ItsmemishG

Hello everyone! newbie of this forum here.

I recently started noticing a moderate and short lived jerking/shaking when 1. press the gas pretty hard when getting onto the freeway and 2. slowdown for traffic and accelerate again to the 50-60 mph range, it lasts about a few seconds but very noticeable and it goes away. i don't experience this when driving low speed on surface streets. I visited a certified mechanic and he believes that this is due to the worn out engine/transmission mount and replacement would cost $1,400 and should resolve the jerking issue. If anyone had the same problem i would really appreciate your advise!

2014 C 250 with 70K miles
there is no warning lights on my dash
recently replaced all sparkplugs to resolve P0304 code
recently replaced throttle housing to resolve P0068 code

Thank you in advance

TimC300

You can check if its the engine mounts by just being in park and rev the engine, see if the engine moves excessively.

Odd Piggy

That price sounds high for a C250, but LA prices may be higher than Houston. If the suggestion from @TimC300 does not show any issues, scan the transmission for codes. Many transmission problems don’t turn on the CEL.

BlakeyBoi

So the trans mounts and the engine mounts don’t actually go out man. I own a 2014 c250 and also a certified mechanic. I know the c250 in and out.

Your lack of power is going to be
1) Coil Pack is shorting out because water or oil is in the plug hole or holes. Or Coil is going out.

bazzbazz

While I can't comment on what the actual issue is, (not enough info, too many possible causes) are you saying the engine/transmission mounts never fail???