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2006 mercury mariner, vibration on start out then smooths off, also on left turns from start out. can feel it slightly on 2nd gear shift. tranny not slipping
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u can do this 2 ways.tranny mounts, have someone get in the car,holdbreak,put in gear,slightly ascelarate the throttle and watch the engine .in drive engine will travel forward and vise versa in reverse.believe me, if u have any bad u will think the motor is tryin to jump out. upper mount check/ 9 out of 10 times,it feels like u are in a popcorn machine when u come to a complete stop ildeing in gear, take a small floorjack and place it under the oilpan again have someone in the car . start and put in gear, just let it idle,and slightly raise just the motor and see if the vibration goes away ./ note,be sure to have a small piece of wood between jack an oilpan.
I had the same problem, after 26k miles and replacing the computer, and many other parts on the truck transmission they replaced the tranny....same problem. In short, and another tranny they found small alum shavings in the tranny cooling system...they then replaced all lines, coolent and tranny radiator (cooler )with another new tranny....problem solved. It was the tiny metal shavings in the tranny cooling system that continued to circulate the system.
well if the shifts are all late then they may feel rough.This could be caused by a bad throttle psition sensor and this common on nissians. If the shifts are times correctly and you feel a slide - bang in 2nd then this is usually the beginning of the end.
Why are you shifting from 2nd to 3rd gear ? is this a standard or automatic? If its a automatic its normal for the torque converter to catch up with the speeds of the tranny. To save the life of your tranny try to let the tranny do the work by itself and don't shift unless in adverse weather conditions.
I have seen this happen in numerous cars, I have a mazda that does that, my buddy has an 04 suzuki aerio that does that etc etc etc....
There really ins't a "fix" for that as it really is just what late model manual trannys do, all you can do is just let your car warm up. If you are really concerned you can throw a new tranny on there but once it gets broken in it will start doing that too. Sorry!
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