AceOnGuitar
Member
- Joined
- July 8, 2005
- Messages
- 11
- Reaction score
- 0
- City, State
- Cisco, Texas
- Year, Model & Trim Level
- 1999 Sport
Hello everyone,
I have a '99 Explorer Sport with a 4.0 V6 and 183,000 miles. A few months ago I started having a misfire when I first started it up, but it went away after a few minutes. After a while, it misfired all the time. So I changed the plugs and wires, and it stopped the constant misfire, but still misfired on a cold start. Recently on a longer trip, it started misfiring off and on. It would run good then run bad. It never got hot, but it would misfire for a few minutes then run good for a few minutes. It still does it after two bottles of fuel cleaner. The check engine light came on and the codes were: 171, 174, and 303. I understand that the code 303 is a misfire, and the other two codes are system running lean. I have to note that I hit a deer in 2005 and the vacuum ball shattered, and so the lines are just spliced together. Could the misfire be caused by a vacuum problem?
There is no water in the oil, and it does not smoke. It hasn't used any water or oil.
Please help!
Thanks in advance,
Chris
I have a '99 Explorer Sport with a 4.0 V6 and 183,000 miles. A few months ago I started having a misfire when I first started it up, but it went away after a few minutes. After a while, it misfired all the time. So I changed the plugs and wires, and it stopped the constant misfire, but still misfired on a cold start. Recently on a longer trip, it started misfiring off and on. It would run good then run bad. It never got hot, but it would misfire for a few minutes then run good for a few minutes. It still does it after two bottles of fuel cleaner. The check engine light came on and the codes were: 171, 174, and 303. I understand that the code 303 is a misfire, and the other two codes are system running lean. I have to note that I hit a deer in 2005 and the vacuum ball shattered, and so the lines are just spliced together. Could the misfire be caused by a vacuum problem?
There is no water in the oil, and it does not smoke. It hasn't used any water or oil.
Please help!
Thanks in advance,
Chris