Code P0303 (Ignition systems) & Code C1201/51 (Engine control system)
My 2011 xD threw the following codes this AM at ~133,233 miles:
Code P0303 (ignition systems) Code C1201/51 (engine control system) The symptom -- minor surging when under load, as well as when stopped) -- began yesterday. Plugs and coils were replaced at 124,688 and the vehicle has been running nominally until now. Code P0303 points to ignition coils, spark plugs and intake manifold gasket. I believe that cylinder 3 is potentially the culprit. (Is that the 2nd coil on the left or right when facing the engine bay?) Code C1201/51 refers to an engine control system malfunction signal which continues for 1 second or more. Please let me know if you can shed any additional code definitions and/or any ideas regarding where to start troubleshooting after the #3 coil is checked? Cheers! |
Most engines number the cylinders from the driver side and front to back.
|
Originally Posted by DAlex
(Post 4283369)
Most engines number the cylinders from the driver side and front to back.
I'm going to switch the coil from cylinder #3 with #4 and see if the code changes. If that does not occur, I will switch the plug from cylinder #3 with #1 and see if the code changes. If that does not occur, perhaps the suspect is a stuck fuel injector in #3... More shall be revealed later today... |
OK, if you had accidentally mis-attached coils, your engine would've been running like a washing machine with a bowling ball in it. A mis-wired 4 cylinder is NOT subtle; Harley Davidsons idle smoother! If a coil had been mis-attached, your motor would make loud backfires, and would idle rough enough to be heard from 1000' away. Your recurring rough idle is much less severe.
|
To complete the loop:
The practically new (Denso Iridium) plug with ~7,500 miles that was in cylinder #3 was bad. To troubleshoot I moved it to cylinder #2 and sure enough code P0302 was recorded. I purchased a Bosch Iridium plug at O'Reilly's and installed it and all is well...fingers crossed... |
Originally Posted by DAlex
(Post 4283543)
OK, if you had accidentally mis-attached coils, your engine would've been running like a washing machine with a bowling ball in it. A mis-wired 4 cylinder is NOT subtle; Harley Davidsons idle smoother! If a coil had been mis-attached, your motor would make loud backfires, and would idle rough enough to be heard from 1000' away. Your recurring rough idle is much less severe.
|
All times are GMT. The time now is 07:17 PM. |
© 2024 MH Sub I, LLC dba Internet Brands