FJ Cruisers of Northern California

engine shake/vibration

While driving my FJ (at any particular speed) I'm noticing that when I have the accelerator slightly depressed I'm feeling a vibration that seems to be coming from the motor. Once I let off or give it more gas it stops. Anyone know what this could possibly be? I'm also only averaging 13-14 mpg highway at the moment and I'm thinking that whatever vibration I'm feeling may be playing some part in that. Air cleaner is clean, spark plugs changed in june, and tire pressure is good.

Thanks,

Daniel

▶ Reply to This

Replies to This Discussion

Permalink Reply by Cowboy on October 6, 2011 at 3:55pm

Go start your truck and pop your hood. Check to see if there is any oscilation in the drive belt around any of the pulleys. I had a bad pulley/shaft on my alternator and it was causing the belt to oscilate bad. When it was happening, there was a very unsettling vibration I could feel.

Just something to check.

▶ Reply

Permalink Reply by Daniel May on October 7, 2011 at 8:56am

I checked for oscilation and everything looks good.

▶ Reply

Permalink Reply by Cowboy on October 6, 2011 at 3:57pm

Maybe run some fuel injector cleaner in your next tank of gas. (addressing lower mpg's)

▶ Reply

Permalink Reply by Bz on October 7, 2011 at 11:13am

how many miles are on it?

▶ Reply

Permalink Reply by Daniel May on October 10, 2011 at 12:06am

62,xxx

▶ Reply

Permalink Reply by Bz on October 10, 2011 at 10:34am

change out your spark plugs yet?

▶ Reply

Permalink Reply by Daniel May on October 19, 2011 at 1:20pm

I changed them about 10k miles ago... Denso iridium plugs

▶ Reply

Permalink Reply by daPitbull on October 8, 2011 at 10:24am

Check for cracks at the engine mounts. Its been known to happen.

▶ Reply

Permalink Reply by Bz on October 10, 2011 at 10:33am

yup it happened to me and a few others

▶ Reply

Permalink Reply by Daniel May on October 19, 2011 at 1:23pm

So im noticing that it happens when it's in the highest gear (I have a automatic tranny) mostly between 40-50mph but sometimes slower, with the gas pedal only slightly depressed... It's kinda weird

▶ Reply

Permalink Reply by Ranger Jim on October 19, 2011 at 5:35pm

It's the transmission, I would guess it is doing it when the vehicle shifts between 3-4 and 4-5. Mine is doing the same thing. It happens when your just going really easy, it has been spoken about over on FjCruiserforums. It has been cured by doing a complete tranny flush,or a new converter, and also a complete transmission replacement. Im trying to get mine done before my extended warranty runs out. Mine feels like I'm driving on a bumpy road when it happens. Good luck

Ranger Jim

▶ Reply

Permalink Reply by Daniel May on October 19, 2011 at 5:45pm

Thats exactly the feeling. I don't wanna have to replace my tranny since my warranty is out.... Seems like the tranny is shifting fine, just the shaking is a very uneasy feeling. Maybe I'll try the tranny flush! How long has yours been doing this for? Did you try the tranny flush?