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Thanks to Dave for pointing out that the ecm can shut off an injector if misfires are frequent. Not quite part of this post but when i changed out a faultily cop and I replaced the plugs my fuel consumption seems to have gone up a touch based on the cars calculation of fuel consumption. The plugs seemed to have some whitish deposits on them (80,000 at least km's on them) and all looked nearly identical including the one with the failing cop. I hope that would not contribute to burning a piston from lean running and undetected detonation. at 255kms it seems to run better than it ever has with us.