarus with symptoms of shaking, vibration, and noise immediately after replacing a front axle with an aftermarket part, and changing the axle with a quality part solved the problem.

Where does one find good quality parts? We live in the sticks and not much selection around here.

I've heard people say they've had good luck with Napa axles. EMPI is another brand that gets recommended fairly often.

You could also order a rebuilt axle from MWE in Denver. He rebuilds only Subaru axles and sells new axles as well.

http://www.ccrengines.com/mwe/