Starting AC brings the Check Engine light

[mmechanical]

Hi,

I have a new issue.After I changed my Cam Shaft Sensor, my check engine light went off & vehicle was starting normally.
Yesterday I started my AC & suddenly for a moment I lost compression & the check engine light came up & stayed until I stopped the Car. After restarting there was no check engine light . But then everytime I am starting the AC , the vehicle is loosing compression for a moment & the check engine light is coming on.
Can you please suggest me what is happening & how I can fix this

Thanks

[Arriva]

Just a thought - could what you are saying is "lost compression" - being caused whent the A/C compressor mag clutch engages?? This could mean the magnetic clutch is going bad or the compressor is getting ready to lock up. Have some one sit in the car while you stand to the passenger/left side of the car where you can observe the A/C compressor, have them start the A/C and you check to see if the engine pulls down at this moment the mag clutch engages. If you determine the problem is the A/C compressor and or mag clutch (located on the front of the compressor) fix it before it locks up and leaves you stranded - it will break the serpintine fan belt leaving you with no power steering, no charging but immediately worse no engine cooling. . . good luck.

[RJolly87]

I think it would be best to get a code scan at this point, to see which code is being set. I would think it would be stored. That would possibly give you a place to start.

[mmechanical]

Let me start from the History of the issue...
Before Couple of weeks, I got problems starting the vehicle .It was getting started when cold but It was giving the check engine light . I got a scan done and it was indicating towards Cam Shaft Sensor.
I replaced it my self & then my Bonnie started as normally..
http://www.pontiacbonnevilleclub.com/fo ... 89#p138389
Till Tuesday it was good.
Then I started AC & the check engine light came up .. From today the engine is not getting started even.
Dont know what I should do......

[Echo SSEI]

This ia rather odd. Never heard of the car having a misfire when the compresor kicks on. Best place to start would be to check to see if there is a new code set, so we get pointed in the right direction. Don't need to start the car to see if there is a code set, assuming you have a scanner or someone with a scanner can come to you.