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New Member
- Joined
- Jan 25, 2009
- Messages
- 16
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 97
- Make / Model
- ranger
- Transmission
- Automatic
My 4.0 started to run a little rough at idle about a year ago but not too bad.
Changed plugs, and filters, the IAC, and cleaned the map sensor with no results
Then it started to stumble occasionally under load a few months ago and progressively has gotten worse to the point of backfiring.
With no load on level ground though it ran smooth.
Changed out the plugs and wires yesterday and now it starts up and runs smooth at high idle until it kicks down and then just backfires constantly.
Any ideas where to start?
No codes are being thrown except and occasional 0442 when I park on a hill.
Checked compression with all cylinders good maybe 1 was a a few lbs lower...
Changed plugs, and filters, the IAC, and cleaned the map sensor with no results
Then it started to stumble occasionally under load a few months ago and progressively has gotten worse to the point of backfiring.
With no load on level ground though it ran smooth.
Changed out the plugs and wires yesterday and now it starts up and runs smooth at high idle until it kicks down and then just backfires constantly.
Any ideas where to start?
No codes are being thrown except and occasional 0442 when I park on a hill.
Checked compression with all cylinders good maybe 1 was a a few lbs lower...
