yeah that sounds right. i swear its not running 100% since i had the engine replaced. i will look in to it. thanks for everyones help i really really appreciate it. cheers

I'd suspect that as well Ainsley, X block and head, C inlet manifold, loom, ecu etc.

Shouldn't be much wrong with that, although it might not work 100% due to different compression.

afm is air flow meter.
the c16xe runs an air flow meter where as the x16xe runs a manifold pressure sensor (MAP)
So the looms are different and the ecus.
I suspect that your mechanic has fitted the x16xe block with all the ancillaries from the c16xe!

Good question, I would like to also know the answer.

Have you got the chip and transponder from the X16XE? Else the car won't run.

no i have an L reg gsi. i blew the original engine up(c16xe), and rather than get it reconditioned i just got hold of a x16xe lump. gave it to a garage and they removed the old one and fitted the new one. thats all they did.
so question is do i get a x16xe ecu to go with the engine? the car runs ok but perhaps not as well as it should

well you must have a later gsi with an already ecotec lump fitted

sorry mate but im not a mechanic so dunno what an afm is.
i think it was just a straight swap with the original engine

or are you still using the afm from the c16xe?

you must have changed thew wiring loom

ok just wanna check this
i have an L reg gsi
original c16xe engine blew
so it now has an x16xe engine in there. everything else is the same only engine was replaced.
ecu is a c16xe still.
does this matter?
am i better off getting a x16xe ecu?