2000 R.P.M Vibration

[dallas]

I don't know if its my Megan muffler but at around 2000 rpm while car is stationary it feels like there is a engine miss and I can feel vibration through the seat, as the rpm increases it goes away around 2800 rpm. Has anyone else tried reving the engine at a stop and noticed the vibration/miss at 2000 rpm? Could the valve timing have anything to do with this ? Any help would be appreciated. I dont have anyone around to check as the engine mounts flex under load if the exhaust makes contact with the body, which would make the same vibration through the seat and chassis.

[Tamago]

if your car is actually misfiring, you'll throw a CEL

[SailDesign]

if your car is actually misfiring, you'll throw a CEL

Which begs the question of why you would want, on a regular-enough basis to worry about it, to rev the car to 2-grand while static.... :smile:

[Tamago]

Which begs the question of why you would want, on a regular-enough basis to worry about it, to rev the car to 2-grand while static.... :smile:

revving at stop lights to hear the ricer exhaust?



peterpoop, yes?

[SailDesign]

revving at stop lights to hear the ricer exhaust?

Judge not, lest ye be judged. But Yeah, I'm with you on that one...

:biggrin:

[Tamago]

Judge not, lest ye be judged. But Yeah, I'm with you on that one...

:biggrin:

i'm the first to admit that my exhaust is horrible :) it's fun to poke fun at someone who can't take it well though :D

[SailDesign]

i'm the first to admit that my exhaust is horrible :) it's fun to poke fun at someone who can't take it well though :D

:thumbup:

[yaris-me]

Try running injector cleaner in your gas. I had an 80's Corolla that would run rough at certain RPMs and the injector cleaner would clear it up.:thumbsup:

Use the good stuff. The cheap stuff is just that, cheap stuff.

[dallas]

To answer your questions, if you have a keen eye for how your engine runs it can save you lots of money in the long run. Most people would not even notice the miss but over time it will take it's toll on the engine.
Not all misses are caught by the ecu, I used to see a lot oiled guaze filters suck oil upstream and coat the MAF, then there would be uneven running and no codes thrown. I have a AEM with a dry flow filter so theres no oil there but I may have dust or debris somewhere. I checked to make sure the muffler and exhaust is not rubbing under the car under load and it is not, I think I will take apart the intake and clean the components and see what happens.
Thanks for the suggestion of the Fuel system treatment :thumbup:, if you have moisture in the fuel you can have rough running and again no codes thrown, I put in a premium German made, TUV approved product I distribute that has a water remover included, as the vehicle has been parked all winter. I still have the miss. If anyone has the AEM intake please check for 2000 rpm hesitation. I will keep you posted what the problem is.

[jkuchta]

It might just be a harmonic vibration that you otherwise would not notice while running through 2k rpm. I notice a little bit of a burble at 2 grand, but nothing serious. Also, if it were a miss, I would think that it would appear in a more general band of RPM's (Say lower rev band or higher revband), but not at a specific rpm.

[Lafiro]

I get the same tremble around 1900rpm. Been there since I first got the car new years ago. I don't think its a problem, well according to themaster tech at toyota its not. Yet I can not believe them most of the time since they are only after money.

[ham]

quit buying junk AEM and buy a good quality intake like injen

[AlexNet0]

^.. lol?

[dallas]

Thanks for the feedback on other cars that have a harmonic vibration at 2000 rpm. Yes harmonic vibration is better terminology to a miss. At 2000 rpm you can actually feel it in the seat.

[Lafiro]

My cars close to 48,000miles now. I tried doing that today and it would not vibrate around 2000rpm. Maybe because the car was cold? Who knows, I dont worry about it anymore.

[ka0sx]

with a miss I would be more worried about the cat. however i would doubt it being a miss, as tamago mentioned it would throw a CEL for that. Most likely it would be something that revs with the engine, pulleys, balancer. How bad is the vibration? it could be the reverberations through the muffler as well as it is a diff freq then the stock reverb.

[dallas]

Tommorow I will clean out the TB and intake, if that does not fix it I will remove the Megan exhaust, if that does not work I will remove the AEM and put on the stock air box, Good tip on the pulleys, I will also look for play in the water pump, Pulleys etc. I will keep you posted.
Thanks for your suggestions:thumbup:

[jkuchta]

Just don't over-tighten the belt, as that could kill the water pump shaft seal.

[dallas]

Well I found the MAF safe cleaner from CRC and I cleaned the throttle body there was a build up of dust etc at the butterfly, it seems to run a bit smoother with better response. I still have the harmonic vibration at 2000 rpm, I ran out of time to pull the muffler but that will be next, if that fails I will look at the h20 pump and belt tensioners etc, Thanks for the belt tension tip.

[Lafiro]

I take my comment back. I do still ahve this vibration.

Open your door, hold it with one hand, and start revving your engine slowly, and you will feel the whole car shake around 1700-2000rpm.

I dont know, more like the car vibrates with the vibration of the car, no way around that? Maybe just cheap engine mounts?

[dallas]

Yah your right mine comes in a bit later around 2000-2600 rpm I bet if more people tried it they may be suprized to find how much harmonic vibration it is.

[ka0sx]

I havn't felt anything of the sort. *shrug*

[Shroomster]

IIRC there are two total mounts...one tranny side and one motor side?

ergo there will be more vibration than you can bargain for, from say a lexus...


get a torque damper/ motor mount stiffy...

[SailDesign]

Yah your right mine comes in a bit later around 2000-2600 rpm I bet if more people tried it they may be suprized to find how much harmonic vibration it is.

As I have said before, all of this begs the question of WHY you would worry about this vibration that only happens when the engine is unloaded. I have never, ever felt this when driving, which is the only time my engine ever gets to that rev range. So I don't (and won't) worry about it. :biggrin:

[dallas]

When I'm at the Autocross at 6500 rpm I really don't want it to blow up, thats why I want to get rid of any harmonic vibrations especially ones big enough to feel in the seat of the car, under no load. I still have not had time to remove the aftermarket muffler to see if thats all it is, now go sail away :wink:

[SailDesign]

When I'm at the Autocross at 6500 rpm I really don't want it to blow up, thats why I want to get rid of any harmonic vibrations especially ones big enough to feel in the seat of the car, under no load. I still have not had time to remove the aftermarket muffler to see if thats all it is, now go sail away :wink:

Yubbut - y'see - it's the "no load" thing that bugs me, since the engine will behave very differently at load to how it behaves without load. It is entirely possible that there is NO vibration induced under load. By repeatedly running the engine to high no-load rpms, you may in fact be damaging the little beast.
That's my point...

So I'll go sail away - blow it up if you want.

[SailDesign]

bump

:tongue:

[dallas]

LOL, if there is harmonic vibration under no load, there can be more damage done under load without knowing it because it's under laod, for example if there is harmonic vibration is due to a unbalaced crank pulley under load the main bearings could wear uneavenly. Maybe I'm picky, but I really want to isolate where the problem is, if not I'll maybe I can blow it up for you:biggrin:

[jkuchta]

Don't fotget this is an inline 4, which is inherantly unbalanced. A compromise is made as far as the harmonics are concerned to make the engine as smooth as possible at cruise rpm, while transiant harmonics are mitigated as much as possible through component weights (i.e. a heavy crank will have resonant frequencies than a lighter one).

Also, the stock crank pully is heavy for a reason. When I installed the 10% underdrive pulley I noticed an overall increase in vibrations, but everything smooth's out above 2K rpms.

[yaris-me]

You might be able isolate it better:
http://www.yarisworld.com/forums/showthread.php?t=11905

:smile:

[dallas]

Good info !

Don't fotget this is an inline 4, which is inherantly unbalanced. A compromise is made as far as the harmonics are concerned to make the engine as smooth as possible at cruise rpm, while transiant harmonics are mitigated as much as possible through component weights (i.e. a heavy crank will have resonant frequencies than a lighter one).

Also, the stock crank pully is heavy for a reason. When I installed the 10% underdrive pulley I noticed an overall increase in vibrations, but everything smooth's out above 2K rpms.

[dallas]

I did this on my last car made hard launches much smoother and fast shifting better, but a lot more vibration entered the cabin.

You might be able isolate it better:
http://www.yarisworld.com/forums/showthread.php?t=11905

:smile:

[Yaris Hilton]

i'm the first to admit that my exhaust is horrible :) it's fun to poke fun at someone who can't take it well though :D

Is that your personal exhaust, or your Scion's?

[Cartel]

what a bunch of off-topic nonsense in this thread.
my car has this vibration at 2000rpm too.
feels like someone pulls a plug wire (exaggerating) at 2000....

googling brought me here
mines a bit shaky at idle too

[invalid username]

My Yaris with 1NZ-FE also has the vibration at 2000 RPM (if revved with no load). Since there are other people in here whose cars have the same vibration at the same RPM, then I guess it is just a characteristic of this engine. So, I'm not going to worry about it.

[removebeforeflight1994]

Hello

i have 2012 Yaris 1KR-FE 3 cylinder and i have the same problem around 1400-1500rpm. 1400 + below and 1600 + above are totally pure..

4 cylinders modal is vibrating in 2000RPM and 3 cylinders (mine) is in 1500.. seems it is the same issue

Does anyone help or already solved what can cause it ?