GM USA quote 5 to 7% fuel saving with AFM, Every few hundred kilometres i get a P3400 code, the parameters needed to set the AFM are not met by MAF, MAP and Throttle position. The vehicle then stays in 8 cylinder mode until the code is reset. The average fuel usage goes from 9.3 to 10.3 Litres...
Yes i think ill start there and manifold filter and oil pressure and look over harness. I'm thinking if i cant find anything, i might have it turned off, there must be a performance car business in town that can do that. Thank you, regards Michael
Ok thank you, its not my daily driver, its only done 3000ks in 12 months and oil is clean to the eye and i'm about to change again. Correct oil is used and normally every 5000ks so that part i know is good. It did happen two years ago, i cleaned the MAF with correct cleaner , it seemed to...
Thank you very much, It will take some chewing through but i assume you are saying whilst the code is still present and not reset, it will continue to run in 8 cylinder mode under all conditions. I guess that is good as it will give me time to get it sorted. regards, Michael
Hi All, Maybe someone can help. I have a P3400 Fault code along with engine light on. The code says Bank 1 Cylinder Deactivation System. Car runs normal , no loss of power and fuel consumption normal. 105,000 easy ks on it. Thanks in anticipation. Michael