Number 4 cylinder fouling plug from fuel

1997 SATURN SC2
200,000 MILES
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JOHN611
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Have good compression getting fuel and spark but number for cylinder keeps fouling the plug. New plugs wires TCP sensor. All other cylinders are good. Compression is 185n that hole. Could injector or fuel pressure regulator be bad
Jun 13, 2013 at 8:09 PM
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SATURNTECH9
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What kind of plugs are are you running?Also are you sure its fuel and not carbon fouling?
Jun 13, 2013 at 9:01 PM
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JOHN611
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Ngk R plugs and not sure if carbon or not. Black sooty looking
Jun 14, 2013 at 1:37 PM
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SATURNTECH9
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
Those aren't platnuim plugs are they?
Jun 14, 2013 at 6:00 PM
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JOHN611
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No they aren't
Jun 14, 2013 at 7:22 PM
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SATURNTECH9
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
Are you burning a lot of oil?Also how quick does the plug foul?
Jun 14, 2013 at 7:39 PM
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