Engine vibration at low revs

[Mungus]

:b: I have noticed a vibration from my engine when in park or neutral at around 2000-2200rpm. I wonder if anyone has had this before and can point me in the right direction to isolate the problem easily. All i can think of at the moment is things like; unbalanced crankshaft, harmonic balancer, sloppy piston; but really have no idea except i think it will be expensive to fix. :b:

 

[calaisalltheway]

2000 RPM isnt idle so i will asume your sitting in park reving it??
it could in that case be a slight misfire while the engine isnt under load which would mean you would barely notice it while driving.
there are thousands of reasons for a weak cyl have it checked out

 

[Mungus]

You're right, 2000rpm isn't idle but i never said it was! I've just had a service and tune, so it shouldn't be a misfire. Yeh i have got it in park, slowly increase revs and hold anywhere between 1400 and 1800 it is most noticeable. Can't notice it at all when driving or when in park at any other RPM. You're also right in saying it could be any one of a thousand reasons, i'm sort of hoping someone else has had the same issue and could give me a heads up, but it looks like it's back to the mechanic to have it checked out. $$$. Thanks for your reply calaisalltheway!

 

[calaisalltheway]

welcome mate, sorry i couldnt be of more help

 

[burnz]

:b: I have noticed a vibration from my engine when in park or neutral at around 2000-2200rpm. I wonder if anyone has had this before and can point me in the right direction to isolate the problem easily. All i can think of at the moment is things like; unbalanced crankshaft, harmonic balancer, sloppy piston; but really have no idea except i think it will be expensive to fix. :b:

check the harmonic balencer sometimes they break in halve where the front main seal is (easy to fix) so dont think "o"crap

 

[Mungus]

Thanks Burnz that's a starting point. Is removal required or can you see some telltale signs while it's still in place.

 

[burnz]

Thanks Burnz that's a starting point. Is removal required or can you see some telltale signs while it's still in place.

some times the centre bolt may need tigtening how ever if broken oil leak sometimes but not allways (to check 4 breakage loosen centre bolt and see if you can wobble the balancer if it wobbles its broke)

 

[Mungus]

Once again thanks Burnz. Will look into it and see how i go.

 

[myberlina]

I'm not a mechanic BUT couldn't it be faulty spark leads? Unless they were just changed?

 

[Mungus]

Just had a service and the leads (10.5mm) are only about 8mths old. Doesn't break down under load. I'm driving from Darwin to Cairns this week, fingers crossed the problem doesn't develop untill i get back in three weeks and then i'll look into it, starting with the harmonic balancer problem Burnz mentioned. Thanks for your thoughts though!