Opel Frontera UE. Manual - part 866
6A–13
ENGINE MECHANICAL (6VD1 3.2L)
Troubleshooting Procedure
The slapping sound stops when spark plug on bad
cylinder is shorted out.
Condition
Possible cause
Correction
Timing belt noise
Timing belt tension is incorrect
Replace pusher or adjust the tension
pulley or replace timing belt
Tensioner bearing defective
Replace
Timing belt defective
Replace
Timing pulley defective
Replace
Timing belt comes in contact with
timing cover
Replace timing belt and timing cover
Valve noise
Valve clearance incorrect
Replace adjusting shim
Valve and valve guide seized
Replace valve and valve guide
Valve spring broken or weakened
Replace
Valve seat off–positioned
Correct
Camshaft worn out
Replace
Crankshaft noise
Crankshaft end play excessive
(noise occurs when clutch is
engaged)
Replace thrust bearing
Engine knocking
Preignition due to use of spark plugs
of inadequate heat range
Install Spark Plugs of adequate heat
range
Carbon deposits in combustion
chambers
Clean
Fuel too low in octane rating
Replace fuel
Wide Open Throttle enrichment
system failure
Refer to Section 6E
Selection of transmission gear
incorrect
Caution operator of incorrect gear
selection
Engine overheating
Refer to “Engine Lacks Power”
Others
Water pump defective
Replace
Drive belt slipping
Replace auto tentioner or drive belt