i just installed air conditioning in my car yesterday andwhen i was driving today i turn on my ac and hit the ac botton works great!

anyway when i stop at a light or when i hold the clutch down the engine idles really rough. when i turn offf the ac botton it idles normal

my vacuum system can hook up to my fuel injector for some reason i need help with that too i have a check engine lite for it.

would the lack of vacuum cause the 93 civic to idle rough while ac is on?

please help!

thanks

 

With most AC-equipped cars, switching on the AC will bump up the idle speed to compensate for the extra load on the engine. It looks like this circuit isn't set up in your car?

Yes, adequate vacuum is essential for you engine to run correctly.

 

You must hook up two wires to you ECU so that the engine will idle up when the A/C is turned ON. Did you do this?

Not sure what you are saying here. Please clarify. Do you have the vacuum line to the fuel pressure regulator disconnected?

What CEL codes are being thrown?

 

no i didnt any ideoa what wires and how to hook it up to the ecu?

anyways i looked at my fuel injector and its really abnormal. i saw this danglaling around


i have a gut feeling it part of the vacuum cycle. i looked at the vac diagram and mi say theres supposed to be a mounting pplace on the injector but theres nothin there not even a vacuum port.

could this be the problem with me engine running abnormally besides the ecu hookup?.
about the CEL i have to go back to autozone to get the codes im going to try the codes with your jumper wire trick first in your sig.

 

The small hose on the back of the fuel pressure regulator must be connected to the intake manifold in order to have proper fuel pressure. If it is not the fuel pressure will be too high and the engine will not run properly.

The other vacuum part in the pictures appears to be the canister purge valve. It should be connected one end to the manifold and the side port to the control port of the fuel vapor canister on the manifold. This system is not essential for the engine to run but it does stop a considerable amount of pollution with no decrease in performance.

Is it a stock A/C system or something aftermarket? If you are using a non-stock setup you should still wire the controls like stock. In the stock system the controls supply a ground to the ECU when the compressor should run. The ECU increases the idle speed and about 1/2 second later (after the engine has had time to respond), grounds an output which pulls in the compressor relay.

 

my engine runs normal now it wanst grounded like the wireing diagraim showed me lol. thanks guys youur awsome