Rough idle
#1
10-11-2018, 10:05 PM
Rough idle
2004 5.7 hemi with high mileage. Starts with no problem, but has rough idle which smooths out at higher rpm. No odd noise from engine. Pulled plugs and they are black & wet. Exhaust is white when accelerated & smells of fuel.
No loss of coolant, No loss of oil. No codes.
Now - clogged cats? Valve issue? O2 sensors? What else????
No loss of coolant, No loss of oil. No codes.
Now - clogged cats? Valve issue? O2 sensors? What else????
#2
10-12-2018, 08:30 AM
#3
10-12-2018, 01:16 PM
Clue #1 - wet spark plugs - spark plugs should not be wet. This indicates that fuel is not being ignited.
Clue #2 - fuel smell in exhaust - This is also a sign that fuel is not being burned properly
Clue #3 - high mileage - Could point to a burned out ignition coil
Possible Causes:
1. First thing I would do is replace the spark plugs. Make sure they are properly gapped.
2. Second thing would be replace the ignition coils. Could be bad with really high mileage
3. Third, anything more serious than this would need a diagnosis by a technician.
Good luck. Let us know what you figure out.
Clue #2 - fuel smell in exhaust - This is also a sign that fuel is not being burned properly
Clue #3 - high mileage - Could point to a burned out ignition coil
Possible Causes:
1. First thing I would do is replace the spark plugs. Make sure they are properly gapped.
2. Second thing would be replace the ignition coils. Could be bad with really high mileage
3. Third, anything more serious than this would need a diagnosis by a technician.
Good luck. Let us know what you figure out.
#5
10-17-2018, 04:57 PM
