I've had this issue before and it was resolved for some months, by replacing the sparkplugs, but the oily sparkplug threads is a new development or at least a lot more pronounced now. I have been using an OBD reader to cope with the intermittent ESP fault, but the issue is too persistent now and the unreliability of the car is too great.
SOURCE: I have a 1995 Lexus LS400 with persistant P0302
try removing and cleaning the mass air flow meter as this controls the fuel delivery if problem persists replacing the distributor might be the solution the pick up plate inside could be bad.
SOURCE: sparkplug wiring for 1995 chevy suburban
Your engine rotates counterclockwise. In that case you install your wires counter clockwise on the distributor. The number 1 connector on the distributor cap is marked 1. You connect the number 1 wire which is the one in the left side. Then go counterclockwise connecting them in this order.
1, 8, 4, 3, 6, 5, 7, 2
SOURCE: When I removed #4 sparkplug there is oil on
If oil is on the spark plug tip then it could be from worn valve stems or from worn piston rings. When you accelerate away from the traffic lights and the engine blows a lot of greyish smoke then this is a sign of worn parts.
If the oil is leaking into the spark plug hole, then it could be leaking from the tappet cover, either the tappet cover bolts are loose or the tappet cover gasket is faulty.
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