What does a bad motor mount feel like?
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Rookie
Joined: Jun 2010
Posts: 62
Likes: 1
From: Vancouver, BC, Canada
What does a bad motor mount feel like?
I have a what I thouhgt was a miss at idle, but I am now wondering if it could be a bad motor/engine mount.
I have some steady, almost loping vibration, and I will randomly get a slightly more violent shake. This happens when in gear idling (sitting at a light). Also, the severity and frequency of the miss and loping change intermittently (randomly).
This happens warm or cold.
Things done to date:
-timing chain
-tune up (plugs, cap, rotor)
-ignition coil
-all lifters (had one that would not pump oil)
-Plenum gasket
-up stream O2 sensor
-TSB plug wire routing
-Cleaned throttle body and IAC (removed, on bench)
-Replaced Fuel Injector O-rings (had vacuum leak)
What does a bad motor mount feel like?
I did some searching and found the best way to test a bad a motor mount is to have someone put it in gear, step on the brake, and give it a bit of gas (to load the driveline), then to watch the motor and motor mount for movement. Is there a better way to test a motor mount?
Is it common on these trucks for motor mounts to go bad?
My truck is a 2001, 2500, 5.9L gas, 46RE (auto), 170000 km. I believe the previous owner used to tow a horse trailer on the highway.
Thanks,
Chris
I have some steady, almost loping vibration, and I will randomly get a slightly more violent shake. This happens when in gear idling (sitting at a light). Also, the severity and frequency of the miss and loping change intermittently (randomly).
This happens warm or cold.
Things done to date:
-timing chain
-tune up (plugs, cap, rotor)
-ignition coil
-all lifters (had one that would not pump oil)
-Plenum gasket
-up stream O2 sensor
-TSB plug wire routing
-Cleaned throttle body and IAC (removed, on bench)
-Replaced Fuel Injector O-rings (had vacuum leak)
What does a bad motor mount feel like?
I did some searching and found the best way to test a bad a motor mount is to have someone put it in gear, step on the brake, and give it a bit of gas (to load the driveline), then to watch the motor and motor mount for movement. Is there a better way to test a motor mount?
Is it common on these trucks for motor mounts to go bad?
My truck is a 2001, 2500, 5.9L gas, 46RE (auto), 170000 km. I believe the previous owner used to tow a horse trailer on the highway.
Thanks,
Chris
Veteran
Joined: Oct 2010
Posts: 251
Likes: 0
From: Beaverton, OR
If an engine is running smooth, you shouldn't get any motor mount movement at idle.
Doing the rev test with the brake on is good. Also you can jam a prybar where you can move the engine and watch the mount. A real wasted motor mount will be visibly broken. Also, if you've had an oil leak onto a mount (like the trans mount) for a while, it's safe to say the rubber is wasted. Oil breaks rubber down.
Doing the rev test with the brake on is good. Also you can jam a prybar where you can move the engine and watch the mount. A real wasted motor mount will be visibly broken. Also, if you've had an oil leak onto a mount (like the trans mount) for a while, it's safe to say the rubber is wasted. Oil breaks rubber down.
