Forums Forums Enthusiast Forums A - Z Autowirral Car Firing on 3 Cylinders

It won`t be the injector then since gas (fairly sure)is piped into the inlet manifold .. I would`nt like to speculate any further mate but maybe worth getting a proper diagnosnic done on it .. If it was me I would`nt run it anymore until then .. good luck anyway.

It runs fine when driving but idles like a bitch, loud vibrates and scoffs the fuel.. Had it on computer, said cylinder 1 and o2 sensor. Fixed o2 sensor..

Idleing rough. Clean idle control valve

also change the pcv valve

Done it

Get some carb cleaner and spray around inlet manifold, and any where else air pipes are, failing that, send mrhanky a pm.

TPS issue, but only when its in the idle position...?

You have tried quite a few things and seem fairly competent with the solutions you are trying. If you are continuing to try this DIY, maybe get the emissions checked and see what the car is doing fueling wise at idle - rich or lean. From your symptoms Id suggest rich.

If the fault goes under load, then like you have already said this points to an O2 sensor - which you have changed. Has the car been code read since you changed the sensor? The issue may be a poor connection in the loom.

TBH this sounds like and electrical sensor problem, its just finding the issue on these newer cars...

Idle control valve, if sticking will reduce the air to the engine at tickover, and will give a slow idle, it shouldnt drop a pot and run rich if the idle control valve is at fault.