| TIBURON(GK) >2005 > G 2.7 DOHC > Engine Mechanical System > General Information>Troubleshooting |

TROUBLESHOOTING
Symption | Suspect area | Remedy (See page)
Engine misfire with abnormal internal lower engine noises. | Loose or improperly installed engine flywheel. | Repair or replace the flywheel as required.
Worn piston rings (Oil cousumption may or may not cause the engine to misfire.) | Inspect the cylinder for a loss of compression. Repair or replace as required.
Worn crankshaft thrust bearings | Replace the crankshaft and bearings as required
Engine misfire with abnormal valve train noise. | Stuck valves. (Carbon buidup on the valve stem) | Repair or replace as required
Excessive worn or mis-aligned timing chain | Replace the timing chain and sprocket as required.
Worn camshaft lobes. | Replace the camshaft and valve lifters.
Engine misfire with coolant consumption |
• | Faulty cylinder head gasket and/or cranking or other damage to the cylinder head and engine block cooling system.
• | Coolant consumprion may or may not cause the engine to overheat.
• | Inspect the cylinder head and engine block for damage to the coolant passages and/or a faulty head gasket.
• | Repair or replace as required.
Engine misfire with excessive oil consumption | Worn valves, guides and/or valve stem oil seals. | Repair or replace as required.
Worn piston rings. (Oil consumption may or may not cause the engine to misfire) |
• | Inspect the cylinder for a loss of compression.
• | Repair or replace as required.
Engine noise on start-up, but only lasting a few seconds. | Incorrect oil viscosity |
• | Drain the oil.
• | Install the correct viscosity oil.
Worn crankshaft thrust bearing. |
• | Inspect the thrust bearing and crankshaft.
• | Repair or replace as required.
Upper engine noise, regardless of engine speed. | Low oil pressure | Repair or replace as required.
Broken valve spring. | Replace the valve spring.
Worn or dirty valve lifters. | Replace the valve lifters.
Stetched or broken timing chain and/or damaged sprocket teeth. | Replace the timing chain and sprockets.
Worn timing chain tensioner, if applicable. | Replace the timing chain tensioner as required.
Worn camshaft lobes. |
• | Inspect the camshaft lobes.
• | Replace the timing camshaft and valve lifters as required.
Worn valve guides or valve stems. | Inspect the valves and valve guides, then repair as required.
Stuck valves. (Carbon on the valve stem or valve seat may cause the valve to stay open. | Inspect the valves and valve guides, then repair as required.
Lower engine noise, regardless of engine speed | Low oil pressure. | Repair or required.
Loose or damaged flywheel. | Repair or replace the flywheel.
Damaged oil pan, contacting the oil pump screen. |
• | Inspect the oil pan.
• | Inspect the oil pump screen.
• | Repair or replace as required.
Oil pump screen loose, damaged or restircted. |
• | Inspect the oil pump screen.
• | Repair or replace as required.
Excessive piston-to-cylinder bore clearance. |
• | Inspect the piston, piston pin and cylinder bore.
• | Repair as required.
Excessive piston pin-to-connecting rod clearance |
• | Inspect the piston, piston pin and the connecting rod.
• | Repair or replace as required.
Excessive connecting rod bearing clearance | Inspect the following components and repair as required.
• | The connecting rod bearings.
• | The connecting rods.
• | The crankshaft.
• | The crankshaft journal.
Excessive crankshaft bearing clearance | Inspect the following components, and repair as required.
• | The crankshaft bearing.
• | The crankshaft journals.
Incorrect piston, piston pin and connecting rod installation |
• | Verify the piston pins and connecting rods are installed correctly.
• | Repair as required.
Engine noise under load | Low oil pressure | Repair or replace as required.
Excessive connecting rod bearing clearance | Inspect the following components and repair as required :
• | The connecting rod bearings.
• | The connecting rods.
• | The crankshaft
Excessive crankshaft bearing clearance | Inspect the following components, and repair as required.
• | The crankshaft bearings.
• | The crankshaft journals.
• | The cylinder block crankshaft
Engine will not crank-crankshaft will not rotate | Hydraulically locked cylinder
• | Coolant/antifreeze in cylinder.
• | Oil in cylinder.
• | Fuel in cylinder
1. | Remove spark plugs and check for fluid.
2. | Inspect for broken head gasket.
3. | Inspect for cracked engine block or cylinder head.
4. | Inspect for a sticking fuel injector and/or leaking fuel regulator.
Broken timing chain and/or timing chain gears. |
1. | Inspect timing chain and gears.
2. | Repair as required.
Material in cylinder
• | Broken valve
• | Piston material
• | Foreign material
1. | Inspect cylinder for damaged components and/or foreign materials.
2. | Repair or replace as required.
Seized crankshaft or connecting rod bearings. |
1. | Inspect crankshaft and connecting rod bearing.
2. | Repair as required.
Bend or broken connecting rod. |
1. | Inspect connecing rods.
2. | Repair as required.
Broken crankshaft |
1. | Inspect crankshaft.
2. | Repair as required.