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Jerks when accelerating in second gear when cold, 2015 Mazda3 i Sport

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13K views 37 replies 12 participants last post by  Jaimin  
It is possibly "bucking"? Usually it is the car "missing". Proper ignition of the mixture is not occurring. Usually happens when cold when you need a richer mixture. Weak spark? Tired spark plugs? Lousy spray pattern for direct-injectors?

Doubt it's transaxle-related...
 
Good points... Couple of additional points... In first gear the load on the engine is less, mebe, with less of a propensity to buck. 3rd gear and above .. is it possible that it is bucking, but in the higher gears you just can't feel it nearly as much? I have a manual Camry that bucks in second when cold, but not in first or third and above...
 
Well, especially because the A/T, in effect, behaves as an M/T once the torque converter locks up... which is very quickly after startup... and once into second, TCC is locked up pretty well soon as the first to second shift is made...