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1997 Pontiac Sunfire number 4 cyclender misfire

Tiny
DERRICK4HIM
  • MEMBER
  • 1997 PONTIAC SUNFIRE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
#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?
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Friday, August 20th, 2010 AT 4:11 PM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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.
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Friday, August 20th, 2010 AT 4:16 PM
Tiny
DERRICK4HIM
  • MEMBER
  • 2 POSTS
Thanks
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Friday, August 20th, 2010 AT 8:53 PM

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