Idle air control valve? where its location, code p0506 Limp mode

This code is becasue the throttle actuator is dirty and needs to be cleaned here is a guide that will help

https://www.2carpros.com/articles/reduced-power-limp-mode

This car does not have a IAC valve it is drive by wire and has a throttle actuator here is a guide to explain.

https://www.2carpros.com/articles/how-a-throttle-body-works

Roy

Thank you for this post I was able to fix my car for almost nothing. I love this site.

where is my idle air control valve located on my 04 trailblazer?

Check the throttle actuator control motor located on the throttle body nothing on the IACV

Where is located the idle air control valve, thanks

This car does not have a IAC valve it is drive by wire and has a throttle actuator here is a guide to explain.

https://www.2carpros.com/articles/how-a-throttle-body-works

Roy

I’m having the same issue. Rough idle. Replaced all plugs and coils. Cleaned the throttle body. Did all the things I’ve seen on this thread and nothing has worked. Could it be the cat converter or O2 sensor?

No to either. If you still have rough running, I would start by doing a compression test.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy

So a clogged cat wouldn’t cause it to run rough? I trust your input 100% and will try the compression test. Just trying to have all options on the table if that’s not the cause

I understand.

Keep me updated.

Roy

Will do. Thanks

You are welcome.

always glad to help.

Roy

Compression is good. What else should I look for? At this point I’m kinda at a loss on what it could be. It’s actually running worse now that I changed the plugs and coils. I read the plug gap is suppose to be 0.40. That’s what I set them at. Unless that’s wrong idk what else could be causing it to run worse now. The old plugs were set at that as well so not sure that’s the problem.

What was the compression on all the cylinders?

Roy

Sorry for late reply. They were all around 150

The computer says there’s a misfire in cylinder 4. I figured that would be the one that had lower compression. I started out just changing that coil pack. But that didn’t help so I changed all of them as well as plugs.

I would look for vacuum leak, check the plugs and coils as well.

Are there any other codes stored?

Roy

Did you respond? I got an email but nothing came through.

Roy