Grinding Grizz!

[willwren]

Ok, which is it?

Knock sensor, or ESC circuit? They're not related at all.

[2000Silverbullet]

Well the scanner says 325 Elec Spark Control failure but when I look in the FSM it relates 325 to the Knock sensor circuit.

[2000Silverbullet]

The SES code has been removed.

The Knock sensor connector had somehow come off.

The noise was isolated to the torque axis mount. I can lever a screw driver to make the engine move forwards and backwards at the passenger side and the forks of the engine bracket mount contact the metal wrapped rubber piece.

Now, I need some help to determine if this torque axis mount is supposed to control that kind of movement.......or is it the lower transaxle dogbone??

GM service said it was the torque axis mount that needs to be replaced........but it's $200. !!!!

The dogbone is only $30. but the closes one is in Ontario.

Bill - can you try to pry yours back and forth to see if you get movement?

[JMH1950]

GM service said it was the torque axis mount that needs to be replaced........but it's $200. !!!!

The dogbone is only $30. but the closes one is in Ontario.

Bill has a spare of everything. Now it may cost you to get it up here, but he probably has one.

[BillBoost37]

LOL, I know what is probably causing that noise.
The engine mount.

The noise was isolated to the torque axis mount. I can lever a screw driver to make the engine move forwards and backwards at the passenger side and the forks of the engine bracket mount contact the metal wrapped rubber piece.

Now, I need some help to determine if this torque axis mount is supposed to control that kind of movement.......or is it the lower transaxle dogbone??

You described it perfectly. Take a closer look at the mount. There is the outter shell and right inside is the metal the rubber is adhered into.. Is that metal rnner ring moving ouf of the outter shell? This is quite common, also common is the rubber cracking and allowing the front of the motor side bracket to hit the body side mount outter shell. The dogbone plays a small part in the overall mount situation and is usually not to blame for noises or issues.

[2000Silverbullet]

I need some help to determine if this torque axis mount is supposed to control that kind of movement.......or is it the lower transaxle dogbone??

But is this torque axis mount supposed to absorb side to side movement or is it the torque mount dogbone??

The rubber looks new and the metal ring is not moving relative to the outer shell.

I don't want to spend money on the more expensive mount, if the cheaper one is the one at fault.

[willwren]

Boosty is right and wrong. The TA mount is not COMMON. It's the second-least likely to fail. It is also, however, oil filled and designed to dampen motion.

The dogbone is the least of your worries. The rubber bushing portion allows very little motion and rarely, if ever fails.

Most common in order:

1. Front trans mount, driver's side.
2. Rear trans mount, driver's side.
3. TA mount (way down the list of odds compared to #1 or #2)
4. Dogbone.

This is true for 92-99 H bodies.

In all my time on this Forum, the previous forum, over 10000 members of this club, and all the cars I've personally wrenched, I KNOW of only ONE confirmed failed TA mount. Grizz would be #2, but the Zilla was close (but in a different league due to the abuse). I certainly wouldn't call this common or quite common. And yes, I read EVERY 92-99 topic posted. While it may be the problem in this case, I think it's important not to over-state the possibilities or failure rates, as new members may be prone to shotgunning problems based on this.


The TA mount serves the following purposes in life:

1. Controls TORQUE AXIS motion when accellerating or deccellerating.
2. Helps dampen vibrations due to the oil-filled rubber-housed cavity.
3. Supports the engine (engine only, not trans) on the passenger side.

There is LIMITED control of motion from wheel to wheel along the crank axis, and rotational motion on a 'street plane' about the center of the engine.

[99ssei]

Just to add my .02...With 144K, I'm on my third (3) trans/motor mount (Currently running a Boostie special! - Thanks again!) and third (3) side motor mount, and just replaced my dogbone mount for the first time (never replaced the rear trans mount - still looks great!). The dogbone was replaced because it was very loose (could wiggle it around with pry bar).

As stated earlier - rockauto is the way to go.

[RockAuto]

If you have any questions on the RockAuto catalog, you can contact us directly: service@rockauto.com or 866-ROCKAUTO. You can also catch me here

www.rockauto.com

Thanks!
Ashley

[2000Silverbullet]

With 144K, I'm on my third (3) trans/motor mount (Currently running a Boostie special! - Thanks again!) and third (3) side motor mount, and just replaced my dogbone mount for the first time (never replaced the rear trans mount - still looks great!). The dogbone was replaced because it was very loose (could wiggle it around with pry bar).

That kind of life from a $250. motor mount is totally unacceptable!

If that's the kind of life to expect from the mounts.....it's time to get rid of this POS!

I think that the Grizz will just grind for quite a while........until something falls off.....
I refuse to keep shotgunning money at this POS!

[willwren]

Paul, read my post. It's quite uncommon to have that mount go. I suspect he had other issues, like another mount allowing too much motion, or substandard (poor quality) parts.

I bought mine from Rock Auto as well. All the mounts currently on the Zilla, actually.

If that mount is your problem, replace it. But CAREFULLY check the others. One other bad mount will increase the load on all the others and shorten their life as well.

[2000Silverbullet]

Bill, I really don't know if that mount is the problem.

That's the issue.

I've had mechanics look at it and tell me that is the problem because they can see the mount hitting but........they don't know if it's the other mounts causing this one to hyperextend in the wrong direction of its axis.

Can you pry your mount over using a crowbar so it contacts the forks?

If you can't, then it could be the torque dogbone or even the rear trani mount that is allowing it.


We are having difficulty prioritizing the repairs.
Victor has limited funds.
He can't even afford to pay for his $300. computer repairs.......and I'm done funding his mistakes.

[willwren]

Paul, it's cheap (free) and easy to ramp the car in the garage and use a jack to test all the mounts. If iron meets steel on the two halves of that mount, either that mount or another is allowing it. There are only 4 to check.

[BillBoost37]

Not looking to step on toes or disprove anyone. Please take this as constructive and helpful only.

I have seem 6-10 of the TA mounts go bad on various vehicles. My own personal mount is shot after only 20K on a fresh mount. Other respected folks on this forum have mentioned their mount being replaced many times as well. The TA mount is the only mount absorbing the desire of the motor to torque on the passenger side of the vehicle. When it is bad the engine side bracket can hit the body side bracket, metal on metal transfers some engine vibration to the body. Currently my mount is in need of replacement.

Paul, here in the states that front mount is $45 from Rockauto, the rear trans mount $11, and the TA mount is $45. Those are not discounted prices. It's unfortunate that you live in Canada when it comes to prices on parts.

If I were to rank my experiences with mounts failing on the 92-99 B'villes it would look like this:
1. Front trans mount
2. TA mount
3. Rear trans mount
4. Dogbone mount.

[99ssei]

Not looking to step on toes or disprove anyone. Please take this as constructive and helpful only.

I have seem 6-10 of the TA mounts go bad on various vehicles. My own personal mount is shot after only 20K on a fresh mount. Other respected folks on this forum have mentioned their mount being replaced many times as well. The TA mount is the only mount absorbing the desire of the motor to torque on the passenger side of the vehicle. When it is bad the engine side bracket can hit the body side bracket, metal on metal transfers some engine vibration to the body. Currently my mount is in need of replacement.

Paul, here in the states that front mount is $45 from Rockauto, the rear trans mount $11, and the TA mount is $45. Those are not discounted prices. It's unfortunate that you live in Canada when it comes to prices on parts.

If I were to rank my experiences with mounts failing on the 92-99 B'villes it would look like this:
1. Front trans mount
2. TA mount
3. Rear trans mount
4. Dogbone mount.

X 2

[2000Silverbullet]

Paul, here in the states that front mount is $45 from Rockauto, the rear trans mount $11, and the TA mount is $45. Those are not discounted prices. It's unfortunate that you live in Canada when it comes to prices on parts.

x2

How can this be? Even with exchange and freight costs.....

$45 to $250 is either robbery or else the Rockauto part is substandard and that might explain why you go thru so many of them so quickly.

......or it's a design flaw that causes premature failure.

Either way, the Grizz is going to live with the Grinding for a while....

[99ssei]

How can this be? Even with exchange and freight costs.....

Trans mounts for the 2000 at Rock Auto:


Motor mount through GM parts direct:

$45 to $250 is either robbery or else the Rockauto part is substandard and that might explain why you go thru so many of them so quickly.

......or it's a design flaw that causes premature failure.

I think it's the latter. A project I will start soon is removing the rubber from the side motor mount and insert some hockey pucks.

[J Wikoff]

Got a comparison of the mount the Grizz would use?

[99ssei]

Oh...I thought the 2000 was the Grizz. My mistake.

[J Wikoff]

It's a Series I. I had to go back too and saw it wasn't in the original post.