Misfire with P0301 & P0304 codes
Discussion
Only happend the once after a near rev limit sprint, had a double flash of engine warning light but no feeling of misfire.
As soon as I got home put the OBD2 on the car came up with misfire cylinder 1 & 4
As 1 & 4 fire of the same side of the coil pack I’m thinking either bad connection at the 3 pin plug on the coil pack or 1 side of the coil pack is the issue.
Does this sound right?
As soon as I got home put the OBD2 on the car came up with misfire cylinder 1 & 4
As 1 & 4 fire of the same side of the coil pack I’m thinking either bad connection at the 3 pin plug on the coil pack or 1 side of the coil pack is the issue.
Does this sound right?
Seems to me the error code might have been spurious, or it might be indicating a transient fault. If it doesn't come back my view is if it ain't broke don't fix it. Nothing stopping you buying spares ahead of time if you want, but I suggest you avoid the temptation to try speculative fixes for what may not be a problem - it's easy to end up with maintenance induced failure.
stevieturbo said:
Possibly....but a lot can depend how it determines a misfire.
Is it actually able to distinguish between the two cylinders when it offers a code ? ie it could be any issue on one of those which could be electrical or mechanical.
Good question, I don’t know that’s why I assumed because it showed 1&4 it was a coil based issue Is it actually able to distinguish between the two cylinders when it offers a code ? ie it could be any issue on one of those which could be electrical or mechanical.
I just don’t like seeing engine managment lights flash
To add some context this is the first real drive after an engine swap so I am hypersensitive to any thing
Problem not solved apparently.
New coil pack, plugs, leads and a few weeks later engine light came on, it only seems to happen when I’m giving it the beans and I’m mean near red line stuff and then lift off and hard braking.
The exhaust is a large bore straight through cat back system which pops and burbles, clutching at straws here could that confuse the ecu via the knock sensor which I assume is the only way the ecu can detect cylinder firing.
New coil pack, plugs, leads and a few weeks later engine light came on, it only seems to happen when I’m giving it the beans and I’m mean near red line stuff and then lift off and hard braking.
The exhaust is a large bore straight through cat back system which pops and burbles, clutching at straws here could that confuse the ecu via the knock sensor which I assume is the only way the ecu can detect cylinder firing.
Are you still getting the same codes? I know on my wiring loom coils 1 and 4 are on a single circuit and 2 and 3 on another. With what you have already done I would swap injectors 1 and 4 with 2 and 3, reset and see what happens. If the same fault comes back I'd be looking at wiring which is the fault I had and it showed itself under similar conditions to yours.
P0300 makes sense, especially if there is a wiring fault. Start swapping things about to see if the fault moves and see if you can get a wiring diagram for the car.
Just re-read - 01 and 03 suggest that the fault has already moved from cylinders 1-4 to 1-3?
Just re-read - 01 and 03 suggest that the fault has already moved from cylinders 1-4 to 1-3?
Edited by StoatInACoat on Friday 20th April 12:57
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