2014 isx vibration

[Unilevers]

honestly, what you are describing is too low of a final crank angle. This happens alot when tuning them and the timing is too far advanced for the amount of fuel your running. Now its more rare in stock cals, BUT ive seen trucks that overfuel from stock (drippy injectors, fuel pump actuator, wrong cal in the truck, etc) that do this. It's caused by the pistons hammering the crank less than 4 ATDC and you just hammer your rods into your crank and you get the famous big boy "Power vibration". on a stock truck you will not see if it is actually overfueling due to all the emmisions equipment.

this is easy to test. flash the lowest hp file for your CPL and test it again - my bet is is mostly goes away. another option is to have someone manually retard the timing about 2 degree's and try again. My bets are it doesnt come back when this is done.

many many people i talk to tell me they have been chasing this mysterious vibration for months and cannot find it. they think its driveline, rear ends, tranny, etc - but really its the engine destroying itself from the inside. rod bearings do not last very long with this condition. i just back the timing off a few degrees and its gone - but in a stock truck you will need to find the cause of this overfueling.