running lean at night
02-22-2003, 12:29 AM
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running lean at night
it's funny my car runs fine during the day. but at night it runs lean. why is this and how can i fix it? is it a temperature thing? it's been like this for the past week.
02-22-2003, 01:05 AM
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Re: running lean at night (PureTeg420)
to help you guys out have a better picture, i'm running a drag 3 kit on a b16a only boosting 5lbs. fuel management is a MSD fuel pump and a 12:1 fmu. car was running fine for three months now nite and day it was all good. just this past week it runs lean at night. i live in HI and the temp change isn't that big from day to nite, maybe 79 in the day and 65 at nite. could it be my spark plugs or sumptin cuz i gots oil in the spark plug holes wen i pull my wires. thanx for any help.
02-22-2003, 05:23 AM
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Re: running lean at night (1tyme)
the oil in your spark plug holes is from bad valve cover seals that enclose those holes from the rest of under the valve cover...
I had the same thing going on with the oil and the lean-out during the nights. All it takes is 15 degrees difference to throw things off.
why do you htink people spend $300 on a cold air intake? cus it draws in colder air making more power(2 or 3hp)(and its also why most retailers sell the fpr and computer chips along with kits to compensate for the colder air temps).
Ya this was way to long. Do a search reguarding "More boost when cold?"
Or something...there was a huge speel about that...
I had the same thing going on with the oil and the lean-out during the nights. All it takes is 15 degrees difference to throw things off.
why do you htink people spend $300 on a cold air intake? cus it draws in colder air making more power(2 or 3hp)(and its also why most retailers sell the fpr and computer chips along with kits to compensate for the colder air temps).
Ya this was way to long. Do a search reguarding "More boost when cold?"
Or something...there was a huge speel about that...
02-22-2003, 09:02 AM
#6
What is this crap?
Re: running lean at night (b16ahybrid)
if the stock o2 sensor is showing lean, then you're leaning out to 14.7:1 in boost, which is something i wouldnt do even at a modest 5psi.
02-22-2003, 09:17 AM
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Re: running lean at night (1tyme)
of course, you could have a poorly powered/grounded gauge, and its the addition of the headlights as an electrical load which makes the gauge think you are getting lean.
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02-22-2003, 11:01 AM
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Re: running lean at night (falconGSR)
if the stock o2 sensor is showing lean, then you're leaning out to 14.7:1 in boost, which is something i wouldnt do even at a modest 5psi.
02-22-2003, 02:23 PM
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Re: running lean at night (Tinker219)
so if the cold air is making me run lean how do i compensate for it. lower the boost at nite? i'm running a inline fp and fmu for fuel i thought that was ehough fuel for 8lbs. and i'm only running 5lbs. as for the poor ground i'll try gas it with my lights off in the nite to see if i have a poor ground. thanx for the help so far any others? could something be mechanically wrong because it ran fine just until this past week.
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