Symptoms
Oil inside the red ECU plug, poor starting, misfires or rough running, injector fault codes.
The fix, step by step
- Disconnect the battery and lift the ECU out to check the plugs; clean oil out of the connector with a fast-drying solvent.
- Remove the acoustic cover and rocker cover, unclip the five injector plugs and the plug where the main loom meets the injector harness, and lift the harness out.
- Clean the bore where the harness connector seals into the head, fit the later modified harness with new O-rings, clip everything home and refit the rocker cover with a new gasket.
- Some owners also flush oil out of the main loom with solvent.
Tools & part numbers
- 1/4-in ratchet and 8, 10 and 13 mm sockets, torque wrench, solvent cleaner, RTV
- AMR6103 harness, NYX100080 O-rings, rocker cover gasket
Where to buy the parts
AMR6103 fuel injector wiring harness, Td5LR Direct ↗Amazon ↗
NYX100080 injector harness O-ring, Td5LR Direct ↗Amazon ↗
LVP000020 rocker cover gasket, Td5 (from 1A)LR Direct ↗Amazon ↗
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Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.