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Old Feb 10, 2006
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ecu problem

okay...i'm in the middle of swapping a k20 and i have everything hooked up and ready to fire up the car....all harnesses are plugged in and i have fuel and spark....the car will crank...but will not start

so then i try using the ecu from my single cam d motor....it starts up right away....so i try to use the ecu i was given for the swap and it still won't start..

is this a fried ecu...or something else

do i need to get my key matched to the ecu at a honda dealership?
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Old Feb 10, 2006
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yes the last one. ecu doesn't recognize the key code.
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Old Feb 10, 2006
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which k20 motor and ecu do u have?

if you have the type r ecu, there is a fix u can do temporarily to start it without reflashing the key.

don't run the itr ecu with a k20a3 or a2 though.
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Old Feb 10, 2006
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not a type r ecu...


i figured it was probably the key not being recognized...but it cranked so that threw me off a little bit
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Old Feb 10, 2006
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if you have both spark and fuel in the cylinder, it will fire.

fuel + air + spark = boom

if its not starting, you are missing one of the above. (unless the cams are installed incorrectly)
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Old Feb 11, 2006
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you need to reflash the key to work with your ecu. the immobilizer is kicking in and not allowing you to start the car.
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Old Feb 11, 2006
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the immobilizer eliminates the spark, right? Or does it eliminate the fuel? I know it cuts one of them.
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Old Feb 11, 2006
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it elminates both... there is a way to get around the fuel pump on the US ecu but not the spark.. thats built into the ecu.. why do you think everyones using kpro... if not then you need to get the ecu reflashed
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Old Feb 11, 2006
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fuel pump definitely primes...i'm not sure about spark...

if i was to get my ecu reflashed by hondata would that eliminate the immobilizer...i know that you have to send them your key, ecu and immobilizer..would that work?
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Old Feb 11, 2006
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it is supposed to cut fuel and ignition
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Old Feb 12, 2006
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if you fix the immobolizer by getting your key reflashed then yes it will work
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Old Jul 5, 2006
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help anyone know where i can get ex ecu 5 speed and key ??
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Old Jul 5, 2006
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Look into "For Sale" forum or ebay
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Old Jul 5, 2006
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if you don't have k-pro and you don't have a typ-r computer you will need to program the key witch will have to be done by the honda dealer, i mod cars and know what needs to be done plus i work for a dealer do check your pm and i will get it done for you
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