1997 Pontiac Sunfire number 4 cyclender misfire

1997 PONTIAC SUNFIRE
100,000 MILES • 4 CYL • 2WD • AUTOMATIC
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DERRICK4HIM
  • MEMBER
  • 2 POSTS
#4 cyclender misfire keeps coming up on the computer. I have already changed the plugs spark boots and coils. This is my daughter's car. She had lost the gas cap for a couple weeks inwhich it rained a lot. I had her put fuel treatment in and get a new cap but no luck yet. Any suggestions?
Aug 20, 2010 at 9:11 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
Since you refer to spark plug boots, I assume this is a quad4. What you need to replace is the white plastic coil housing. On that engine that works like a distributor cap and they can crossfire very easily. I have been there many times.
Aug 20, 2010 at 9:16 AM
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DERRICK4HIM
  • MEMBER
  • 2 POSTS
[quote:0a33cae127="Wrenchtech"]Since you refer to spark plug boots, I assume this is a quad4. What you need to replace is the white plastic coil housing. On that engine that works like a distributor cap and they can crossfire very easily. I have been there many times.[/quote:0a33cae127]



thanks
Aug 20, 2010 at 1:53 PM
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