Originally Posted by megatron-uk

I did buy a known chip - the MSD chip was specifically for my setup when I bought from MSD it after rebuilding the engine completely (every sensor is new, all new Bosch injectors, rebuilt turbo, by nut and bolt rebuild, I mean it - it's a MK1 Escort that we have built from bare chassis up). It's their 320bhp version with the closed loop control and other add-ons... But it has never been able to idle properly, has always stunk of fuel, the ISCV never seemed to do anything, was really eager to stall and has been impossible to achieve a reasonable AFR at idle.

Swap to this no-name "dark greens" chip and the difference is night and day. Clearly the standard chip was not going to be optimal, but short of taking the car over to Blackpool I didn't have much of an option than to try several other maps.

I will clarify that I am not having a go at MSD; Stuart has been nothing but helpful with the kit I've bought from him. But there's clearly some interaction between the MSD Evo chip and my car that means it just won't run right. Swapping the chip was the last thing I had available to try.