2000 v6 3.8L

Got a vibration that goes in and out. Every stop light, sign, and in park. When i turn the car on, those first 5-10 minutes there is no vibration. Then the vibration starts to come in slowly after the 5-10 minutes.

I recently posted about the hard start but that's fixed. After that I erased the codes and no more Service Engine Soon. Gas mileage so much better. I'm guessing this might have to do with the suspension? Idk. If it had anything to do with the tune up I did, I would expect some kind of Check Engine but maybe not?

After all that was done I've changed the transmission fluid and got an alignment. It shifted good anyway but was time to change it. Alignments got the steering wheel straight as an arrow (wheel was moving too much to the right and caused me to steer to the left). A tire and oil place did it and said they did a suspension check.

So I'm not too sure what it could be. I'ma take it back to the shop soon but would like to get ideas on what it could be.

 

vibrates all the time or only when car is moving? what is vibrating? steering wheel, feet, butt,

 

Just when at stop signs, lights etc. When in a bit of motion it does vibrate still till I press on the gas.

I feel it more in my feet I guess? No steering wheel shakrs though

 

sounds like you may have a missing or missfiring cylinder. if you have changed plugs recently make sure you have the plug wires in the proper place. easy to get them crossed. also make sure they are connected right. also what is the idle rpms?

 

UhIdles at about 700rpm after warm up

Couple weeks ago noticed #2 was loose but I tightned it and made sure all plugs were tightley secured. Didn't fix it though.

Going through the wires on the plugs and noticed the plugs on the right side are all snug and fit on the same. The lefts a lil weird. #2 looks a lil off but think it's cause it's the first on the left so it makes it look like it, #4 feels snug like the right boots, and #6 is really snug. Think #6 maybe too snug idk.

1st pic is #2
2nd, #4
3rd, #6

Used the same firing order and starts up fine.

 

did you change the spark plugs?

 

Yeah a couple months ago. In March I think

 

ok, when the shaking is happening can you open the hood and see if the engine is vibrating, just want to make sure this is what it is. lol. it really sounds like a missing cylinder. plugged cat can do this too. how does the exhaust sound, has it gotten quiter lately, maybe making a hissing sorta sound.

 

probly better test fuel pressure when you can just to make sure fuel pump is working correctly. low or high fuel pressure can cause miss. should be able to borrow a tester from local parts store. and unfortunatly probly better have a look at the spark plugs and see if any of them are fouling or soaked in fuel.

 

The engine does follow the vibration. As it vibrates i see the engine kinda doing the same. Ill check some more in the morning.