Quantcast FUEL CONSUMPTION TOO HIGH

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TROUBLESHOOTING
TESTING AND ADJUSTING
15. FUEL CONSUMPTION TOO HIGH
Cause:
Correction:
Fuel System Leaks
Tighten or make replacement of parts at points of
leakage.
Fuel and Combustion Noise (Knock)
Make Reference to Item 7 and Item 9.
Wrong Fuel Injection Timing
Make adjustment to timing.
Defect in Fuel Injector(s)
Make Reference to Item 7.
16. LOUD VALVE TRAIN NOISE
Cause:
Correction:
Damage to Valve Spring(s)
Make replacement of parts with damage.
Damage to Camshaft
Make replacement of parts with damage. Clean engine
thoroughly. If replacement of camshaft is made, new
valve lifters are also necessary.
Damage to Valve Lifter
Clean engine thoroughly.  Make a replacement of the
damaged valve lifters.  Inspect camshaft lobes for
damage. Look for valves that do not move freely. Make
an adjustment to valve clearance according to the
Subject, VALVE CLEARANCE.
17. TOO MUCH VALVE LASH
Cause:
Correction:
Not Enough Lubrication
Check lubrication in valve compartment. There must be
a strong flow of oil at engine high rpm, but only a small
flow at low rpm. Oil passages must be clean, especially
those sending oil to the cylinder head.
Rocker Arm Worn at Face That Makes Contact
If there is too much wear, install new parts or rocker
With Bridge
arms. Make adjustment of valve clearance according to
Subject, VALVE CLEARANCE.
Bridges for Valves Worn
Make an adjustment or replacement as necessary.
End of Valve Stem Worn
If there is too much wear, install new valves.  Make
adjustment to valve clearance according to Subject,
VALVE CLEARANCE.
Worn Push Rods
If there is too much wear, install new push rods. Make
adjustment of valve clearance according to Subject,
VALVE CLEARANCE.
Broken or Worn Valve Lifters
Install new valve lifters.  Check camshaft for wear.
Check for free movement of valves or bent valve stem.
Clean engine thoroughly.  Make adjustment of valve
clearance according to Subject, VALVE CLEARANCE
(Cont. next page)
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