Fuel leans out when outside temps drop.
#1
Elite Member
Thread Starter
iTrader: (8)
Join Date: Oct 2007
Location: Dallas
Posts: 1,829
Total Cats: 0
Fuel leans out when outside temps drop.
I thought high temp leaned cars out. When the temps drop into the 70's my car starts running lean, and all over the place?????
I would adjust it. But when the temps are back to 90's in the afternoons it runs great??????
I'm still new to this MS, what do I need to adjust and the retard version please.
I would adjust it. But when the temps are back to 90's in the afternoons it runs great??????
I'm still new to this MS, what do I need to adjust and the retard version please.
#2
I'm interested too. Mine does the same thing, but on a smaller scale.
FWIW, hot air has less mass oxygen per unit volume. So if fuel stayed constant, cold air= more oxygen, hot air = less oxygen.
I'm sure MS is somehow supposed to adjust for IAT, right? I wonder if this is adjustable. I know warm up enrichment is. I guess the IATcorrecting for VE tables is a fixed table that's not adjustable?
FWIW, hot air has less mass oxygen per unit volume. So if fuel stayed constant, cold air= more oxygen, hot air = less oxygen.
I'm sure MS is somehow supposed to adjust for IAT, right? I wonder if this is adjustable. I know warm up enrichment is. I guess the IATcorrecting for VE tables is a fixed table that's not adjustable?
#6
Elite Member
iTrader: (21)
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
but unless he made some changes to the RPM range in which it's active it would only apply to idle. Or am I not remembering the default settings correctly? Or is he not talking about driving even, just idling?
#8
Elite Member
Thread Starter
iTrader: (8)
Join Date: Oct 2007
Location: Dallas
Posts: 1,829
Total Cats: 0
I should have the correct firmware. And I'm running 9093 without AFM. I have not changed anything besides O2 sensor to wideband, and VE values.
I quess I need to check the air density correction values. I have never messed with them.
The car starts out idling lean to rich. And when I start to drive, the afr's are back and forth.
After warm up, Idle is rich but works, cruise is high, like a full point higher. Like 15-16 and bumping 17 sometimes.
But as soon as the outside temps hit the 90's, cruise is back to perfect. Never over 14.3- 14.7 everyonce in awhile bumps 15. for a blink of the eye.
Thanks,
Any ideas are appreciated.
I quess I need to check the air density correction values. I have never messed with them.
The car starts out idling lean to rich. And when I start to drive, the afr's are back and forth.
After warm up, Idle is rich but works, cruise is high, like a full point higher. Like 15-16 and bumping 17 sometimes.
But as soon as the outside temps hit the 90's, cruise is back to perfect. Never over 14.3- 14.7 everyonce in awhile bumps 15. for a blink of the eye.
Thanks,
Any ideas are appreciated.
#11
Elite Member
Thread Starter
iTrader: (8)
Join Date: Oct 2007
Location: Dallas
Posts: 1,829
Total Cats: 0
The thing that gets me is,
my tabs gray out, and when I open new tabs and close them out, the dual ve and spark like to stay gray for no reason.
I wounder if the overboost is what is shutting my car off at 9psi. Or is that only for ebc?
#13
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,338
Total Cats: 573
I thought high temp leaned cars out. When the temps drop into the 70's my car starts running lean, and all over the place?????
I would adjust it. But when the temps are back to 90's in the afternoons it runs great??????
I'm still new to this MS, what do I need to adjust and the retard version please.
I would adjust it. But when the temps are back to 90's in the afternoons it runs great??????
I'm still new to this MS, what do I need to adjust and the retard version please.
Thread
Thread Starter
Forum
Replies
Last Post