GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value

Yes

No

DEFINITION: The clutch grabs or chatters during engagement.

1

Inspect the engine mounting fasteners.

Are the engine mounts loose or tightened out of sequence?

--

Go to Step 2

Go to Step 3

2

Tighten the engine mounting fasteners to the specified torque. Refer to Fastener Tightening Specifications .

Does the clutch still grab?

--

Go to Step 3

System OK

3

Check for a damaged engine mount.

Is the engine mounting damaged?

--

Go to Step 4

Go to Step 5

4

Replace the engine mount. Refer to Engine Mount Replacement (Front ) in Engine Mechanical.

Does the clutch still grab?

--

Go to Step 5

System OK

5

Check the pressure plate assembly for burned or smeared resin.

Is there burned or smeared resin on the pressure plate?

--

Go to Step 6

Go to Step 7

6

If the burns or smears are superficial, clean or sand off the excess resin. If the pressure plate assembly is burned or has heat checked parts, then replace the pressure plate assembly. Refer to Clutch Assembly.

Does the clutch still grab?

--

Go to Step 7

System OK

7

Check for a warped pressure plate.

Is the pressure plate warped?

--

Go to Step 8

Go to Step 9

8

Replace the pressure plate. Ensure that the runout does not exceed the amount given in the value column. Refer to Clutch Assembly.

Does the clutch still grab?

--

Go to Step 9

System OK

9

Check for oil on the clutch pressure plate facing or a burned or glazed facing.

Is there oil on the clutch pressure plate facing or a burned or glazed facing?

--

Go to Step 10

Go to Step 11

10

Correct the leak at the source. Refer to Oil Leak Diagnosis in Engine Mechanical.

Install a new clutch pressure plate.

Does the clutch still grab?

Go to Step 11

System OK

11

Check for worn splines on the transmission main drive gear.

Are there worn splines on the transmission main drive gear?

--

Go to Step 12

Go to Step 13

12

Replace the transmission main drive gear. Refer to Transmission Case Disassembly/Assembly in Manual Transmission.

Does the clutch still grab?

--

Go to Step 13

System OK

13

Inspect the release bearing at the transmission main drive gear.

Is the release bearing binding on the retaining tube on the transmission main drive gear?

--

Go to Step 14

--

14

Replace the necessary components.

Does the clutch still grab?

--

Go to Step 1

System OK