1990 Acord Vibrating at idlee

I have a 1990 Accord 5spd that is vibrating when sitting at an
idle.When I step on the gas and increase from the idle (750 RPM) to
about 1000 RPM the vibrating stops. From what I have read, it sounds
like I might have a broken motor mount. I checked the motor mounts and
they all look ok Anyone have any Ideas. thanks Jim

 

Not exactly sure about a 90 with MT, but my 91 with AT supposedly had a
"hydraulic" MM.
At an idle, it "softens" to absorb vibration.
IIRC, It's the one toward the firewall???

 

It's problem on sensor. Like Idle sensor which forsees the conditions..
The sensor is a computerized like chip.

 

On the accords with automatic transmissions I see there is a vacuum
controled rear motor mount. Is that what you are talking about? It
looks like the one on the manual transmissions is just a dumb old
piece of rubber. Or maybe I am wrong

 

Your problem might have various causes. The car might not be getting enough
air, fuel or spark.
I've seen often a car which will stall when left at idle but runs ok when
you give it a little gas.
I think you should start with the essentials. How long has it been since the
follwoing were checked/replaced:
spark plugs
ignition cables
ditributor cap and rotor
air filter
fuel filter
etc?

 

I first started noticing the problem about a 6 months ago but it was
not as bad as it is now . I replace the spark plugs distributor cap
and rotor and air filer at that time and I didn,t see much of a
change. I just got use to the vibrating. Now it gets pretty bad. But
yes your right, The gas filter has 100,000 miles on it and the
ignition wres are the originals.

 

I told you it's sensor thing. I have the same problem. my car idlee
the mile gadge is abnormal only during the starting time. If I push the
gas, it goes away. So I do not have to worry about since it does not
affect on driving.