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engine wont rev over 4000 help

 
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Old Nov 23, 2005
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engine wont rev over 4000 help
ok i installed dx engine in my 02 ex temporarily with ex ecu and it wont rev over 4000 i think its the vtec ecu anyone have any suggestions or a lx/dx ecu ?
Old Nov 23, 2005
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computer is waiting for vtec to kick in...but no vtec..

im not really sure...but tahts my hypothesis
Old Nov 24, 2005
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yeh i agree need to know what to do to fix it or should i just get a dx/lx ecu
Old Nov 24, 2005
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i got an lx/dx ecu with the key for it so you won't need a reflash. sounds liek a vtec problem.
Old Nov 25, 2005
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Originally Posted by rice4lyfe
computer is waiting for vtec to kick in...but no vtec..

im not really sure...but tahts my hypothesis
you my friend are correct!

i wouldnt drive your car like this, this can just mess up your motor, since your not running the right ecu for it.
Old Nov 25, 2005
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yeah think about it. ECU waiting for signal that VTEC is engaged.. but never gets it. So ECU says "Somethings wrong!" and stops it there. up until VTEC engaging, or beginning to, the engine is running fine. After that point the ECU is protecting the engine, because it thinks that you have a VTEC head thats malfunctioning somewhere.
Old Nov 25, 2005
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I also think that is obviously an ECU sygnal problem caused by vtec - nonvtec engine difference...
Old Nov 25, 2005
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yay i win!! what do i get?
Old Nov 25, 2005
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Old Nov 26, 2005
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<---newbiest : Isn't there a v-tech controller where you can set it at a certain rpm to kick in?
Old Nov 26, 2005
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there is a vtec controller that does that but its useless if you car aint running right to begin with.... it only works as a bypass if you have a dx/lx ecu running an ex motor.. then you can use the controller to control it like that also
Old Nov 29, 2005
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Stupid question but why would you replace a EX engine with a DX.

DX has less hp than EX
DX has no VTec
DX = slower

Just curious.
Old Nov 30, 2005
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better mpg?
Old Nov 30, 2005
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he said its a temp... so maybe hes working on building up the ex.. who knows !!
Old Nov 30, 2005
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ok this was answerd a bunch of times now. so im locking this.
 
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