Engine Mechanical: Diagnosis Suzuki SX4 I

Air Cleaner Filter Inspection and Cleaning

Reference: AIR CLEANER FILTER REMOVAL AND INSTALLATION

Inspection

Check air cleaner filter for dirt.

Electric Throttle Body On-Vehicle Inspection

Check electric throttle body assembly, referring to "Throttle Valve Operation Check" and "Electric Throttle Body Assembly Operation Check" under ELECTRIC THROTTLE BODY ASSEMBLY ON-VEHICLE INSPECTION .

Timing Chain Cover Cleaning and Inspection

Reference: TIMING CHAIN COVER REMOVAL AND INSTALLATION

Check oil seal lip for fault or other damage. Replace as necessary.

Scheme 2

2nd Timing Chain and Chain Tensioner Inspection

Reference: 2nd TIMING CHAIN AND CHAIN TENSIONER REMOVAL AND INSTALLATION

1st Timing Chain and Chain Tensioner Inspection

Reference: 1st TIMING CHAIN AND CHAIN TENSIONER REMOVAL AND INSTALLATION

Camshaft, Tappet and Shim Inspection

Reference: CAMSHAFTS, TAPPET AND SHIM REMOVAL AND INSTALLATION

Valves and Valve Guides Inspection

Reference: VALVES AND CYLINDER HEAD DISASSEMBLY AND REASSEMBLY

Cylinder Head Inspection

Reference: CYLINDER HEAD COVER REMOVAL AND INSTALLATION

Scheme 3

Scheme 4

Scheme 5

1. Remove all carbon deposits from combustion chambers. NOTE: Do not use any sharp-edged tool to scrape off carbon deposits. Be careful not to scuff or nick metal surfaces when decarbonizing. The same applies to valves and valve seats, too.
2. Check cylinder head for cracks on intake and exhaust ports, combustion chambers, and head surface. Using a straightedge and thickness gauge, check flatness of gasketed surface at a total of 6 locations. If distortion limit is exceeded, correct gasketed surface with a surface plate and abrasive paper of about #400 (Waterproof silicon carbide abrasive paper): place abrasive paper on and over surface plate, and rub gasketed surface against paper to grind off high spots. Should this fail to reduce thickness gauge readings to within limit, replace cylinder head. Leakage of combustion gases from this gasketed joint is often due to warped gasketed surface: such leakage results in reduced power output. Distortion for cylinder head surface on piston side Limit: 0.03 mm (0.001 in.)
3. Distortion of manifold seating faces: Check seating faces of cylinder head for manifolds, using a straightedge and thickness gauge, in order to determine whether these faces should be corrected or cylinder head replaced. Distortion for cylinder head surface on intake and exhaust manifold Limit: 0.05 mm (0.002 in.)

Valve Spring Inspection

Reference: VALVES AND CYLINDER HEAD DISASSEMBLY AND REASSEMBLY

Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning

Reference: PISTONS, PISTON RINGS, CONNECTING RODS AND CYLINDERS DISASSEMBLY AND REASSEMBLY

Cylinder Block Heater Inspection (If Equipped)

Reference: CYLINDER BLOCK HEATER REMOVAL AND INSTALLATION (IF EQUIPPED)

Scheme 6

1. Check continuity between terminals "a" and "c". If there is no continuity, replace it.
2. Check that there is no continuity between terminals "a" or "b" and "c". If there is continuity, replace it.
3. Check continuity between terminal "c" and cylinder block heater body. If there is no continuity, replace it.

Scheme 7

Main Bearings, Crankshaft and Cylinder Block Inspection

Reference: MAIN BEARINGS, CRANKSHAFT AND CYLINDER BLOCK REMOVAL AND INSTALLATION

Main bearings inspection

Check bearings for pitting, scratches, wear or damage.

If any malcondition is found, replace both upper and lower halves. Never replace either half without replacing the other half.