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Silviu

Silviu 4/27/2019

1998 Jeep Wrangler (TJ) SE 4 Cyl 2.50L

Engine

O2 sensor and spark plugs gets full carbon deposit fast

Hello,
Ive changed 2 times the o2 sensor and the spark plugs in 6 months. In 3 monthis the o2 sensor and the spark plugs gets full of carbon, can someone help with some advise please ?

1 Answer


Jimm

Jimm 10/6/2019

Many things will do it. Are the plugs wet or oily? It not firing hot will do it, poor plug wires, bad cap and rotor. Weak coil, low voltage to the coil. Over loading with fuel, poor compression, leaking seals, leaking injectors.

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