If you guys remember I made a post a few weeks ago about my idle problem when I first start my car. The video below shows you what my car does at first. However sometimes the idle drops down too low when its doing that and stalls out.
Check the video out again:
Start Idle Problem Video
I thought maybe it was something fuel related. When it would stall out and I would crank it over again it was almost like the car had no fuel? So I went ahead and installed another fuel pressure regulator and fuel filter. Now the car hasn't been stalling a few days so I have no idea if replacing those parts will help if it does stall again. However after replacing those parts the car still does the funny idle on startup.
I scanned the car when i first started it and it ONLY seems to do this revving up/down while its only in open loop mode. ONCE it goes into closed loop the car idles perfectly?
As soon as I started the car while still in open loop I noticed that the 02 was reading over 1000 and the LTFT go from 0.8 to 14.1. Now the LTFT goes up to a max of 14.1 while the Rpms are dropping. Then when the rpms start going back up it drops down to 0.8. Its a smooth travel between 0.8 and 14.1. I also notice that the map sensor starts going up right before the rpms revve up. Then the Map goes back down again right before the rpms start dropping.
During normal operation temperatures the delay for the car to go into closed loop is 10 seconds. Right after 10 second is when the 02 sensors pulses on/off and the LTFT goes and stays at 0.8 and the idle is smooth?
I have a feeling I need to make an adjustment to one of the tables in my Pcm for then the car is on open loop mode? Would I make any changes to the "Startup AFR Correction" while in Park/Neutral? Should I decrease the seconds till the car goes into open loop when its at operating temperatures?
I have a scan of the car when it starts so if anyone would like to take a look at it let me know. I hope someone can give me a hand because this revving up/down at start is getting annoying.
I also forgot to say that I have cleaned my Air filter and also the MAF sensor a few days after I cleaned the filter.