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well i'm trading one of my old cars for this car - its a 50th anniversary edition, supercharged v6, according to owner the super charger has been removed as it failed, so they took it back to standard V6 but didnt change the loom and ECU. It has bottom engine knock thats why im trying to work out if i need to get an engine, loom and ECU. OR just a new engine as i thought they would have had to change the ecu and loom already if the supercharge removed.So are you trying to determine whether your stato was factory supercharged? Check the alloy compliance plate on the firewall. For Eng it will say 'L67' if it was a fatory supercharged 6.
The supercharged and ecotec looms are different, mainly due to the supercharged loom having the coolant temp sender and sensor at the rear instead of the front like the ecotec and it will also have additional plugs for the boost control solenoid etc. Are there any unused plugs in your loom? If what you suspect has been changed to basically make it a low compression ecotec, then its probably had an ecotec loom and pcm fitted.
Re: the supercharged 6 running lower compression, no this wont be the cause of developing a bottom end knock. It would still run fine on an ecotec tune, but probably down a little on power.
I may have missed the point, but what exactly is the scenario and what are you trying to determine???