Vacuum Line On A Motor Mount??... - Honda-Tech - Honda Forum Discussion

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Vacuum Line On A Motor Mount??...

Old 06-07-2011, 08:12 PM
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Default Vacuum Line On A Motor Mount??...

Can someone please explain to me why there is a vacuum line connected to the front motor mount on my 2002 Accord Coupe?...
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Old 06-07-2011, 08:26 PM
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Default Re: Vacuum Line On A Motor Mount??...

Sure, it's a vacuum actuated solenoid that enables vibration dampening dependent on the engines load/vacuum levels.
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Old 06-07-2011, 09:33 PM
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Default Re: Vacuum Line On A Motor Mount??...

Wiki has a decent explanation of this on the Honda Accord page..

TRUST me on this, you want that line vac hose connected.. I couldnt get the correct mount for my car for a year or so and without the vaccum mount (same design, just no vac) the idle vibration was ridiculous.. To the point where you half expected the dash to fall apart.. Once you touched the gas the idle vibration went away
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Old 06-08-2011, 09:54 AM
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Default Re: Vacuum Line On A Motor Mount??...

The automatic transmission mounts are vacuum-actuate hydraulic mounts. The motor mounts are filled with a fluid. There is a valve that controls this fluid actuated by engine vacuum. It opens and closes to adjust the stiffness of the mount when idleing for a smoother idle.
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Old 06-08-2011, 11:35 AM
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Default Re: Vacuum Line On A Motor Mount??...

For automatics only; none for the manual version!
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Old 07-08-2015, 08:16 PM
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Default Re: Vacuum Line On A Motor Mount??...

not trying to bring the dead horse back to life but can these mounts be adopted to other cars like integra or civic with built motors that are daily driven?
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Old 07-08-2015, 08:22 PM
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Default Re: Vacuum Line On A Motor Mount??...

If you are running a 'built' motor, then most likely you are running an MT transmission.
Purpose of the hydro mount is to allow the engine to 'float' while in gear and not loaded, ie at a stop while in gear(automatic). This reduces/removes the engine vibrations induced through the mounts. When the car begins to accelerate the mount is 'solidified' to transfer power. They are for comfort, not to offset a lopey idle.
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Old 07-08-2015, 08:50 PM
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Default Re: Vacuum Line On A Motor Mount??...

yea I still want comfort in my daily I don't want to rattle the passengers out the window.
and stock mounts wont do the trick and slid mounts rattle too much.

I was just wondering. how much accessories does it carry with it. it would be cool to retain the quiet ride with a bit more support when accelerating
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Old 07-09-2015, 09:59 AM
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Default Re: Vacuum Line On A Motor Mount??...

Originally Posted by raverx3m View Post
I was just wondering. how much accessories does it carry with it.
Mount is controlled via a vacuum solenoid, which is controlled via the ECM/PCM.

Originally Posted by raverx3m View Post
it would be cool to retain the quiet ride with a bit more support when accelerating
You're not picking up what I'm laying down.

Vacuum controlled hydro mounts are for the purpose of idle comfort with the car in gear and no load/acceleration(stopped in gear).
Once the car begins to accelerate, the computer will command the solenoid to operate which then changes the mount from a fluid/hydro mount to stiffen it up.
It is only used on AT cars and the function is purely for comfort with the car in gear and under no load.

If your car shakes now with the engine on and transmission in Neutral, then there is a problem elsewhere. Either the engine has a very lopey idle, you may not be able to fully isolate the engine, or you have a broken/damaged mount.

On Accords the Left(engine) mount is a hydro mount, the right(trans) mount is a rubber mount, front mount(called a 'stopper', a limiter not a 'mount' per-se) is a damper, and the rear mount(depending on application) is either solid rubber(MT) or a rubber/hydromount combination(AT).

Rear hydro mount is fairly large as well, not the small insert that the Civic/Integras have.
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Old 11-14-2017, 07:17 PM
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Default Re: Vacuum Line On A Motor Mount??...

I found a disconnected vacuum hose from what looks to be the transmission mount (the mount to the left side of the engine bay as im standing over).

Where the heck is this thing supposed to go? I do not see any obvious places...
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Old 11-14-2017, 08:57 PM
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Default Re: Vacuum Line On A Motor Mount??...

if you have a cold air intake it could be for the air intake solenoid that's not being used anymore
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Old 11-15-2017, 12:43 AM
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Default Re: Vacuum Line On A Motor Mount??...

On Automatic Transmission Accords, there is a vent line that is under the trans mount, there is usually a hose that attaches to it, it leads from the vent to atmosphere. It does not go to a physical place it is just a vent. Do not connect it or plug it to anything.

A year and engine/trans would help in better identifying what you have.
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Old 11-15-2017, 05:40 AM
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Default Re: Vacuum Line On A Motor Mount??...

Thanks guys! Its a 00' accord 2.3L and the transmission is the BAXA. Trying to chase down a clunk. So far I have identified a cracked front engine mount bushing.
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Old 11-15-2017, 08:04 AM
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Default Re: Vacuum Line On A Motor Mount??...

The vacuum hose on the engine mount goes to the engine mount control solenoid valve.

The engine mount hose is different than the transmission vent tube.
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