Bp5 rough idle

[94bg5]

Hi all

I just bought a 2005 bp5 legacy gt, its idling rough like a cylinder's misfiring, also rough when cruising at a constant speed,  and seems to be running fine under acceleration. I've replaced air filter, air flow meter,  spark plugs and coils,  as well as putting an injector cleaner through. I've seen a few threads online of people with similar problems but no fixes that have worked for me. 

Does anybody know anything else I should be checking/replacing

Thanks in advance 

[GorGasmSpecB]

Check the AVCS solenoids for broken down filters.  Bits of the filters get jammed in the solenoid and cause rough running.  Mine had a piece of filter stuck in the solenoid.

 

Basically like this:

https://www.google.co.nz/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=0ahUKEwiojqrA-d7RAhWKvLwKHSPuDK0QFggYMAA&url=http%3A%2F%2Fforum.liberty.asn.au%2Fviewtopic.php%3Ff%3D10%26t%3D30105&usg=AFQjCNGHoavhXsmc4JsmW5UuZk_kGf8yPw&sig2=0N5f4oneABHV8UgmiPD9hQ

[Decap]

On 24/01/2017 at 5:51 PM, 94bg5 said:

Hi all

I just bought a 2005 bp5 legacy gt, its idling rough like a cylinder's misfiring, also rough when cruising at a constant speed,  and seems to be running fine under acceleration. I've replaced air filter, air flow meter,  spark plugs and coils,  as well as putting an injector cleaner through. I've seen a few threads online of people with similar problems but no fixes that have worked for me. 

Does anybody know anything else I should be checking/replacing

Thanks in advance 

Check for vacuum leaks. I installed an SSQV BPV the other day and forgot to reattach one of the vacuum hoses and the car was doing exactly what you've described to me.

 

http://legacygt.com/forums/showthread.php/intake-vacuum-leaks-and-you-pics-inside-235626.html

 

This will definitely be an easier first place to check before looking at the AVCS solenoids