Mazda 626 MX-6 Workshop Manual page 14

1
TROUBLESHOOTING GUIDE
Problem
Insufficient power Insufficient compression
Malfunction of HLA
Compression leakage from valve seat
Seized valve stem
Weak or broken valve spring
Failed cylinder head gasket
Cracked or distorted cylinder head
Sticking, damaged, or worn piston ring
Cracked or worn piston
Malfunction of fuel system
Others
Slipping clutch
Dragging brakes
Wrong size tires
Malfunction of engine-related components
Abnormal
Malfunction of HLA
combustion
Sticking or burned valve
Weak or broken valve spring
Carbon accumulation in combustion chamber
Malfunction of fuel system
Crankshaft or bearing related parts
Engine noise
Excessive main bearing oil clearance
Main bearing seized or heat-damaged
Excessive crankshaft end play
Excessive connecting rod bearing oil clearance
Connecting rod bearing seized or heat-damaged
Piston related parts
Worn cylinder
Worn piston or piston pin
Seized piston
Damaged piston ring
Bent connecting rod
Valves or timing related parts
Malfunction of HLA*
Broken valve spring
Excessive valve guide clearance
Malfunction of timing belt tensioner
Malfunction of cooling system
Malfunction of fuel system
Others
Malfunction of water pump bearing
Improper drive-belt tension
Malfunction of alternator bearing
$ '
Exhaust gas leakage
* Tappet noise may occur if the engine is not operated for an extended period of time. The noise should stop after the
engine has reached normal operating temperature.
1—4
Possible Cause
Remedy Page
Replace 1 -6 9
Repair 1 -4 5
Replace 1—43
Replace 1—46
Replace 1 -1 6
Replace 1 -4 2
Replace 1 -51
Replace 1—51
Refer to Section 4
Refer to Section 6
Refer to Section 11
Refer to Section 12
1 -6 9
Replace
1 -4 3
Replace
1 -4 6
Replace
Eliminate carbon
Refer to Section 4
Replace or repair 1 -5 8
1 -5 8
Replace
Replace or repair 1 -6 0
Replace or repair 1-6 1
1-6 1
Replace
Replace or repair 1 -4 9
1-51,52
Replace
1-5 1
Replace
1-5 1
Replace
Replace 1 -5 2
1 -6 9
Replace
1 -4 6
Replace
1 -4 3
Replace
1 -5 5
Replace
Refer to Section 3
Refer to Section 4
Replace
Adjust 1 - 6
Replace
Repair 1 -4 2
86U01X-004