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MECHANICAL
Symptom
10. Excessive fuel consump-
tion
Engine Trouble in General
Problem parts, etc.
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
Intake system
Chain
Compression
Lubrication system
Cooling system
ME(H6DO)-92
Possible cause
Dirty air cleaner element
Defective timing
Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective gasket
Improper valve sealing
Defective valve stem
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Trouble of tappet
Trouble of tappet. In case noise occurs with valve mov-
ing. Or the harness involved to oil switching solenoid
valve, variable valve lift diagnosis oil pressure switch
and variable valve lift has trouble in a past.
Incorrect oil pressure
Over-cooling
Rank
A
A
B
B
C
C
B
C
C
B
B
C
B
C
C
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