My car vibrates why is it doing that?

Question

I asked this same question before and said:
The problem is weird. The car vibrates when I am idle. Meaning when I am at a red light or stop sign. Sometimes when i am in idle, it doesn't vibrate. But at those times if I decide to turn on the A.C. it may start to do so. If I start the car and decide to put the power windows down while the car is at rest it will vibrate also. Sometimes when I am at a red light, if I put the car in neurtral the vibrating will stop but sometimes it keeps going. When the car is in park and I decide to give a tiny bit of gas to the car the vibrating may also stop. What do you suppose that the problem may be. I haven't been able to turn on my A.C. for a while because of the vibrating gets worse.

I have previously had motor mounts replaced, fuel filters cleaned, alternater belts changed, it still does so.

Answer 1

what's the make and model?

what year is it?

how many miles does it have on it?

how many cylinders?

Gas or diesel?

fuel injected or carburated?

automatic or manual transmission?

Answer 2

hi. i think you have two problems. first,check spark plug wires for loose or not installed properly. second, i would replace the idle speed control. or beter yet, have a diagnostic computer read out before doing anything. a read out might show the problem specially if that yellow/orange 'check engine' light came on. i strongly suggest a read out because there could be alot of parts to replace, of you dont, like the EGR valve, air intake manifold sensor, temp sender unit, 02 sensor, to name a few. not to mention fuel pressure. good luck.

Answer 3

Your car doesn't have enough ground. There are cables that run from the outside of the engine to the chasis. Probably someone took them off or they just don't work.
http://www.eautoworks.com/html/ape-auto~performance-Hyper~Ground~System.htm
try this website!

Answer 4

It may be idling too low or you may have a broken motor mount, or both.