I have a 1994 honda acccord.

Sometimes when i stop my car, starts to rumble. I think i;ve pinpointed the fault to mostly the a/c.

I noticed that if i have my a/c on my car rumbles more then usual. when i turn it off it stops the rumbling.

Is this a sign for a tuneup or what?

 

when you turn on your a/c, you turn on the compressor for the a/c.it is normal for it to "rumble" a little bit.

 

my 1998 honda accord ex does this tooo ??idk y

 

my car also rumbles when i stop, but i change to a thinner grade of oil, still stay with a mineral type, and it help the car idle alot smoother. a synthetic may help even more...

 

its rumble more then what other cars are at when their a/c is. Do i need a tune up?

 

I'm guessing that the 'rumbling' you're hearing is the sound of your car idling a bit lower than usual. This is caused by the AC putting an extra load on the engine...totally normal and nothing to worry about.

Check it out, if thats not the case, you may have something to worry about.

 

How would i go about checking.

Because my friend has the same car and his car doesnt make the sane annoying rumbling sound. My car sounds like its old. Sometimes when i reverse it rumbles a lot.

 

Once the car's warmed up, let it idle with the A/C off, look at the tach and notice where the RPMs are. Then turn on the A/C and see if the RPMs drop at all. They probably will and it will probably go pretty low (less thank 1k).

 

Maybe you do have an issue with something rumbling and when you turn on the A/C, it become louder because of the added stress on the engine from the load of the A/C.
I do not think you are describing the sound correctly for us. Does it sound like its comming from inside the engine? or does it sound like it could be something along the muffler pipe vibrating?

 

sounds is coming from under the hood. Sometimes when i try pushing the hood down it reduces a bit of the sound.

Its most noticeable when i first start up my car and go in reverse. I can feel the steering wheel rumble and shake.

 

Ahh, you might be looking at a bad motor mount.

 

check them mounts man.

 

how do i check, i really dont know much about cars.