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12.
Trouble Shooting
Engine Runs Poorly at High RPM
Possible Cause
Remedy
Low Grade or Old Fuel
Check/Clean/Replace
Ignition Timing
Only Pertains to HVS (Distributor) on 5.7L. See Dealer
Active Trouble Code
See Dealer
Engine Overheating
See Engine Overheating on Page 45
Restricted Exhaust
Check Exhaust System
Overfilled Crankcase
Check Oil Level
Plugged Fuel Tank Vent
Check Vent Line for Blockage
Insufficient Fuel Supply
Approximately 60 PSI. Fuel Pressure Must Be Adequate at Wide Open Throttle at Full Load
Restricted Anti-Siphon Valve
Remove From Fuel Tank and Verify Spring Pressure
Low Compression
See Dealer
Engine performance can be greatly affected by boat hull and prop condition.
High Speed Miss
Possible Cause
Remedy
Water in Fuel
Inspect/Clean/Replace
Clogged Fuel Filter
Change Fuel Filter
Insufficient Fuel Supply
Approximately 60 PSI. Fuel Pressure Must Be Adequate at Wide Open Throttle at Full Load
Spark Plug or Wires
Verify That All Plug Wires Are Attached
Loose Ignition Connection
Check That All Connectors Are Attached
Detonation
Verify Fuel Pressure and Fuel Quality
NOTE: A Misfire will Cause a Trouble Code and RPM Reduction.
Summary of Contents for 4.3 VORTEC MPI
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