| VELOSTER(FS) >2013 > G 1.6 T-GDI > Engine Mechanical System > General Information>Troubleshooting |

Troubleshooting
Symptom | Suspect area | Remedy
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 consumption 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 buildup on the valve stem can cause the valve not to close properly.) | 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 MLA.
Engine misfire with coolant consumption. |
• | Faulty cylinder head gasket and/or cracking or other damage to the cylinder head and engine block cooling system.
• | Coolant consumption 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, valve 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) | Inspection 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.
Stretched 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 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 replace damaged components as 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 restricted. | Inspect the oil pump screen. Repair or replace as required.
Excessive piston-to-cylinder bore clearance. | Inspect the piston and cylinder bore. Repair as required.
Excessive piston pin-to-bore 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 bearings.
• | 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 bearing bore.
Engine will not crank. (crankshaft will not rotate) | Hydraulically locked cylinder.
• | Coolant/antifreeze in cylinder.
• | Oil in cylinder.
• | Fuel in cylinder.
| Remove spark plugs and check for fluid. Inspect for broken head gasket. Inspect for cracked engine block or cylinder head. Inspect for a sticking fuel injector and/or leaking fuel regulator.
Broken timing chain and/or timing chain gears. | Inspect timing chain and gears. Repair as required.
Foreign material in cylinder.
• | Broken valve.
• | Piston material.
• | Foreign material.
| Inspect cylinder for damaged components and/or foreign materials. Repair or replace as required.
Seized crankshaft or connecting rod bearings. | Inspect crankshaft and connecting rod bearing. Repair or replace as required.
Bent or broken connecting rod. | Inspect connecting rods. Repair or replace as required.
Broken crankshaft. | Inspect crankshaft. Repair or replace as required.