EML and revs cutting at high rpm

[Rich]

Anyone had this problem?

Ive sorted the missfire that my car had, to find out im back to square one how it started

Its bringing up o2 sensor code for open circuit. I put a new o2 sensor on with no change, new afm, tried numerous crank sensors.

At high revs the revs just freeze like hitting the limiter but it just pops and tries putting me through the windscreen. I can let of the throttle and put my foot down again and it will still drive ok

[John]

Sounds like a fuelling problem rich? What tank/pump set up are you using? i had a similar problem on the standard inlet setup that turned out to be a fuel pump issue. Mine was strangled at high revs, sometimes it wouldn't rev past 4k. As soon as you let the throttle off it would run ok again for a few mins, then start again.

[Rich]

Its in a corsa sri using standard fuel pump, was fine with the 1.4 but then that wouldnt take as much to keep the engine happy (c14se)

Its actually been overfuelling

[John]

An extenal pump rich? or in tank? Iirc the intank ones have to be from a 16v corsa. The way i found the problem with mine was by rigging a fuel pressure gauge across the rail, and then taping it to the screen and going for a drive.

[Rich]

I thought the intank pumps just had to be a multipoint one? Think its a corsa sri intank pump i used in my xe nova. Ill definatly look into the fuel pressure though cheers

[ck]

if its saying open circuit for the o2 sensor then theres a break in the wire if you've replaced it.
is antyhing else coming up when reading the fault codes off the ecu?
as long as its a multipoint injection pump then it should be fine.

[Rich]

it goes closed loop fine, but will randomly go open loop again, thing is its a new loom as it did the same with a different loom

[Adam]

Cam sensor

[Rich]

You head of it being problem before? Ive been trying to get hold of one to try as im convinced its the problem, but noone seems to agree! Including all the vauxhall techs at work!

[Adam]

It causes the exact problem you describe, get to certain revs (usually about 4500rpm, and then it starts struggling/missing)

Shame your not closer, you could lend my sensor
Couldn't think of much else it could be tbh. Tried a spare coilpack?

Got that sticker btw, cheers :D