Hello have alot of oil around injectors done rocker cover seal could it be injector seals

Check you have the correct injectors - if so - spray soapy water around the injectors and lines while the engine is running to check for leaks.
If this does not fix the problem - call an expert ??

Installing
Note: Install a new pump-injector unit, also replace the corresponding adjustment bolt in rocker arm.
For every procedure that requires adjustment of the pump-injector unit, the adjustment screw in the rocker lever and the ball pin of the pump-injector unit must be replaced.
New Pump-Injector Units are shipped with O-rings and heat protection seal.
Install the pump-injector unit again, replace the O-rings and the heat protection seal Pump Injector Unit O-Rings, Removing and Installing .
Before installing Pump-Injector Unit, check that the three O-rings, heat protection seal and securing ring are seated properly.
Note:
O-rings must not be twisted on themselves.
Oil O-rings and insert Pump-Injector Unit with great care into cylinder head seat.
Using uniform pressure, push the pump-injector unit into the cylinder head seat onto the stop.
Insert tension block into lateral slot of Pump-Injector Unit.
Note:
If Pump-Injector Unit does not stand at right angle to tension block, securing bolt can loosen and thereby cause damage to Pump-Injector Unit / cylinder head.
Align Pump-Injector Unit as follows.
Screw the new bolt into the tension block so far that the pump-injector unit can still be lightly turned.
Now align Pump-Injector Unit at right angle to thrust bearing of camshaft.
Using a caliper gauge (measuring range minimum 400 mm), check dimension "a" from the outer edge of the cylinder head to the round surface of the pump injector unit.
Cylinder Dimension a
1 333.0 0.8 mm
2 245.0 0.8 mm
3 153.6 0.8 mm
4 65.6 0.8 mm
Re-align Pump-Injector Unit if necessary and tighten securing bolt as follows:
Tighten the securing bolts to 12 Nm and turn an additional 270 degree ( 3 / 4 rotation, additional rotation may occur in several stages).
Install rocker arm axle and tighten new securing bolts as follows:
First hand-tighten the inner bolts - 2 - , then the outer bolts - 1 - equally; then tighten in the same sequence to 20 Nm and 90 degree ( 1 / 4 turn).
Place a dial gauge as shown onto the adjustment screw of the pump-injector unit.
Rotate crankshaft in direction of engine rotation until rocker arm roller stands at camshaft point. Roller side - arrow A - is positioned at the highest point, dial gauge - arrow B - is positioned at the lowest point
Remove the dial gauge.
Now turn adjustment bolt into rocker arm until significant resistance is noticeable (Pump-Injector element stands at stop).
Turn back adjustment bolt from stop approximately 180 degree
Hold adjustment bolt in this position and tighten lock nut to 30 Nm.

Bad injector O rings.

The oil can't get into the injectors it must be getting around the injector body seal ,then causing this problem ,renew the seals .

injector leaking from the leak off under the rocker cover is only cause that i know off ,unless they are external type if so then check the injector pump front seal if chain driven ,never seen one of these CO2 global warming machines so i cannot know what the set up is on the engine

Not easy but doable. I would mark anything you aren't familiar with to get it back together right. Please let me know if you have any questions, and thanks for using FixYa.


IGNITION COIL REMOVAL & INSTALLATION
3.0L Engine

1. Remove the wiper arms
2. Remove the left and right side air inlet grilles
3. Remove the wiper motor.
4. Detach the power brake booster vacuum connection from the intake plenum.
5. Disconnect the spark plug wiring harness from the ignition coil.
6. Detach the electrical connection from the ignition coil.
7. Remove the bolts from the ignition coil, and remove the coil.

To install:

1. Installation is the reversal of the removal procedure.
2. Tighten the coil bolts to 71 inch lbs. 8 (Nm).
3. Tighten the power brake booster vacuum connection until snug.

valve cover removal & installation3.0L Engine
RIGHT

1. Disconnect the negative battery cable.
2. Remove the intake plenum and the intake manifold.
3. Remove the spark plug boots from the spark plugs, and then the wires from the routing retainers. Make sure they are tagged for proper installation.
4. Remove the rocker arm cover-to-cylinder screws, the cover, and the gasket/seals. Discard the seals.

NOTE Ensure all eight sealing O-rings are accounted for. They may stick to the camshaft bearing caps or fall into the oil return journals in the cylinder head.

Fig. The location of the valve cover O-rings is shown here

Fig. The valve cover sealant application points
To install:

1. Install new valve cover seals. Lightly coat the new seals, including O-rings, with engine oil prior to installation. The oil application will assist in holding the O-ring seals to the valve cover.
2. Apply a thin coat of silicone sealer at the front and back of the seals.
3. Install the valve cover to the cylinder head, and tighten the bolts to 71 inch lbs. (8 Nm).
4. Route the spark plug wires into the retainers, and install the plug boots to the spark plugs.
5. Replace the intake manifold and the intake plenum.
6. Connect the negative battery cable.

LEFT

1. Disconnect the negative battery cable.
2. Remove the intake plenum and the intake manifold.
3. Remove the spark plug boots from the spark plugs, and then the wires from the routing retainers. Make sure they are tagged for proper installation.
4. Remove the oil filler spout.
   1. Unlock the tab.
   2. Twist counterclockwise.
   
   
5. Remove the rocker arm cover-to-cylinder screws, the cover, and the gasket/seals. Discard the seals.

NOTE Ensure all eight sealing O-rings are accounted for. They may stick to the camshaft bearing caps or fall into the oil return journals in the cylinder head.
To install:

1. Install new valve cover seals. Lightly coat the new seals, including O-rings, with engine oil prior to installation. The oil application will assist in holding the O-ring seals to the valve cover.
2. Apply a thin coat of silicone sealer at the front and back of the seals.
3. Install the valve cover to the cylinder head, and tighten the bolts to 71 inch lbs. (8 Nm).
4. Install the oil filler spout.
   1. Insert the spout and twist clockwise.
   2. Ensure the locking tab seats on the valve cover bolt head.
   
   
5. Route the spark plug wires into the retainers, and install the plug boots to the spark plugs.
6. Replace the intake manifold and the intake plenum.
7. Connect the negative battery cable.

INTAKE MANIFOLD REMOVAL & INSTALLATION

3.0L Engine
This vehicle uses a sequential multiport fuel injected engine. Fuel injector connectors must be positioned onto their appropriate fuel injector or engine performance and exhaust emissions may be seriously affected. Fuel injector connectors are numbered to match their cylinders.

1. Remove the intake plenum.
2. Properly relieve the fuel system pressure.
3. Remove the fuel supply and fuel return hose from the fuel rail.
4. Fuel injector electrical harness connector.
5. Remove the intake manifold bolts and the intake manifold.

NOTE Mask off the ports to the intake manifold spacer. If foreign objects enter the engine, severe damage may result.
Clean the intake manifold sealing surfaces with a non-abrasive tool or solvent.
Do not damage machined aluminum surfaces or improper sealing may occur.

Fig. Location of the guide pins for the intake plenum-3.0L engine

Fig. Intake plenum-to-intake manifold mounting

Fig. The intake manifold bolt locations
To install:

1. Remove the masking from the intake ports.
2. Install the intake manifold, and tighten the intake bolts to 15 ft. lbs. (20 Nm), rotating the tightening sequence.
3. Reconnect the fuel injector electrical harness connector.
4. Couple the fuel supply and fuel return hose,. Tighten the connection to 11 ft. lbs. (15 Nm).

NOTE Counterhold the connections to prevent damage to the fuel rail.

1. Install the intake plenum.
2. Connect the negative battery cable.

REPLACE THE FUEL INJECTOR CANT REBUILT IT.IF YOU REMOVE FUEL INJECTORS FUEL RAIL YOU HAVE TO REPLACE GROMMETS AND O RINGS ON ALL THE FUEL INJECTORS IF NOT YOU WILL HAVE A INTAKE LEAK AT THE OLD FUEL INJECTORS SEALS.REPLACE THE FUEL INJECTOR YOU REBUILT THEY HAVE TO BE REPLACED.

Check this procedure about V8 3.9L Fuel Injectors - Removal & Installation

1. Before servicing the vehicle, please familiarize yourself with safety procedures.
2. Relieve fuel system pressure.
3. Remove or disconnect the following:
   Negative battery cable Engine appearance covers Fuel lines Fuel pressure regulator Fuel cross over elbow Fuel injector connectors Fuel injector clamping plates Fuel injectors

To install:

1. Install or connect the following:
   Fuel injectors. Use new O-ring seals. Fuel injector clamping plates Fuel injector connectors Fuel cross over elbow Fuel pressure regulator Fuel lines Engine appearance covers Negative battery cable
2. Start the engine and check for leaks.
   

1. Before servicing the vehicle, please familiarize yourself with safety procedures.
2. Disconnect the negative battery cable.
   CAUTION The engine appearance cover is equipped with a noise suppressor. If the noise suppressor becomes separated from the engine appearance cover it must be positioned on the intake manifold prior to installing the engine appearance cover.
3. Remove the engine appearance cover and the noise suppressor, if detached.
4. Remove the air cleaner outlet pipe.
5. Release the fuel system pressure.
6. Remove the four engine appearance cover mounting bracket nuts and the brackets.
7. Disconnect the fuel pressure sensor electrical connector from the sensor.
8. Disconnect the fuel pressure sensor vacuum connector from the sensor.
9. Disconnect the eight fuel injector electrical connectors from the injectors.
10. Disconnect the fuel temperature sensor electrical connector from the sensor.
11. Disconnect the fuel supply tube retaining clip from the fuel injection supply manifold.
12. Disconnect the fuel supply tube spring lock coupling.
13. Remove the four bolts and the fuel injection supply manifold and fuel injectors as an assembly.
14. Remove the fuel injectors from the fuel injection supply manifold.
    CAUTION Use O-ring seals that are made of special fuel-resistant material. Use of ordinary O-ring seals can cause the fuel system to leak. Do not reuse the O-ring seals.
15. Remove and discard the 16 O-ring seals from the fuel injectors.
    
    
    

    Fig. Exploded view of the fuel injector mounting-3.9L engine shown
    

To install:

1. Lubricate the new fuel injector O-ring seals with clean engine oil before installing.
   CAUTION Use O-ring seals that are made of special fuel-resistant material. Use of ordinary O-rings can cause the fuel system to leak. Do not reuse the O-ring seals.
2. Install sixteen new O-ring seals onto the fuel injectors. Lubricate the O-ring seals with clean engine oil prior to installation.
3. Install the fuel injectors and clips onto the fuel rail.
4. Install the fuel rail and injectors as an assembly. Tighten the fuel rail bolts to 89 inch lbs. (10 Nm).
5. Install the remaining components in the reverse order of removal.

Keep us updated.

this is called black death, you have an injector seal gone on one or more injectors, the tar stubstance is diesel, injector seals need replacing.

head gaskets do not "dry out"
running rough indicates injector problems --stale fuel dirty injectors or sticking injectors
run the fault codes to determine fault area
oil around spark plugs indicates that the rocker cover seal under the plug tube is leaking into the plug area