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Old October 11th, 2021, 13:55
bruceb bruceb is offline
NAXJA Forum User
 
Join Date: Mar 2021
Location: FL
Posts: 6
Re: I going nuts with this issue on my daughters 2000 XJ

I would suggest that once the vehicle stalls, pull the spark plugs and see how they look. This may help direct you into what direction of diagnostics to follow.
  • Light tan spark plug: Good mixture.
  • Dark brown or Black Spark Plug: Too rich
  • Black, oily Spark Plug: Oil fouled (see valves or piston rings.)
  • White, no color on spark plug: Too lean.
  • Good running conditions: If everything is good, the spark plug should have a tan/light brown color.
  • Rich running conditions: If your engine is running too rich, the spark plug will be black and sooty.
  • Lean running conditions: If your engine is running too lean, the spark plug will be white.
  • If the spark plug is black and oily, they are oil fouled.
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