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EJ20 Engine bouncing...?


Eljaffacakeo

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Hey all, joined up to the forum to get some help with my GG EJ20. 

 

I have a slight issue when accelerating in that my car dies this weird sort of bounce thing. It's hard to describe, feels like I have super tight suspension going over corrugations slowly....but not that noticeable if you get me? It's not the drive train or anything like, it's the engine. While parked I revved it and the weird vibrations started around 2000rpm. There doesn't seem to be any loss of power at any point and there is no check engine light. The cam belt was done at 160k, the car just ticked over 200k. It's a 2000 2.0 manual. 

 

And ideas on where I should look? 

 

Thanks guys :D

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1 minute ago, Zeus said:

Worn engine mounts?

Could be, something I'll certainly check out. Certainly wasn't my first thought as the last time I had this issue (on  Commodore), the symptoms were totally different. I didn't notice that when driving, only idle. In the case of my Impreza, it's a bit lumpy on idle. 

 

When it does it, there is no issue with the revvs or the speed. 

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23 hours ago, pedro said:

Is the top pitch mount still in place ?

I'll look into that when the weather gets a bit better! 

 

To add to this, after driving up the highway today and noticed that at around 3000rpm there is an audible vibration that I can actually feel through the wheel, pedals and the gear stick (it's a manual). When I stopped I put it in neutral and revved to 3000 and it was there. It's not devastating but it's there. My guess would be that it's not drive train related as it's still there when parked and in neutral, could it still be engine mount related? 

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10 minutes ago, Loren said:

You already said it happens when the car isn't moving... check the engine mounts, transmission mount and pitch stopper.

It's both. The car has a strange shudder between 2 and 2.5k revs, then at 3k it's a vibration, the shudder is gone. 

 

I've just looked at the pitch mount, it actually looks fairly new (I bought the car in the last month), I'm not sure how much play it should have? 

 

I should also say that this is my first Subaru, are there any characteristics of the H shaped engine that perhaps I'm confusing this for? 

 

It's nothing carastrophic and it's only now that I've been driving it for a bit that I'm beginning to notice it. But with these things I would rather nip it in the bud, so to speak. 

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3 minutes ago, IZichard said:

If the engine mounts are all ok... are you sure it isn't just missfiring?

Was my original thought but there are no other indications of a misfire - no engine lights, no hesitations, no loss of power etc. Surely as a minimum I should be expecting a check engine light? 

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3 hours ago, Eljaffacakeo said:

Was my original thought but there are no other indications of a misfire - no engine lights, no hesitations, no loss of power etc. Surely as a minimum I should be expecting a check engine light? 

You most likely won't get a DTC for a misfire with your car.

 

Would probably pay to check all the plugs since people neglect them on Subarus.

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If it happens strongly during engine braking or reversing I'd suggest checking the rear diff outrigger bushes, and then the bushes between the rear diff and subframe.

It could be the driveshaft centre bearing carrier. These aren't serviceable (afaik) but a replacement from a wrecker shouldn't be too much.

Sent from my E5823 using Tapatalk

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