is the idle eratic like idling from 900 to 1200 on tick over and how do u know its notthe lambda unp0lugging it doesnt mean anything the sesnor may still be working but giving a weak signal try anothero ne if you can get hold of one or check it with a multimeter but i would be saying the lambda as i had the saem provlem on mine

I've narrowed my fez to the cat or lambda.
I've had belts/pulleys/ICV/filters/fluids/spark plugs/coil pack/MAF and ECU.
I've spent a couple of hundred getting to this point too, although tbf it needed a lot of what I've done.

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1 way to sum up the 197 is like sex, you build upto the best bit and when it eventually happens it only last a few seconds but you always want to do it again!
Poor Orange Si is hurt. Started first time after sitting for 3 weeks and with virtually no petrol in it

don't rule out your engine being fkd (i.e. low compression on 1cyl).
This happened to me, it used it idle erratically between 500rpm-1300rpm for the few 3-4minutes when starting from cold, and always stalled if you didn't dip your clutch quick enough at the first few junctions....

just a thought. not sure how mine happened, could have been my own doing when I swapped the cylinder head.....

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L333SYA - Ford Cougar 2.5 V6
RR - TBC

the lambda can actually cause engine damage normally they either give a signal where the engine will overfuel or underfuel run lean that will end up melting a piston or there will be hot spots on the cylinder bores and will eventually burn out the valves

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cud be throttle sensor

dan mine is having a similar problem pops and bangs and soundss awesome but its not right it will idle but its 500-900 rpm and is over fueling a bit, im going to buy a idle control valve now theres plenty on ebay around £60, not sure how much genuine ford ones are though

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Rip Ben Elvin (jam)

£60? Jeez, never knew they was that much! lol

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wll if i get a long enough lunch break today im gona try and get one from fords will let you know how much it comes to dan

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Rip Ben Elvin (jam)

ford are about £72 i went there the other day to get a new gasket for mine and asked about it

For a lambda sensor from ford is £160

Lambda from Euro car parts is £60. I thought that was bad.

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wats it run like if ya disconnect lamda and maf?

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Over fuels even more with them disconnected

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2.0l time

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with a turbo

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+ supercharger

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+ carrot on a stick

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Lambda from eBay £20
Catalytic Covnerter from eBay £60

Replacing both sorted my idle and overfuelling issues

All fixed now, believe it was the ISCV. Gave it a clean and it works now, idles perfectly and drives perfectly too!

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