vibration problem - Toyota Nation Forum : Toyota Car and Truck Forums

RobMilkshakes · 06-21-2009, 12:39 PM

Ok, I know this is technically in the wrong section but every celica forum I've been to(including the one here in TN) does not have nearly the support that this thread alone does and I honestly miss that. Also, this is mostly a general issue, not very car specific but sorry anyway. Well, I bought a 92 celica gt about a month back that had a few issues most by now are fixed(radiator, CV axle, power steering leak) but one very troubling issue remains, the awful vibration.

Upon startup, the vibration is at its worst and goes away some after the car has warmed up a bit but is still very noticable. It has to be something engine related(not like wheel out of balance, tie rod, something like that) because it vibrates while sitting in one spot. It does while moving as well and it increases with the revs. Also, it does while the clutch is disengaged and moving and with it engaged and the engine reving. After running about ten or so minutes at idle you dont seem to feel it anymore. but as soon as you rev the engine you feel it. Its felt throughout the car, in your seat, steering wheel, even in the body.

that being said, any ideas? I have replaced the harmonic balancer and I know the clutch needs to be replaced, it slips(not awful yet but still). When I went for a vehicle safty inspection, I failed for a few things but one was a loose lower front motor mount which I tightened later that day. so could it still be the mounts, or maybe have something to do with the clutch/flywheel (both of which will soon be replaced, I already have both parts. But any suggestions/help will be greatly appreciated.

thanks,
Rob.

j2b4osan · 06-21-2009, 04:19 PM

a misfire will give you a shake. so will bad mounts. but hard to be sure without seeing it

RobMilkshakes · 06-21-2009, 05:12 PM

yeah I know it would be hard. Its not a misfire, the engine is running fine and I know what a misfire feels like. I always bring up the mounts but everybody dismisses the idea because I hear no clunk.

thanks for the response!

j2b4osan · 06-21-2009, 05:54 PM

do you see the engine shimmy with the hood open?? if so my vote goes for mounts.

RobMilkshakes · 06-21-2009, 07:05 PM

you can see it moving back and forth slightly so probably yeahh

RobMilkshakes · 07-17-2009, 07:34 PM

so as an update to a dead thread: clutch has been replaced as well as both the front and rear engine mounts and the vibration is perhaps worse...

So maybe its the side mounts, sucks that it'll cost at least $180 to get the mounts.

The vibration does feel slightly different now, a tighter vibration, if that makes any sense at all? I'm thinking since the other mounts that I replaced are now stiffer its causing the vibrations to really come through one(or both) of the side mounts

I'm so tired of this.

89corolla4wd · 07-17-2009, 10:25 PM

If you replace the mounts and it is still doing it the engine is probably the culprit. Since mounts only isolate the movement and vibration from the engine but they dont really generate vibrations themselves. Just some ideas.. You could try to check for ignition timing, fuel pressure or even cam timing(t-belt jump), compression test.

TonkaTom · 07-17-2009, 10:55 PM

Make sure the mounts have all of their bolts in them. Does the noise change in pitch as the revs/speed change?

RobMilkshakes · 07-17-2009, 11:27 PM

there is really no noise associated with the vibration except some interior panels rattling about. and the vibration increases with rpm equally.

the engine is running great actually so I dont suspect any engine issues, the vibration did seem to improve after the clutch was replaced for some some but when I replaced the front mount it seemed to come back with a vengence. Now I've replaced the rear and its still very noticable. I still have the other two mounts, I'll probably pull them and inspet them but its just very frustrating in the mean time.

I may still look into the fuel possibility, I'm not getting the best fuel milage but I think its a long shot.

RobMilkshakes · 07-25-2009, 07:13 PM

well replaced the other two mounts, it wasn't until the last mount went in the vibration stopped. It feels like a brand new car even with 150,000 on it. you cant feel anything

Sorry again that this is in the wrong section.

teamyoda · 07-25-2009, 09:01 PM

Quote:

Originally Posted by 89corolla4wd

If you replace the mounts and it is still doing it the engine is probably the culprit. Since mounts only isolate the movement and vibration from the engine but they dont really generate vibrations themselves. Just some ideas.. You could try to check for ignition timing, fuel pressure or even cam timing(t-belt jump), compression test.

I agree with 89corolla. I just recently did a timing belt on my friends 92 and I had to PULL out one of the motor mounts as the timing belt goes around it. before I put the motor mount back in, I started the car with only one mount installed (there's 2 mounts for the motor) not including trans. I started the car running off one mount and everything ran fine. no vibration no nothing. I didn't want to put everything back together until I found out i installed the belt correctly. so I highly doubt that the motor mount is causing this vibration. I would check the timing, plugs, igniter, I coil, check all vaccuum lines, egr valve ect. just like he said, you might have jumped a tooth on the timing belt. It happened to my friend the other day. the only way you can really find that out is to just reset the timing by changing the belt and alighning all the pulleys and knock pins on the cam sprocket. and making sure that the no one cyl is at tdc when you do all this. you can usually make sure by pulling a plug and putting a screw driver down in it and when it comes up to the top, you know you're at tdc. hope this helps.

Donald · 07-26-2009, 05:05 PM

Quote:

Originally Posted by RobMilkshakes

well replaced the other two mounts, it wasn't until the last mount went in the vibration stopped. It feels like a brand new car even with 150,000 on it. you cant feel anything

Sorry again that this is in the wrong section.

Which mount was the culprit?

RobMilkshakes · 07-26-2009, 06:27 PM

I think it was mainly the passenger side mount (the one that connects to the front on the engine). But The others were very broken down so I think replacing just that one would have still left me with a vibration. I think that when I changed the others the vibrations were just kind of transferred into the other mount and felt through that.