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I have a 99 civic ex and I have exactly the same problem ,maybe you read my post
So I already try cleaning the iacv and nothing then I replace it with a working one and nothing so I don't think is...

I have a 99 civic ex manual , when I turn on my ac my car's rpm drops almost to 0 and if I press accelerator whit the ac on the car reduces and accelerates the speed by it sef .someone tee me that...

(Air Conditioning Signal---) where is this??

Where is the ECM located and how do I clean the Idle Air Control Valve.
But I think you are right when you say is Air Conditioning Signal so what can I do??

I tried this and still te same.
From the description that I wrote before what else culd it be

The engine stall after the AC has been on for a while
The AC cools perfectly
I think the AC condenser is clean but I'm not 100 %sure about the location of it
If I keep the AC running with the RPM...

I haven't had any work done because it was woking fine
And is a manual transmission also the condenser fan works well

[QUOTE=txgreasemonkey]Before doing anything else, check for codes. Next, warm up car and set idle rpm to specs. Possible problem areas include:

. Air Conditioning Signal--this signals the ECM,...

When I turn the ac on and get to a stop the rpm drop to 0 and the car felt like it is going to shot down but with the ac off the car works fine . What can that weard symptom be?

Ps.I live in...

I have the same problem but only occurs when the A/C is on so I can't use the a/c
Please help I'm in miami and is veryyy hot