The dealer told me that it is normal as the car vibration on fuel pedal when in reverse, is it truth?

You may have engine mounts that defective or a grounded exhaust system causing the vibration. Before you do anything have a dealer look at this issue.

If the vibration is observed when the car is at rest, engine is running, brake pedal is depressed and is on D, check the following:
- Idle speed must be according to the specification.
- Vacuum leak.
- Spark plugs condition and air gaps between the electrodes.
- Fuel system and injectors.
- Engine and transmission mounts for looseness or are broken.
- Muffler and its foundations.

Put it in neutral when going 40 to 55 mph

If the noise goes away, you have a 75% chance your
going to rebuild the trans

what you need to do is flush the trans completely, put in new oil it should fix the problem. Change the transmission filter also, God-Bless and hope this helps you!

Time for new brake and resurface the brake rotor.

Mai

Motor mounts tight?

I assume you have a Regal or Century because those are the Buicks most noted for this problem. Replacing the bcm is very simple. It is a black box located just above the floor on the drivers side, to the left of the brake pedal. Problem is new bcms require programming by the dealer, at a cost somewhere in the 80 to 100 dollar range. I have also been told used bcms cannot be reprogrammed, so buying one from your local salvage yard is a waste of time and money. Understand I own a salvage yard, so I am problably telling the truth about this.

hello,good day,seem you have problem on ignition or fuel system,maybe one spark plug or nozzle need replacement,or better to send your car to a dealer for proper diagnose,ty

Dose the clutch pedal drive in gear 1" from the floor OR 1"" from the top when you let it out. if its drives when almost out and there is a vibration on the pedal then the clutch needs replacing and it has nothing to do with the gear box or oil
But the gearbox has to come out before you put a new complete clutch in

This may be caused by bad motor mounts. Lift your hood and then start the engine. Put it in reverse and hold the brake. Push on the gas peddle and watch the engine. If it trys to roll over they may be bad. Be careful.