So over a month ago from my last post, feeling frustrated to say the least with my IAC counts.....didn't know what I was going to do.....so we went on the Garage/Gettysburg Cruise and the Z ran just fine. Idle at times was up to 900r's and with a blip of the throttle, came back down to 650 or so....
Fast forward to today.....first I had only one bolt securing the EGR to the plenum, as the other bolt dropped into never never land.....so I replaced the missing bolt and made sure to tighten up all connections which I always do on a periodic basis. This time I noticed both PCV connections at the plenum took a few turns to tighten up. And I replaced one of the air horn bolts and made sure both were secure. I also noticed that the throttle is not sticking (before the engine is started) like it has at times since I applied the dag.
So I start the engine (first time since the cruise), fires right up and comes down to normal idle. Checking some other things as I let the engine warm up and off I go....outside temp is 48* and crisp....
Stop and go for a few miles with slight acceleration and I notice that the idle is coming back down to around 650r's each and everytime....hmmmm....so I pull over get out the Tech 1....hook it up and what do I see.....an IAC count of 14 @idle. Big change from the last post where it was 0@idle and would not go above a count of 17 when driving. So I keep driving...accelerating bringing the r's up to 6k and above a few times....and everytime I come to a stop, the IAC count is now at 14 @idle. The lowest it went at a complete stop was 12.....it would vary between 12 and 17 count when stopped. And the idle was anywhere from 636-652r's with desired idle @662 rpm's.
So I am assuming that I must have had a slight vacuum leak which is now corrected. And I can't really pinpoint exactly what it was I did to correct the situation. All I can say is....all appears to be just perfect.....for now...
