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  #1  
Old 11-08-2004, 03:29 PM
JustChillin023 JustChillin023 is offline
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Can you burn out your VTEC???

I Got a 97 Prelude with many mods including a VTEC controller. One day someone switched the VTEC to kick in at 2300 RPM's. I drove like this for two days before realizing what was truely wrong. Now, when VTEC kicks in, it takes 700 or so RPM's to kick in (I.e. i set it at 5200 and it kicks in at 6000) and it feels really week, especially compared to what it was at before. If anyone can tell me what kind of damage I have done and/or what i could do to fix it would be very helpful. And the Engine is a Stock JDM engine, and the head hasn't been taken off before so It's all stock internals. If I left it like it is, would just the VTEC be messed up and the normal reliability of the Engine fine?
Thanks in advance
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Old 11-09-2004, 05:22 PM
Crucified Ego Crucified Ego is offline
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Re: Can you burn out your VTEC???

Well.. it could very well be that something went wrong. However, VTEC is basically just your ECU controlling your valve timing differently at higher RPMs, so, there's a short list of things that could be wrong, especially if there's no CEL. Perhaps the ECU is just off a little? Try lifting the fuse for that, or is there a vtec fuse as well? if there is, lift that for a few seconds as well to clear it. See if that doesn't fix it right up. If your vtec goes out, your engine will still work fine, you just won't have the great performance you're supposed to.

-J
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Old 11-11-2004, 05:52 AM
Interlude Interlude is offline
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err.. VTEC is set at a high RPM for a reason! It is totally useless to be in VTEC at low RPMS...you are actually making your car slower.

Crucified Ego may be onto something when he mentioned the ECU. OBDII ecu's record much of the engine's stats, and compensates for them. You may have screwed it up when you had the VTEC point lowered. Try pulling the ECU fuse or disconnecting your battery for a few minutes.
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Old 11-11-2004, 01:04 PM
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Prelewd Prelewd is offline
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Re: Can you burn out your VTEC???

That sounds like what the problem is. Your OBDII just tried to compensate for a higher cam grind and all the settings are now wrong. Just reset your ECU first and see if that works.

Do yourself a favor too, and never set your VTEC engagement point that low again. Like interlude said, it's useless at low RPMs on a stock car.
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Old 11-12-2004, 07:34 PM
JustChillin023 JustChillin023 is offline
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Yeah I let someone else drive it and they switched it accidentally while they were playing with it. I still have a lot to learn but i know not to set it nearly that low. And since it doesn't switch until the car is turned off and back on, it didn't act differently for him, just me the next day when i turned it on. I tried disconnecting the battery and the ECU reset. But this still didn't fix it. I now realize that it just doesn't kick in at all. When i rev it to 5200+ now, it makes a fizzing sound, but not the prrrr of the VTEC kicking in. Thanks for your help in advance again.
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