I have a bit of a problem, Ive finally gotten most of the bugs out of my car and the tune is nearly spot on for the VE table so far, but i am running into an issue that is very intermittent. This problem only occurs every once in awhile, I can probably drive for 10 hours and this problem will occur maybe twice, and its completely random sometimes its ten minutes after I start the car and its at idle, sometimes its 3 hours into street tuning, sometimes on the highway and sometimes just cruising. I dont believe it is RPM dependant, Temp dependant, or anything like that, very much so random. so lets me explain the symptoms:
The best way to describe the problem is to imagine as if the fuel pressure regulator stopped regulating at the normal 3 bar system and has increased the fuel pressure to something higher, however the data i get from my logs does not display an increase in fuel pressure. basically i will be cruising, or idling around 14.7 AFR or and it all of a sudden goes to 11.0 AFR and will not recover from that. If i let out of the throttle completely it will bog down and die, so if i want it to stay alive i have to keep bouncing on and off of the throttle to keep it alive. The only way i can fix this issue is to pull over and restart the car and boom the problem is gone, literally just turn the car off and right back on and the problem is gone until its next random appearance. One weird thing i did notice is that if i keep it in gear while its doing this and jsut try to cruise itll be rich, but if i keep it in gear and give it like 15 percent throttle to accel to a slightly higher speed the AFRs are where they should be, slightly more rich than stoich, as it should be for light throttle. it is almost like the low load and idle portions of the map have gone haywire and are much more rich. I have look at all the availible fuel trims to make sure its nothing trying to change fueling, and have found nothing. I have log this instance and tried looking at any and all sensor readings and the only thing i see changing is the AFRs, I can not for the life of me find a correlation with any other sensors
I am also working on getting the VVTI working on the car and im running into issues that you can see in the time slots below. I am using the parameters provided on the ecu master facebook page and i will include a pdf of what i am following(its at the bottom of the PDF), but it seems as though i am getting some negative values and that doesnt seems right.
Times on my log that are of interest:
Cam Angle -56 at 15:35
Fueling problem at 34:00
My tune currently has the output set to none because i did not want to drive with the cam settings being wonky. Sorry for the novel, im just trying to be thorough.
Thank you,
Kyle
