Turning on AC/Idle issue

[gw33gp]

Recently, I have noticed that when I turn on my AC when idling, the idle will drop to around 500 rpm and the AC will kick out and the idle will go back up to normal. After a short time the AC will kick back in and go through the same cycle.

If I increase the rpm to a little over 1000 rpm the AC will kick in and stay on. If I then take my foot off the accelerator pedal the engine will almost die and the AC kicks out again. If I very slowly let up on the accelerator pedal the idle will take over at the normal rpm and AC works as it should. When I am driving stop and go the AC works as it should. It is just an issue when turning on the AC at idle.

I know the Idle Air Controller controls the idle and usually is quick to adjust the idle when the AC is turned on. It seems to be slow to respond now. I never had this problem before. Is it possible the IAC is sticking and could be the cause of this slow response? Is there something else that could cause this issue? I guess I could try cleaning the IAC to see if it helps.

 

[fastpakr]

That's definitely what I'd be checking/cleaning first. Also, is there anything in the documentation on how to test it electrically as well to ensure that the ECU is signaling to advance idle speed?

 

[saara]

I still run my old Meyer 6 volt T-5 Snowplow pumps on 12 volts. The old 6 volt motors had really heavy windings. Today's motors, more than likely, have minimum gauge wiring and would fry.

 

[85_Ranger4x4]

I still run my old Meyer 6 volt T-5 Snowplow pumps on 12 volts. The old 6 volt motors had really heavy windings. Today's motors, more than likely, have minimum gauge wiring and would fry.

Be sure to check the windings in your IAC.

 

[55trucker]

That's definitely what I'd be checking/cleaning first. Also, is there anything in the documentation on how to test it electrically as well to ensure that the ECU is signaling to advance idle speed?

Use a digital voltmeter & backprobe the contacts to the IAC, you should see the voltage on the meter change to correspond with the PCM commanding the A/C to engage & when the PCM disengages the A/C.

 

[gw33gp]

Please tell me what Meyer 6 volt T-5 Snowplow pumps have to do with an A/C and idle issues.


Thank you 55trucker for the advice on checking the IAC with a voltmeter. I will try that if cleaning the IAC doesn't work. I may have time this weekend to check things out.

 

[55trucker]

Congratulations!

you've officially been spammed!

 

[85_Ranger4x4]

Congratulations!

you've officially been spammed!

I probably should have deleted it when I canned the poster, I thought it was funny and too off the wall to cause harm.

It is a repost of a post Doofy posted a few days ago.

 

[gw33gp]

Congratulations!

you've officially been spammed!

I feel so violated.

I did get a chuckle out it 85_Ranger4x4.