GM Service Manual Online
For 1990-2009 cars only

Excessive Smoke White

Step

Action

Values

Yes

No

1

Is the engine oil used within the specified viscosity?

30-44 API Gravity

Go to Step 2

Go to Step 13

2

Is the fuel used within the recommended specification?

--

Go to Step 3

Go to Step 14

3

Is the fuel contaminated with gasoline?

--

Go to Step 14

Go to Step 4

4

Does air bleed from the fuel lines?

--

Go to Step 5

Go to Step 15

5

Is the compression normal?

--

Go to Step 6

Go to Step 16

6

Inspect the ECT system.

When the atmospheric temperature is low, does the water temperature sensor operate normally?

--

Go to Step 7

Go to Step 17

7

When the atmospheric temperature is low, does the atmospheric temperature sensor operate normally?

--

Go to Step 8

Go to Step 18

8

When the atmospheric temperature is normal, does the CKP sensor operate normally?

--

Go to Step 9

Go to Step 19

9

When the atmospheric temperature is normal, does CAM sensor work normal?

--

Go to Step 10

Go to Step 20

10

If blue smoke is present, is oil entering down through the turbocharger oil seal?

--

Go to Step 21

Go to Step 11

11

If blue smoke is present, is oil entering down through the piston ring?

--

Go to Step 22

Go to Step 12

12

If blue smoke is present, is oil entering down through the valve stem?

--

Go to Step 16

Go to Step 24

13

Replace the engine oil.

Did you complete the replacement?

--

Go to Step 24

--

14

Replace the fuel with the recommended specification.

Did you complete the replacement?

30-44 API Gravity

Go to Step 24

--

15

Bleed the air from the fuel line.

Did you complete the action?

--

Go to Step 24

--

16

Repair/replace the piston ring, valve stem seal etc.

Did you complete the action?

--

Go to Step 24

--

17

Replace the ECT sensor.

Did you complete the replacement?

--

Go to Step 24

--

18

Replace the AAT sensor.

Did you complete the replacement?

--

Go to Step 24

--

19

Replace the CKP sensor.

Did you complete the replacement?

--

Go to Step 24

--

20

Replace the CAM sensor.

Did you complete the replacement?

--

Go to Step 24

--

21

Replace the turbocharger oil seal.

Did you complete the replacement?

--

Go to Step 24

--

22

Replace the piston ring.

Did you complete the replacement?

--

Go to Step 24

--

23

Replace the valve stem seal.

Did you complete the replacement?

--

Go to Step 24

--

24

Finish this program and return to the diagnostic procedure if necessary.

Did you complete the action?

--

System OK

--

Excessive Smoke Black

Step

Action

Value

Yes

No

1

Is the engine oil used within the specified viscosity?

--

Go to Step 2

Go to Step 9

2

Is the fuel used within the recommended specification?

30-44 API Gravity

Go to Step 3

Go to Step 10

3

Is the compression more than the specified value?

2157 kPa (313 psi)

Go to Step 4

Go to Step 11

4

Is there a restriction in the exhaust system?

--

Go to Step 5

Go to Step 12

5

Does turbocharger operate properly?

--

Go to Step 6

Go to Step 13

6

Does the boost pressure sensor operate properly?

--

Go to Step 7

Go to DTC 0032 , DTC 0042 , or DTC 0065

7

Is carbon built up on the tip of the injector?

--

Go to Step 14

Go to Step 8

8

Is there carbon build up or damage to the pistons or the cylinders?

--

Go to Step 12

System OK

9

Replace the engine oil.

Did you complete the action?

--

Go to Step 15

--

10

Replace the fuel with fuel of the recommended specification.

Did you complete the action?

--

Go to Step 15

--

11

Repair/replace the piston ring, valve stem seal etc.

Did you complete the action?

--

Go to Step 15

--

12

Repair/replace the problem portion.

Did you complete the action?

--

Go to Step 15

--

13

Repair/replace the turbocharger.

Did you complete the action?

--

Go to Step 15

--

14

Replace the injector assembly.

Did you complete the action?

--

Go to Step 15

--

15

Finish this program and return to the diagnostic procedure if necessary.

Did you complete the action?

--

System OK

--