Intermittent miss scattered, not just 1 cylinder

Tiny
LARRY P
  • 1986 MERCURY STATION WAGON
  • 125,000 MILES

Have 2 canadian-built ford wagons ('86 and '89). Both have 302pfi engines. Both exhibit an intermittent miss at light load (particularly after the trans shifts) which is much more pronounced when warm. Have replaced just about everything in the ignition system, tried disconnecting the egr valve, cleaned the iac motor, all to no effect. Strange thing is, the problem will disappear for a day, a week, or a month and suddenly return with nothing having been done to the car. Absolutely stumped. Any thoughts? Thanks in advance.

Do you
have the same problem?
Yes
No
Friday, July 20th, 2012 AT 7:57 PM

1 Reply

Tiny
KHLOW2008
  • EXPERT
  • 41,977 POSTS

Symptoms indicates the problem most probably is related to the ignition spark system and more likely a loose connection somewhere rather than a bad component.

Was this
answer
helpful?
Yes
No
Saturday, July 21st, 2012 AT 2:04 PM

Please login or register to post a reply.

Other EGR Valve Clean Questions