Truck shakes while stopped (Drive/Auto tranny)

So I got my truck a week or so ago, I really like it. The only thing I did notice with it is while I'm stopped at a traffic light, sometimes I notice the idle drops down to around 500-600rpms and I get a shaking in the cab (while in drive). I can feel it shaking my butt on the seat. Usually takes 10-15 seconds for it to do it, and then it goes away when I drive. Does not happen in park. Truck is an 02 4x4 with the 4 cylinder (automatic).

I was thinking of the possible causes:

1. Dirty MAF?
2. Exhaust hangers?
3. Torque converter?
4. It's nothing, I'm an idiot.

This may be normal, I'm not sure. I had a Tundra before this and sold her as gas was killing me in it. Still love my Yotas though.

Thanks in advance.

 

There are a multitude of threads on this.

I think it is a 4cyl auto Yota truck thing. I'd do a tune up w/ plugs. I've had mine a month and noticed the same thing. I just changed my plugs and noticed it was much better after warm up but still present while warming up. The RPM drop you mentioned is normal, although some members report higher RPMs at idle.

I noticed you said it was not present in park. This is pretty normal

Most cars w/auto I have experienced do vibrate to some degree while in drive, I have noticed more in inline 4 cyl., even our Honda CRV.

I would definately change the plugs with some Denso or NGK (most recommended here on the forum). I just went back with copper NGK since it was the factory spec.

Also run some injector cleaner

As a kind of disclaimer. This is my experience, I can't observe your truck so a second (and qualified) opinion or some searching here might help further.

 

I tried searching. I noticed a couple other dudes with similar issues. It may be nothing, I just like to ensure whatever I own is 100%.

I'll change the plugs on it. What do I need to do with the injector cleaner exactly? GAP on plugs should be what?

Thanks!

 

Check your battery connection sometimes mine will do that a shutter then shut off until i replace the +,- wires on the battery and fixed the problem

 

I'll check that, thanks. Anymore?

 

My 04 .v6 has a give while in drive with my foot on the brake like at a stop light. I think its a worn motor mount issue.

 

How bad is it to replace the motor mounts in them? Is there a writeup somewhere?

 

my truck does this while at an idle also, it goes away when the rpms jump up a little but when they settle to 600-700 it starts again, i can feel it shaking everytime i stop at a light. after trying to diagnose it for years i have finally accepted it but i still would like to find it, i was thinking it could be a motor mount but none of mine look cracked (that i can see bc they are kind of dirty) or a vacuum/exhause leak somewhere that i cant find

 

I don't think it's a motor mount issue. I may change the plugs, and get the oil changed as well.

Mine does that, RPMs hit about 500-600rpms and she starts shaking, they jump back up a hundred or so and it's fine.

 

i changed the oil, transmission fluid, plugs, differential oil, cleaned mass air flow sensor and throttle body, seafoamed through break booster and gas tank...no luck BUT im pretty sure its a vacuum issue now because today i noticed a small leak in the back of the throttle body where is connects to the intake manifold. put some gasket sealer on it and it stopped the leak and reduced the vibration by 50%...its much more tollerable, as of now....i dont see any lines disconnected and i have checked multiple times but i am much happier with it if it stays like it is, now i dont see everything in the truck shaking, including me

 

When the idle drops down does you truck make a thumping sound when it is under a load?( in drive and ac compressor on)

 

Do you have an egr valve? Sometimes a vacuum line will get plugged up with crap and cause rough idle

 

Where would that be located?