Try after the IC first, you could spray the IC but I personally think it`s a wase of demineralised water, maybe rig a seperate system up with tap water for the ic sprayer?.
Try straight demineralised water first, then maybe a 30% methanol mix to see if it gives any improvement.
Depending on the volume you`re spraying,much more than 30% meth will have an effect on the fuel mixture/ afr that you can`t tune to compensate for.
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VW Mk2 Golf 16VG60 - Mitsubishi GTO TT
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