I have a 1993 Chevy that still runs good but the front end and the dash starts vibrating everytime I pull up to a stop light and hold my foot on the brake. If I put it in nuetral, it stops vibrating.
I've had it to shop several times. It doesn't happen for them.
2006-10-26 15:05:25 · 7 answers · asked by Shotsie 7 in Cars & Transportation ➔ Maintenance & Repairs
Hmm, could be a couple of things. Since the vibration is noticed with the engine at idle speed and the transmission engaged, I would check how well tuned the motor is. You say that it doesn't happen when the trans is in neutral? Often there is enough play in the mounts that the engine may shake while idling, but not really be noticed while you are inside the vehicle. Pop the hood while the engine is idling, and see if it shakes or vibrates. Check the mounts as well while you're at it.
If it's purring smoothly, then you most likely have something wrong inside the transmission, most likely a problem with the torque converter or pump. Check the fluid level and go from there.
One thing to think about: for whatever reason the early 4.3 liter Vortec V6 motors in GM vehicles had a weird resonance shake at low speeds. I have a1989 GMC that does this, but it runs smoothly otherwise. The problem was solved on later models by the addition of a counterbalancer. If your vehicle has the TBI (VIN code Z motor) V6, this could be a problem. If it has the "CPI" fuel injection (also called the VIN code W motor), it has the counterbalancer and should idle smoothly.
2006-10-26 15:20:34 · answer #1 · answered by Vinny 4 · 0⤊ 0⤋
could be all of the above alone or in combination IE a tune up or vacuum issue can exploit bad motor mounts. Step one is to raise the hood with it running and have 1 person watch the engine while another goes from park to drive to reverse back to drive. If the engine flops about like a fish out of water start with motor mounts and go from there. if it does not jump very much then the mounts are most likely not an issue
2006-10-26 15:34:13 · answer #2 · answered by Fritz 3 · 0⤊ 0⤋
your idle is set too low.. when a car hits 500 to 600 rpms like when your at a red light in drive.. you feel the vibrations.. have the shop set your idle a little higher.. i have the computer to do it and i have to do mine 2 times a year
2006-10-26 16:18:26 · answer #3 · answered by dodgeforlife1982 2 · 0⤊ 0⤋
it could be worn out engine mounts. Engine mounts are usually made of rubber, and are what separates the engine from the body - if the engine mounts are gone, then the vibration will transfer to the car.
2006-10-26 15:14:01 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Sounds like rough idle. Highly likely that the vaccum lines are all dry-rotted and there's a vaccum leak somewhere. Also it is a good idea to disconnect the vaccum line going to the EGR valve and plug that vaccum line with a screw or small bolt. Good luck.
2006-10-26 15:15:54 · answer #5 · answered by jeff s 5 · 0⤊ 0⤋
that's "usually" a classic sign that the motor mounts are worn out. Especially on a car that old. It's a moderately inexpensive fix usually.
2006-10-26 15:15:02 · answer #6 · answered by remlap47 2 · 0⤊ 0⤋
All them answers ?? but-------why don't it vibrate when the "mechanic" drives it ?????
2006-10-26 16:51:09 · answer #7 · answered by tronary 7 · 0⤊ 0⤋