Knocks at Idle Hot
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| 1 | Does the engine knock at idle when hot? | - | Go to Step 2 | System OK |
| 2 | Inspect the drive belts. Are the belt loose or worn? |
- | Go to Step 3 | Go to Step 4 |
| 3 | Tension or replace the belts, as necessary. Is the repair complete? |
- | Go to Step 1 | - |
| 4 | Inspect the A/C compressor and the generator. Is either the compressor or the generator faulty? |
- | Go to Step 5 | Go to Step 6 |
| 5 | Replace the faulty A/C compressor or the generator. Is the repair complete? |
- | Go to Step 1 | - |
| 6 | Inspect the valve train. Are valve train components faulty? |
- | Go to Step 7 | Go to Step 8 |
| 7 | Replace faulty valve train components. Is the repair complete? |
- | Go to Step 1 | - |
| 8 | Inspect the engine oil. Is the proper viscosity oil used in the crankcase? |
- | Go to Step 10 | Go to Step 9 |
| 9 | Install oil of the proper viscosity for the expected seasonal temperatures. Is the repair complete? |
- | Go to Step 1 | - |
| 10 | Inspect the piston pin clearance. Is the clearance more than the specified value? |
0.020 mm (0.0008 in) | Go to Step 11 | Go to Step 12 |
| 11 | Replace the piston and the pin. Is the repair complete? |
- | Go to Step 1 | - |
| 12 | Inspect the connecting rod alignment. Is the alignment faulty? |
- | Go to Step 13 | Go to Step 14 |
| 13 | Inspect and replace rods as necessary. Is the repair complete? |
- | Go to Step 1 | - |
| 14 | Inspect the piston-to-bore clearance. Is the clearance equal to the specified value? |
0.04 mm (0.0015 in) | Go to Step 16 | Go to Step 15 |
| 15 | Hone the bore and fit a new piston. Is the repair complete? |
- | Go to Step 1 | - |
| 16 | Inspect the crankshaft balancer. Is the balancer loose? |
- | Go to Step 17 | Go to Step 18 |
| 17 | Torque or replace worn parts. Is the repair complete? |
- | Go to Step 1 | - |
| 18 | Measure the piston pin offset toward the thrust side. Is the offset equal to the value specified? |
0.55-0.85 mm (0.02-0.03 in) | Go to Step 19 | System OK |
| 19 | Install the correct piston. Is the repair complete? |
- | Go to Step 1 | - |