8v to 16v mk2 conversion

[ajgti 16v]

HI there ,I have carried out a engine conversion from a 2.0 8v seat engine to a 1.8 16v gti engine
the reason for the conversion was a ecu failure with the 2.0 8v engine which was taken originally out of a 99 seat .
Luckily I had a mk2 16valver in my shead so carried out the conversion a.s.a.p
the loom and all usual was changed by a vw mechanic,the timing belt and service has been done all vaccum pipes have been checked also. the car will turn over but will not pick up power when the boot is put down.I would be very greatfull of any help or ideas that may help .
Thanks  P.S. the engine im using now is a 1988

[Adam]

EDIT:just re-read it....so my input was useless.

[danny_p]

its timeing related,    probaly spark

[oakgreengolf]

did the fuel pump get changed?

[rubjonny]

^^ very good point, 8v pump & lines are no good for a 16v, pressure not high enough.

[ajgti 16v]

hi ,cheers for the ideas ,yeah i changed the fuel pump to 16v ,it was the in tank pump .the other pump remains standard,
I beleive the timing was checked .what would the chances be that it is fuel realted??? thanks

[danny_p]

ahh,  the lift pump ( in tank is same  8 or 16v  ) the under car pump is massivly diffrent.   8v = 3 bar  16v = 6-7 bar