My mates escos won't rev properly past 4k I starts poping and missing
Any ideas what it might be?

 

Small turbo or big turbo???

I'd start by looking at the crank and phase sensors, mostly likely it'll be that.

 

If its a Weber version on P8 then its most likely in limp home mode which is a probably sensor failure. Have an expert plug into teh ECU and analyse the datastream.

 

K plate big turbo. It's been on a diagnostic machine today and is picking nothing up. But been told that the engine loom plug corrodes on them so we are going to give them a clean and try that.

 

Not my car but the things that have already been checked:
phase sensor condition and gap:0.2mm
Plug gaps: 0.6mm
New rotor arm and cap
New leads
CPS gap 0.8mm
Car will pull past the 4000rpm but appears to misfire until through.
car is running greens and a chip, boost is currently 20psi peaking at 22psi.
Headgasket has recently been changed.

 

My cars doing the same thing! Iv changed every sensor it has, fuel pump.... everything still the same! Have you solved it? Its driving me fucking crazy.

 

just looking on youtube and found this mate.when it gets to near 4k revs it misfires
says the wires to the phase sensor wire was reversed,may happen if the wire is broken in standard way round
http://www.youtube.com/watch?v=khjbJ...eature=related

 

When mine last did this, it was the CPS (does the rev counter jump about at the same time? If so, then deffo this, otherwise as Stu says, it's in limp mode).

 

i had a similar prob on my 4x4 sapphire, turned out to be a trapped wire in behind exhaust heatshield somewhere?

 

mine did this running thing a few months ago it was a corroded wire to the tps i replaced it and instantly cured!!!! BUT its just started playing up again this time its reving up and down constantly, just put a brand new iscv on today and still the same?????????????????? any one got any ideas????? Just wandering if a cossi is in limp mode how do you clear it?????? disconnect ecu???

 

Mine was doing exactly this before I stripped it to a shell for the resto. I'm guessing becasue my front crank seal was leaking, the oil was smearing the cps sensor and I was wiping all the crud off it every couple of weeks

I'm hoping it does'nt return when it's rebuilt.....