Re: Maf and lambda change
Didn't I sat 'Lambda' when you mentioned it. Although I think you had already changed the MAF at the time.
The car will nearly always surge when cold until the lambda is up to temperature. The OE ECU is worse at this then the Apexi.
When they fail they tend to send a lean signal to the ECU hence the ECU will be thow fuel in and run rich at idle/cruise. This is why so many lambda faults are picked up at MOT as it will be running too rich to pass
The ECU can also use the offset it needed to apply to fuelling based on the lambda to adjust on boost fuelling, and hence on boost you may also of been running rich.
The later cars do this alot more then the early ones as the ECU is alot more inteligent. It can add a +/-14% difference. And can throw a CEL if it get this bad (a badly mapped car will also do the same).
The early cars tend not to throw a CEL and infact you can drve with the lambda disconnected. It runs smoother when cold like this due to the ECU not recieveing confusing signal from a Lamda going through the warming up process.
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