OrionRST200bhp

iTrader: (1)

Fitted a new phase sensor and the car is still violently holding back and back firing like hell sounds like an automatic shot gun going offs (sounds good) when you put your foot down just after 3k revs it jolts,cuts out and back fires like mad what else could be cusing this. now i know i have a dodgy lamba sensor frayed wires etc. but surely that cant be causing this crap to happen?? crank sensor maybe??? any info would be great thanks. also the spark plugs are choked to hell.

Graceland

Whats your rev counter doing when this occurs? Does it bounce about between zero and the RPM the fault starts at?

OrionRST200bhp

iTrader: (1)

no mate it bounces when it cuts out,just once. someone else said about the bouncing, i'll double check tomorrow but i dont think it does that.

Graceland

check your crank sensor and associated wiring plug and also ensure your phase sensor is plugged in the right way round

Big Will_

Check crank sensor condition (wiring where it enters the sensor is common to perish) and check gap is 0.8mm.

Also, if the car has a knock sensor, check that the knock sensor and phase sensor plugs are the right way round!

OrionRST200bhp

iTrader: (1)

would it still be possible to drive it and start it if they where the wrong way round???

sir nose

iTrader: (3)

could it be an air leak?

tabetha

I'd start by fixing the things you know are wrong first like the lambda wiring, the cps gap only needs to be near enough, will work outisde these limts to an extent.
I would pay particular attention to the cps connector on the loom side.
tabetha

Toe Knee

iTrader: (2)

have u checked to make sure all the crank lugs are in good condition ie no chunks missing?!

OrionRST200bhp

iTrader: (1)

lugs are still there,
would you say change the crank sensor anyway for a new one? need it running right to travel up to oxford then on to MAD for a setup. could the lambda cause it to fcuk up like this?

LHD220Turbo

iTrader: (4)

CPS or phase sensor wiring

has it only just started happening?

edit: check the pipes to map sensor

Big Will_

Car will start and run (badly) with phase/knock the wrong way round.

To dismiss the lambda from the equation you can unplug it. I've never known one to cause the symptoms you describe though.

Normally a violent hesitation/holding back is crank/phase related.

If you crank sensor is the original white wire one then i'd definitely change it just as routine maintenance.

OrionRST200bhp

iTrader: (1)

my crank sensor is the original white one. about time it was changed then.lol.

Big Will_

That was the one that was put on from new then

How many years old?

ECU Monitor Enthusiast

iTrader: (1)

Does the rev counter jump around when this happens ?

OrionRST200bhp

iTrader: (1)

the car is a J reg 91 hahaha, change it then.
no mate stays just under 1k revs