Misfire And Not Sure What To Try Next?
#1
Misfire And Not Sure What To Try Next?
Out of nowhere my 04 4.6l V8 has started misfiring sporadically with a very violent rough idle. This only seems to happen whilst 'coasting' around a corner, at idle / stopped at lights, or after I reverse up my drive (slight gradient).
I can get around 50 misfire counts in a matter of seconds and only on cylinder #5. Some days I'll drive for 20 minutes and get 300 misfires, other days that can be as much as 1500 misfires. All other cylinders seem to be fine.
I have had a rich code triggered on bank 2 at -37.5% fuel trim. I can smell gas when it starts to idle rough.
So far, I have tried the following:
- Swapped all injectors between banks (injectors were new motorcraft around 10k miles ago).
- Swapped coils from cylinder #5 to #1.
- Installed new plugs.
- Compression and idle cylinder balance is pretty even and fuel trims are perfect (according to my mechanic).
Neither me nor my mechanic knows where to go next with this and I feel that my cats are getting a beating from this... Any suggestions?
I can get around 50 misfire counts in a matter of seconds and only on cylinder #5. Some days I'll drive for 20 minutes and get 300 misfires, other days that can be as much as 1500 misfires. All other cylinders seem to be fine.
I have had a rich code triggered on bank 2 at -37.5% fuel trim. I can smell gas when it starts to idle rough.
So far, I have tried the following:
- Swapped all injectors between banks (injectors were new motorcraft around 10k miles ago).
- Swapped coils from cylinder #5 to #1.
- Installed new plugs.
- Compression and idle cylinder balance is pretty even and fuel trims are perfect (according to my mechanic).
Neither me nor my mechanic knows where to go next with this and I feel that my cats are getting a beating from this... Any suggestions?
#2
Senior Member
Have you checked the condition of your FPDM?
#3
#4
Mark
iTrader: (1)
What about the COP and or boot and spring ?
#6