The engine in my 95 pickup started vibrating lately. I tried changing the
plugs, rotor, and distributor cap--but that didn't help. I only have 80k
miles on it. Otherwise, the truck runs fine.

I think this issue was discussed earlier, but I missed the possible fixes.

Can you post them again?

Thank you.

What kind of vibration? Is it similar to a defective spark plug?
something else?

The problem could be caused by:
Fuel injector
Compression Difference (valves, rings, etc.)
A/C Compressor or drive belts

Any recent repairs that could have caused the vibration to appear?

Good luck!

AS <donot@spamme.com> quipped:

possibly. But there are a myriad of things that can cause vibrations
in a vehicle. Anywhere from unbalanced drive shafts to
loose/faultily
motor mounts. Without a more accurate description of the vibration,
it's shooting in the dark.

For example, does the vehicle vibrate under acceleration? Under
deceleration? When turning left or right? At idle? In gear? Out of
gear? When moving? When not moving? When braking? Does it
vibrate if at speed and putting the transmission in neutral? Has
there been any other problems? Poor mileage? Uneven tire wear?
Excessive brake wear? Has the check engine light, either orange or
red been tripped recently? When was the last time the plugs were
changed? If recently, what color were the tips of the old plugs?

The list goes on and on.

I feel the vibration mainly when the engine is idling. I changed the plugs
recently and the old plugs showed no signs of oil on them. There is, I think
some tire unbalance, but that won't affect anything when the truck is not
moving.

The vibration seems to disappear when I'm driving and the vehicle seems to
drive normally.
I recently had a clutch kit installed as well as new transmission bearings.

"Nathan Schulman" <njs5@charter.net> quipped:


ok, that probably rules out driveshaft imbalance, brakes and tires as
I'm assuming that "idling" also means you're stationary.

Going on that assumption, there's only a few of things that could
cause a vibration:

1. Motor mounts
2. Fouled or faulty ignition system.
3. Fuel delivery system

He mentioned that he recently did the clutch, any motor mounts have to be
loosened to do that? perhaps they were not torqued to spec afterwards?

t


--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/nissan/200606/1

Is the truck auto or manual?

Is the vibration present when the car is in neutral/park?

It's a manual transmission and it vibrates when it is in neutral. I should
also say that the engine runs well. I think there is additional vibration
around 2,000 rpm. I don't think it's the ignition system because it
otherwise idles smoothly.