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?
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.
Was this
answer
helpful?
Yes
No
Friday, August 20th, 2010 AT 4:16 PM
Tiny
DERRICK4HIM
  • MEMBER
  • 2 POSTS
Thanks
Was this
answer
helpful?
Yes
No
Friday, August 20th, 2010 AT 8:53 PM

Please login or register to post a reply.

Related Engine Misfire Content

Intermittent Misfire
VIDEO
Intermittent Misfire
Instructional repair video
Misfire Random Code P0300
GUIDE
Misfire Random Code P0300
The world of automotive diagnostics can be complex, with numerous codes and potential issues to keep track of. One of the more common engine diagnostic codes is P0300, which...
VIEW MORE