Right ive fully re-wired, lowered, and secured the fuel pump. it now primes happily and runs hapily as it should!
There is one final problem to sort before i take it for another test run(the first ending in a tow home )
Basically when i fire up at cold if i leave it to idle straight away it will be fine, but if i suddenly throttle it, or if i generously throttle it(slowly) the engine hesitates, splutters and then most times will suddenly catch up with itself and hit say 3000rpm as it should.
Now this happens EVERY time from cold. The outside whether makes no difference. Hottest day of the year and it did it. Wet days it'll do it.

Any ideas? timing is spot on(well as spot on as can be without a vernier) and i dont know what else would cause it?

edit: if i continoulsy blip the throttle it pops and backfires badly, hence why i checked timing


xr3i mfi btw

 

could b air leak causing it to run rich plus cold start kicking in at same time check inlet side for leaks,tommy

 

good point, totally forgot about checkin for air leaks. Would this cause backfiring tho? I know it would obviously cause the hesitation

 

Air leak should'nt cause it to backfire i would think thats a fuel problem or the coldstart valve if it only duz it from cold

 

if it dose have air leak then it will over fuel wont it,on my 3i efi had air leak sounded like it had antilag cleared after 3k, dose it sound like its running lumpy on idle?

 

cars always run lumpy as its got a very lairy cam in it. So wouldnt be able to tell, but as you just said mine clears at 3000rpm like nothin is wrong

 

we stripted down inlet side forgot to put pipes back on subs for f/preg that made that happen on mine check for air leaks if ok disconect cold start or temp sensor see if it changes if so replace sensor do,Q when u start the car do you have to keep revs up or dose it do it its self?

 

will hold revs by itself tho they sit very low 600rpm yet it idles fine once warm

 

check for leaks and disconect sensors m8 see how u get on give us a shout tell me how u get on