S2000 Under The Hood S2000 Technical and Mechanical discussions.

vtec question

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Old 03-28-2006, 10:57 AM
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hey guys sometimes when i get on it and hit vtec it is just fine....then other times it will engage a litlle late or engage on time and then it feels like it will disengage or something of that nature and then reengage again....wtf is wrong????
Old 03-28-2006, 11:12 AM
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What is your criteria for when its engaging and disengaging? How do you know when it's happening?
Old 03-28-2006, 11:17 AM
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make sure you dont hit the car cold, If the temp isn't up to normal than sometimes the ECU unit will just the vtec off
Old 03-28-2006, 11:17 AM
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when it hits 6k usually it gets louder and pulls harder....but sometimes it will engage and then it wont pull as hard, it kind of feels like fuel starvation or that it disengauges from vtec for a second or two....i have a vafc (still stock settings) and there is a light that flashes when vtec hits...and it still stays on when it feels like the vtec is cutting out
Old 03-28-2006, 11:19 AM
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Originally Posted by Zaengle,Mar 28 2006, 12:17 PM
make sure you dont hit the car cold, If the temp isn't up to normal than sometimes the ECU unit will just the vtec off
yeah it's fully warmed up....the cut out usually happens between 7-8K .... i thought bad gas mabey but filled up again and it doesnt' do it as much but still does
Old 03-28-2006, 11:20 AM
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check your oil level.

assuming you're not talking about a CEL, the "flashing" light could be your oil light letting you know there is not enough pressure, which is needed to engage the hi-cam profile.
Old 03-28-2006, 11:20 AM
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mine does the same thing recently, sans the vafc though
Old 03-28-2006, 11:25 AM
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Originally Posted by Wisconsin S2k,Mar 28 2006, 12:20 PM
check your oil level.

assuming you're not talking about a CEL, the "flashing" light could be your oil light letting you know there is not enough pressure, which is needed to engage the hi-cam profile.
thanks....it is low!?!?! thats wierd...my car has never burnt or lost oil before!!! but im going to change my oil and see if that fixes it! it needs a oil change here in a couple hundred miles anyways....
Old 03-28-2006, 11:30 AM
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you should always check the car's oil level. and yes, if your oil level gets too low, you will get exactly the kind of hesitation/stuttering you described.
Old 03-28-2006, 01:47 PM
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yup, VTEC needs oil!!! Oil goes down quicker the more you use VTEC as well


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