When ever my a/c is on my jag will stumble badly from a dead stop, red light or stop sign this is very dangerous and i need to know if any one of u guys have experience this. It dosent happen with the ac off so if any can help i would be very thankful, 2002 xk8 4.0

 

Have you checked for fault codes yet?

 

Yes i have and thier are no fault codes,,,, Im thinking it could be the maf , ive changed the fuel pump thinking that that was the problem and the fuel filter, So after reading other threads about stumble at higher rpms im hopeing that the maf is bad.

 

This is a long shot, but popped into my head from another thread.

Does your voltage gauge read the same with the AC on or off?

 

Dont really know, dosent seem to go down any, but will run a test later too see if the voltage drops, What am i looking for , a bad battery or something else!

 

If it looks about the same on the dash gauge -- AC on / AC off -- and it's indicating 13.x volts or higher, I'd stop there.

Only reason I asked is that some other guys are seeing crazy-low voltage numbers and I thought if you're seeing something similar with the AC running, there could be some kind of link to the stumble.