a scary moment
 

after my mechanic fixed my idling problem (mal-functioning IAC valve, and an air leak), my car was running beautifully. However, today I made a quick trip to the liquor store and my car did some crazy idle revs. It would go from almost 0 to 2 RPM and then back down. It even stalled on me once. On the way back home it seemed to be back to normal, I unplugged some of the spark plug wires to make sure all spark plugs were working, and sure enough it was stable at 1 RPM. However, that was a scary moment. Also when my car is cold I hear a liquid-like sound coming out of the center panel (or maybe the tranny?), and I have no idea what it is. When I start my car cold or I rev it when its cold, I hear that noise. The more I rev the engine the louder the noise is. As a matter of fact, this isnt the only MKIII Ive heard it in. Any ideas if theres something my mechanic missed?

top off all coolant radiator and over flow bottle upfront . burp the system if needed
watch for coolant leaks over the next week or few days and see if you loose fuild

Best way to "burp" the system is to jack up the front of the car or park on a steep hill and then fill the radiator. Just sitting there, the top of the heater core is higher than the filler cap on the radiator and you will almost never be able to get all the air out.


Russ

thanks guys. im taking my car back to my mechanic so he can check out that idle.

You ,might have ur mechanic check ur fuel system o2 sensors etc.. if it smells like gas when u have it idling it probably has a bad o2 sensor...

Ya you definently do have some air trapped in your cooling system. Mine does that after I changed the HG.
As for that idle, check your TPS. But I know this happens with a vacuum leak too.