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import racer
07-02-2009, 04:02 PM
Anyone know what would cause a vibration when car warms up.when it's on fast idle it's fine,but when it idles down to 750 it vibrates.what would cause this .
Joay
07-02-2009, 05:54 PM
Worn motor mounts.
import racer
07-03-2009, 01:12 PM
Well when i get the motor and trans out of black car gonna take the mounts and fill them with urethane,that should help.
Civic Accord Honda
07-03-2009, 01:22 PM
the 91 vibrates alot at idle and shudders as well.. still havent figgured that one out.. engine mounts seem fine and the front one is filled
ecogabriel
07-17-2009, 04:52 PM
I read somewhere on the net that 91 (4g) have the rear engine mount actuated by the ECU; it shifts the mount from "soft" to "hard".... Other people complained about idle vibration in 4g accords and were told to look at the rear engine mount (that is ecu-controlled)...

As for 3g, mine (86 LXI auto) has the same problem. Fast idle is OK, but vibrates at idle especially when transmission is in gear (D,2 or R) or A/C is on. when both are together (gear + AC) it is a low-frequency rumble that invades the whole car.
I replaced motor mounts (one was destroyed -timing belt side; front and rear were OK) I also replaced bushings at the torque arm or whatever its name (engine top)... vibration is still there.
jasonrebellion
07-18-2009, 01:17 AM
yeah mine seems like its fighting it when its in drive and im stopped......take it out of gear and its gone
ecogabriel
07-18-2009, 12:52 PM
yeah mine seems like its fighting it when its in drive and im stopped......take it out of gear and its gone

manual or auto trans?
import racer
07-18-2009, 03:38 PM
It's auto but i will be changing to 5-speed later.
ecogabriel
07-19-2009, 10:57 AM
It's auto but i will be changing to 5-speed later.

mine is auto too.

I read the service manual and said check idle speed, check motor mounts, check transmission for debris in pump filter, replace torque converter. Someone suggested me that a partially stuck lock converter valve would cause this by partially engaging the lock in the torque converter. But since checking for stuck valves involves disassembling the transmission... I think I'll learn to love the vibration :beer:
Dr_Snooz
07-19-2009, 12:40 PM
EGR problems can mess with your idle too.
1987AccordLx-i
07-19-2009, 11:25 PM
EGR problems can mess with your idle too.

would it cause idle to drop to about 500 then back up to 700? mine does that
jasonrebellion
07-20-2009, 11:17 AM
manual or auto trans?

mine's an auto
Dr_Snooz
07-20-2009, 07:47 PM
would it cause idle to drop to about 500 then back up to 700? mine does that

Don't know. I think the gasket is a couple bucks so just pull it off and see if it's dirty.
1987AccordLx-i
07-22-2009, 11:27 AM
Don't know. I think the gasket is a couple bucks so just pull it off and see if it's dirty.

sweet.. thanks doc