Low on gas -> computer pulls timing ???
Thread Starter
TECH Apprentice
Joined: Jul 2002
Posts: 393
Likes: 0
From: Tucson, AZ
Low on gas -> computer pulls timing ??? Somebody posted in another thread:
>Oh and one more thing, did you have a full tank of gas? If
>you were low on gas, the computer pulls timing. Just a
>thought.
>--------------------
>Gev
Is this really true??? I seriosly doubt that, but just want to hear from somebody familiar with the subject. I don't think I ever notice any difference at the track..
>Oh and one more thing, did you have a full tank of gas? If
>you were low on gas, the computer pulls timing. Just a
>thought.
>--------------------
>Gev
Is this really true??? I seriosly doubt that, but just want to hear from somebody familiar with the subject. I don't think I ever notice any difference at the track..
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Low on gas -> computer pulls timing ??? No. This misconception comes from people realizing increased performance after a fillup. This is because when you fill up, the PCM reverts back to the high octane table if it had previously gone to the low octane table. So, IF you've been getting enough KR to force it into low octane mode, the power will be temporarily restored after a fillup (until whatever caused it to go into low octane mode happens again.)
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Low on gas -> computer pulls timing ??? If you're noticing more than slight KR at any point, then it's a safe bet that you're in the low octane mode. You can monitor your timing advance with Autotap. If you're seeing low numbers at high RPM and KR then you know you have a problem.
Re: Low on gas -> computer pulls timing ??? Is the low octane table always used when the tank gets low? If so, when does the switch from the high octane table to the low octane table take place?
Thanks,
Josh
Thanks,
Josh
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
Re: Low on gas -> computer pulls timing ??? NO.. low octane table is ONLY used when computer senses something's up... if it sees consistent KR or if it senses a problem w/the knock sensors... it will go into the low octane tables ...
The gas level does not affect it going into the low octane mode... I'm not sure how this rumour got started but whomever started it should be stoned cause it's far from the truth... if you don't believe me.. drive your car down to very little gas and watch your atap logs.. low octane tables are VERY noticable....
The gas level does not affect it going into the low octane mode... I'm not sure how this rumour got started but whomever started it should be stoned cause it's far from the truth... if you don't believe me.. drive your car down to very little gas and watch your atap logs.. low octane tables are VERY noticable....
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TECH Apprentice
Joined: Sep 2002
Posts: 366
Likes: 0
From: west coast
Re: Low on gas -> computer pulls timing ??? And one more thing, when you pull timing your milage goes down, so why would it do that when your low on gas? Like he said, someone gave you bad info.
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