[2005 Subaru Impreza RS Shudder]

Fairtax. I drove my vehicle in today and cleared the CEL after I got to work. The idle didn't dip down like it has been. ECU adjustment?

[2005 Subaru Impreza RS Shudder]

That website does not resolve for me. Typo?

 

Worked the 2nd try.

[2005 Subaru Impreza RS Shudder]

P0506 Idle air control system, Rpm lower than expected.

This code means there is a vacuum leak or other problem causing a low idle speed condition for which the IAC valve is not able to adjust far enough to correct.

This could be because of a faulty IAC motor, or the valve for the IAC is clogged.

Since this code occurred after changing spark plugs you should inspect the hoses for the breather system that attach to the intake piping. There should be one from each valve cover and one that attaches to a Y next to the hose from the PCV valve. The PCV valve should be next to the throttle body on the passenger (right hand) side of the intake manifold.

Also check all of the small vacuum hoses that attach to the intake manifold. You may have one that is broken or split, which could be causing the shuddering issue. There are a few that loop under the intake manifold on each side of the engine that go to solenoids for the EGR and Evap systems.

 

I would also recommend removing the IAC valve and cleaning it as well as the ports in the manifold. While you're at it, clean the bore of the throttle body as well as the back side and edges of the throttle plate. I just use a rag soaked in Throttle body and Air intake cleaner (Can be bought at any auto parts store) to wipe the crud off. Spray the cleaner into the IAC and let it soak for a minute or so to help dissolve the crud in there.

 

Thanks for the information. I am not the greatest mechanic in the world as I am still learning. What does the IAC look like? 

 

I have been trying to find a blow out view of the engine and its parts and not having much luck with that.

 

Edit; Information I am seeing is that my 2005+ car doesn't have an IAC....is this the case?

[2005 Subaru Impreza RS Shudder]

1.) About 165k. Automatic Transmission

2.) Yes. The shuddering and hard shifting it what prompted me to look into a replacement.

4.) I believe I feel it more often after the car is warmed up and driving around

 

3.) Side note to all this fun stuff. I replaced the spark plugs on monday and now the car is idling abnormally low. On my way into work today the CEL came on with code P0506. This car is driving me nuts!

 

Thanks for any information you can provide.

[2005 Subaru Impreza RS Shudder]

Hello Gents!

 

I have having some issues with my 2005 Impreza RS. When I slow down I sometimes feel a shudder in the vehicle. It also sometimes shifts pretty hard between gears.

 

When the hard shifting started I looked into and replaced the transmission with one that had 27k miles on it. No change in the problem.

 

Thoughts?