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Hi ,I have two rc51's one 2000 great, the other a 2005 can't get a spark, any ideas? I've went as far as to switch out the ecu and converter box, still no spark,
 

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Start by checking for a "live" Balck/white line coming out of the bank angle sensor relay.

And of course check all the fuses to be OK. Inside the fuse box, on the starter relay (30A) and the single one coming out from the battery's positive terminal.

Downloading the RC51 Service Manual will definitely help you a lot :)
 

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I wouldn't switch ecu's. You're trying to get a sp2 to run on a sp1 ecu. It's much different, don't even know if it will work. Might run terribly lean. And hot, as the SP2's cooling function comes from the ecu, and the SP1 ecu will not operate the cooling system.
Does the fuel pump prime when you turn on the key?
 
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