junker68
Member
- Joined
- October 14, 2013
- Messages
- 16
- Reaction score
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- City, State
- Westchester County, NY
- Year, Model & Trim Level
- 2002 Mountaineer
We recently bought a 2002 Mountaineer, 4.6, 120,000 miles.
It has developed a misfire in cylinder 5 and a rough idle while stopped in traffic. There does not appear to be any issues such as a loss of power or performance other than the idle. There may be an issue but I do not notice it when driving, other than stopped in traffic.
So far I have done the following:
Changed the sparkplug in cylinder 5, along with the coil pack and injector - I used Motorcraft on all parts except for the Spark Plug where I used Autolite - Platinum.
Fixed a few vacuum hoses which were in need of repair. I added a can of Seafoam through the tank.
I cleaned the IAC and the MAF.
The IAC was cleaned twice and each time I cleaned it, the rough idle subsided, but did not disappear. The cel light would return in a day or so, when the idle got back to original "roughness."
I was thinking about buying a new Motorcraft IAC, but I wanted to run it by the fine people on the forum first.
Can a bad IAC cause a misfire in a specific cylinder?. Wouldn't it effect the entire engine? From reading past posts, it appears that people who have solved idling issues by replacing the IAC did not really have the same symptoms as me.
Thanks for reading this long post and thanks in advance for any replies.
Dwayne
It has developed a misfire in cylinder 5 and a rough idle while stopped in traffic. There does not appear to be any issues such as a loss of power or performance other than the idle. There may be an issue but I do not notice it when driving, other than stopped in traffic.
So far I have done the following:
Changed the sparkplug in cylinder 5, along with the coil pack and injector - I used Motorcraft on all parts except for the Spark Plug where I used Autolite - Platinum.
Fixed a few vacuum hoses which were in need of repair. I added a can of Seafoam through the tank.
I cleaned the IAC and the MAF.
The IAC was cleaned twice and each time I cleaned it, the rough idle subsided, but did not disappear. The cel light would return in a day or so, when the idle got back to original "roughness."
I was thinking about buying a new Motorcraft IAC, but I wanted to run it by the fine people on the forum first.
Can a bad IAC cause a misfire in a specific cylinder?. Wouldn't it effect the entire engine? From reading past posts, it appears that people who have solved idling issues by replacing the IAC did not really have the same symptoms as me.
Thanks for reading this long post and thanks in advance for any replies.
Dwayne