Technical Multijet 4x4 engine vibration?

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Technical Multijet 4x4 engine vibration?

jamesd84

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Dec 2, 2017
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Hi All,

I purchased a late 2014 4x4 1.3 multijet about a month ago and have a question regarding an issue/characteristic;
when accelerating from 1500rpm (more so in higher gears) the engine vibrates quite a bit until it reaches around 1750rpm then it is perfectly smooth, this is much worse when going up hill, just wondered if this was normal or not?
Im guessing it doesn't have a dual mass flywheel as the rev counter doesn't fluctuate when letting off and reapplying the throttle in gear.

Should add that I'm used to driving a new Vauxhall vivaro which will quite happily pull from just over 1000rpm, I know its a totally different engine and has things like a VNT turbo and square bore/stroke ratio.
Any advice appreciated
James
 
Odd one.
I had a Doblo Van (2012) with the MJ engine. I do believe that there was a little bit at certain speeds under full throttle some vibration. I put it down to stiff engine mounts as a loan van was the same.
Regarding the DMF I have had many vehicles with a DMF and have not seen the rev counter move up or down when applying the throttle or lifting off. If that was the case there must be far to much slop between the sections of the flywheel, there is only a few tens of degrees on them.
A square engine (bore and stroke the same size) usually produces less torque at low speed as the piston speed is lower, an under square engine produces more torque at lower speed as the piston speed is higher, conversely with over square engines even less low speed torque than a square unit.
 
Thanks for getting back to me, I've had a good look and on jacking a front wheel up there doesn't appear to be any accessive backlash and no knocking from clutch area when rotating the lifted wheel; so I don't think its an issue and just a characteristic of the car.
I guess with the 'square' engine having less torque at low rotational speeds it wouldn't cause as much vibration.
Its perfectly liveable to be honest as long as I keep it out of 5th gear when doing 40mph.
Also fairly sure it has a solid flywheel?
James
 
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