markd89
Veteran Member
So, a little background: My setup has been stable for several years. I have a Malone tune with 1000 rpm idle and dynamic EGR and altitude adjustment, stock turbo, stock pump, Bosio DLC 1019 injectors. The pump has been resealed but not rebuilt. I am running B20.
I have hammer-modded the pump and played with IQ between 7 and 10. I know this is higher than usual, but it seemed to be what my combo needed to minimize smoke.
It used to be that I would set IQ in VCDS and it would be pretty solid or fluctuate, perhaps 0.2 +/-.
OK, so the issue:
A week or two ago, I had set IQ to about 10. All was good.
Two days ago, I had a hard start from warm and what felt like a rough idling engine. I checked VCDS and IQ was flopping around from 11.2 to 12.4 @ 32710. I richened it to 32730 which got me 9.8 to 10.2 which was much smoother and starts were easy again.
Today, again, another hard start from warm, not as bad as before and again a fluctuating IQ, not as bad as before. Again, I richened it to 32770 which got me 9-9.4.
Why is my IQ leaning itself out? Why is my IQ fluctuating more than before?
Any advice much appreciated.
Thanks!
Mark
I have hammer-modded the pump and played with IQ between 7 and 10. I know this is higher than usual, but it seemed to be what my combo needed to minimize smoke.
It used to be that I would set IQ in VCDS and it would be pretty solid or fluctuate, perhaps 0.2 +/-.
OK, so the issue:
A week or two ago, I had set IQ to about 10. All was good.
Two days ago, I had a hard start from warm and what felt like a rough idling engine. I checked VCDS and IQ was flopping around from 11.2 to 12.4 @ 32710. I richened it to 32730 which got me 9.8 to 10.2 which was much smoother and starts were easy again.
Today, again, another hard start from warm, not as bad as before and again a fluctuating IQ, not as bad as before. Again, I richened it to 32770 which got me 9-9.4.
Why is my IQ leaning itself out? Why is my IQ fluctuating more than before?
Any advice much appreciated.
Thanks!
Mark