phil04
NAXJA Forum User
- Location
- Riverview, FL
01 XJ 4.0 Auto 4x4 178k
I have read countless misfire threads but none seem to address the situation I have:
From start up rough idle, though it seems to get more rough as the vehicle warms up (it will actually move you).
When in closed loop, if I allow the vehicle to decelerate while in drive, either through just taking my foot off the gas or applying brakes, for around 8 seconds I get a flashing cel. Start giving it gas and the light stops flashing after a few seconds. Occasionally it goes into limp mode after and I have to restart the car.
I have been throwing it into neutral as I come to stops or have a prolonged deceleration to avoid the flashing cel. Anyone have a good idea of what this might be?
Codes: Misfire cyl 1, 4, 6. We drove it with the code reader and most misfires detected were from cyl 1. It actually just kept counting while driving normally.
I did replace my transmission about 2 months ago and a mechanic mentioned the possibility of a bent flex plate window for the crank sensor but i'm not sure the symptoms fit.
I have also tried two different crank sensors with no change.
New plugs and thermostat.
Fuel pressure was good and passed leak down test.
Mechanic never checked vacuum because he was confident it wasn't a potential cause, but I am not so sure since during deceleration you are at your highest vacuum and that is when I get enough misfires to get the flashing cel.
Thanks so much for any help! This is driving me crazy and the mechanic at jeep let me know he would be happy to throw parts at it but has no clue what the cause is. Luckily I managed to get about 2 hrs worth of "troubleshooting" for 50 bucks.
I have read countless misfire threads but none seem to address the situation I have:
From start up rough idle, though it seems to get more rough as the vehicle warms up (it will actually move you).
When in closed loop, if I allow the vehicle to decelerate while in drive, either through just taking my foot off the gas or applying brakes, for around 8 seconds I get a flashing cel. Start giving it gas and the light stops flashing after a few seconds. Occasionally it goes into limp mode after and I have to restart the car.
I have been throwing it into neutral as I come to stops or have a prolonged deceleration to avoid the flashing cel. Anyone have a good idea of what this might be?
Codes: Misfire cyl 1, 4, 6. We drove it with the code reader and most misfires detected were from cyl 1. It actually just kept counting while driving normally.
I did replace my transmission about 2 months ago and a mechanic mentioned the possibility of a bent flex plate window for the crank sensor but i'm not sure the symptoms fit.
I have also tried two different crank sensors with no change.
New plugs and thermostat.
Fuel pressure was good and passed leak down test.
Mechanic never checked vacuum because he was confident it wasn't a potential cause, but I am not so sure since during deceleration you are at your highest vacuum and that is when I get enough misfires to get the flashing cel.
Thanks so much for any help! This is driving me crazy and the mechanic at jeep let me know he would be happy to throw parts at it but has no clue what the cause is. Luckily I managed to get about 2 hrs worth of "troubleshooting" for 50 bucks.