Rough Idle With A/C on
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Joined: Apr 2012
Posts: 76
Rough Idle With A/C on
I just fixed my ac and recharged it on my 1991 Honda Accord. Now with the ac on the idle is rough, but if I raise the idle to 1000 it clears up and runs smooth. But at idle at 850, it makes a drone vibration noise that shakes the whole car. I have cleaned the IACV, and throttle plate before, and changed spark plugs, cap, rotor, and cleaned air filter.
Is this normal, or is it a issue that I should resolve.
The car has 176,000 miles but the compressor has 80,000.
Is this normal, or is it a issue that I should resolve.
The car has 176,000 miles but the compressor has 80,000.
Super Moderator : And A Texan
Joined: Feb 2007
Posts: 9,652
From: Katy, TX
You may have damaged front and/or rear motor mounts. This leads to idle vibration also.
Inspect (carefully) by helper putting auto in park, setting e-brake, and holding brake w/ foot. Pull trans into D and spike accelerate to 1500-2500 rpm. Standing to one side of car inspect the front and rear motor mounts. Front is easy to see, but rear will require good light and look beneath the throttle body.
Repeat inspection w/ trans in reverse. This causes rear motor mount to lift and may expose damaged rubber. This was the case for my 94Ex.
good luck
Inspect (carefully) by helper putting auto in park, setting e-brake, and holding brake w/ foot. Pull trans into D and spike accelerate to 1500-2500 rpm. Standing to one side of car inspect the front and rear motor mounts. Front is easy to see, but rear will require good light and look beneath the throttle body.
Repeat inspection w/ trans in reverse. This causes rear motor mount to lift and may expose damaged rubber. This was the case for my 94Ex.
good luck
Super Moderator
Joined: Oct 2010
Posts: 7,099
From: United States
It probably is related to the motor mounts. More specifically, the rear motor mount. The 4th generation Accord (90-93) with automatic transmission had electronically controlled vacuum assisted rear engine mounts.
It can be a faulty rear engine mount or a problem with the vacuum diaphragm actuator control linkage. See attached pic. of vacuum diaphragm actuator and the linkage to the motor mount.
How the engine mount control system works:
"Power is supplied to the engine mount control unit
and the engine mount control solenoid valve with the
ignition switch in run or start. The control unit receives
the engine rpm signal from the igniter unit.
When the engine is running below 850 rpm, a signal
is sent to the solenoid valve, and it opens."
A lot of work to replace rear engine mount if the mount is faulty. See Honda technical service bulletin:
http://www.driveaccord.net/forums/at...9&d=1224269227
It can be a faulty rear engine mount or a problem with the vacuum diaphragm actuator control linkage. See attached pic. of vacuum diaphragm actuator and the linkage to the motor mount.
How the engine mount control system works:
"Power is supplied to the engine mount control unit
and the engine mount control solenoid valve with the
ignition switch in run or start. The control unit receives
the engine rpm signal from the igniter unit.
When the engine is running below 850 rpm, a signal
is sent to the solenoid valve, and it opens."
A lot of work to replace rear engine mount if the mount is faulty. See Honda technical service bulletin:
http://www.driveaccord.net/forums/at...9&d=1224269227
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