if all 4 new plugs were sooty then they all must have been firing ,other wise they would be clean and wet. If the EDIS module was running in limit home mode (not getting a timing signal from Ecu) then it runs fixed timing (10 degrees i think) but it should still idle.

Did the fuel rail have the pressure measuring valve on it Matthew ?, some Zetec's did and some didn't.

Jim


On 08/11/2015 08:06, Matthew Wastell wrote:
Faulty lambda should not cause that I think, the correction is maximum 20% even 
so it would be trying to lean it at that point anyway, not richen it.

Will rack my brains later. However do the map reload anyway in the mean time.

I'm erring towards ignition if not the ecu.

M





On 7 Nov 2015, at 22:31, Bob Craig <bobbycrai...@tiscali.co.uk> wrote:

Latest update.
Compressions are all equal at 115psi which I'm assuming is ok with the 
decompression plate. When I took the new plugs out to do the test they were 
very sooted up after running the engine whil watching the Megatune. Megatune 
was showing AFR of around 10,  so very rich. Could a faulty lambda cause this. 
I've read how to test the lambda out of the car using a blow torch and 
voltmeter but it seems the 5 wire wide band ones are harder to test - anyone 
tried it ?

It won't boost up to positive, just goes to 0 then backfires. Turbo issue maybe?

Bob

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