Marine Power 4.3 VORTEC MPI User Manual

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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.

Marine Power 4.3 VORTEC MPI Specifications

General

Brand	Marine Power
Model	4.3 VORTEC MPI
Category	Engine
Language	English