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|22-06-19, 03:49 PM||#1|
Join Date: Mar 2018
Location: Central London
1.6Vti Adaptives - Reasons for Retarding Ignition
With an MOT due very soon I thought I'd look over the Engine ECU with Planet 2000 to see if anything was lurking.
Mine is a 2008 207SW 1.6Vti with 61000 on the clock. Mainly motorway runs of 60 to 150 miles. Driven enthusiastically
What I noticed was in the Adaptive Values applied that cylinders 1 and 4 have ignition timing retard values of 0 (the default setting if no knocking is detected) whilst cylinder 2 and 3 have retardations of -3deg and -5deg respectively.
Clearly the ECU reckons it's detected knocks on 2 and 3 and has applied ignition retards for just those two cylinders.
Spark plug colours look healthy and pretty much identical between the cylinders.
So my question is: What is the most likely cause of knocks on individual cylinders on these 1.6Vti engines? Injector issues? Coil packs?? Good old fashioned carbon build-up???