Hi I am hoping the collective can shine some light on my Engine problem, I have a Mustang 4.6 Modular Engine. I passed the I.V.A. in 2021 and I put it on the road. Three years later it's time for the M.O.T. Popped down to my local garage only to be told it's failed on Emissions. Check everything only to find that the Lambda Sensor was dead. New Lambda ordered and I got in touch with Emerald who made my ECU, they connected through my Computer while the Engine was running and confirmed the new Lambda was operation ok. Back to the local garage and yet another fail, two things the Mechanic told me, too much air was getting into the system, hence the readings were off, also with the extra air it caused the engine had starting hunting, this was ticking over between 500 and 900 revs. I bought a Smoke Leak Detector and found a few leaks at the silencer after the Lambda which I have now sorted but it's still hunting. I have done the Smoke Test on the Plenum and surrounding area and not found any leaks, even sprayed water with washing up liquid over the joins all round the Plenum but can't find the problem. Anybody had similar happen to them that could shine some light on this, all I want to do is drive the car.
Thanks.
Don
Thanks.
Don