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Problem Corrective ActionPossible Causes
Malfunction Indicator Light (MIL)
comes on.
1. Old gas in gas tank or fuel shut
off valve not open completely.
1. Use new gas and ensure shut
off valve is open.
2. Fuel tank vent cap is blocked. 2. Make sure fuel tank vent cap is
not blocked and working
properly.
3. Air cleaner is dirty. 3. Make sure air cleaner and
precleaner is clean. Replace if
necessary.
4. Incorrect fuel filters used or
dirty fuel filters.
4. Install correct fuel and ensure
that it is clean.
5. Connections to sensors,
electronic control unit (ECU),
and fuel injectors are not
secured properly.
5. Ensure all connections to
sensors are properly secured.
6. 12 volt battery being used is
not fully charged.
6. Ensure a good 12 volt battery
is being used and fully charged.
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