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I have a 1999 volvo v70 xc (2.4 turbo all wheel drive).
A couple months ago I started getting a vibration in the dash. The upper torque rod was bad. I replaced it. I also replaced the lower torque strut because it was questionable. I put the car on a lift and looked around underneath while someone shifted it from reverse to drive.. None of the other mounts seem to be in bad shape and they do not appear to have any excessive movement.
I didn’t see anything touching or rubbing against the body or subframing.
The vibration only happens in Park, in drive, and under acceleration. There is no vibration in reverse or when I let off the gas (and the engine is slowing the car).
Everything in my gut tells me it’s an engine/transmission Mount, but I’m not seeing any evidence of a bad Mount. I don’t want to just replace the mounts with out proof because they are pretty expensive.
Hopefully someone has resolved an issue like this.
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The balancer/pulley is all metal. There isn’t any rubber to seperate. It’s there a way to confirm whether the balancer is the issue other than just a visual inspection?
If it were a balancer issue, why would it vibrate in Park and drive, but not reverse?[quote=”thisisbuod” post=180627]The balancer/pulley is all metal. There isn’t any rubber to seperate. It’s there a way to confirm whether the balancer is the issue other than just a visual inspection?
If it were a balancer issue, why would it vibrate in Park and drive, but not reverse?[/quote]Good question my friend. Then it seems to change with engine position. The engine should move back
when in reverse. It maybe a mount thing. Try the stall speed test.This test won’t really help me cause the problem exists all through the rpm range. It’s more prominent under heavy load.
The engine moves forward when in reverse. In a horizontally mounted drive train the engine will always move the opposite direction of the wheels (ie Newton’s third law). This makes me suspect the rear engine mount. When in Park, neutral, and drive the engine is reading on that mount, but in reverse the engine twists forward and has very little load on rear mount.
This is my current theory.
Like I said, I didn’t see excessive movement in the drive train, but that may just be because the 5 other mounts are restricting movement.
Of course the rear mount is not in a very convenient spot so I’m gonna wait till the weather gets above 20 degrees to check it out.
Since this is not definitive I’m still open to any other theories or suggestions.
I feel like I need to say I mean no disrespect college man. I value your input . I’ve been a fan of yours for a while (no homo lol)No worries. I know you put it in gear to check the mounts. Did you try it with your foot on the brake
and giving it some gas in gear? That might show a mount issue better.Yes. I tried it in gear with my foot on the gas and brake. I followed normal procedure for engine mount diag. I didn’t see any excessive movement in any particular mount, but like I said the drive train has 6 mounts. If 1 out of 6 mounts is bad, the other mounts will probably restrict any excessive movement.
When the weather breaks I’ll try to take a look at the rear mount.
The car has 180k on it. Ii wouldn’t doubt it if these were the original mounts.
The manufacturer estimates a10 year life span.[quote=”thisisbuod” post=180661]Yes. I tried it in gear with my foot on the gas and brake. I followed normal procedure for engine mount diag. I didn’t see any excessive movement in any particular mount, but like I said the drive train has 6 mounts. If 1 out of 6 mounts is bad, the other mounts will probably restrict any excessive movement.
When the weather breaks I’ll try to take a look at the rear mount.
The car has 180k on it. Ii wouldn’t doubt it if these were the original mounts.
The manufacturer estimates a10 year life span.[/quote]keep us posted on the mount inspection when it warms up.
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