I got the check engine light on my way home. But it didn't stay on, just flashed once. Got home, read the codes, pulled all the plugs and replaced them. There was a definite misfire in cylinder 3, but the rest looked ok.

Fired it up this morning and the same codes were being thrown. Idle still seems a little lumpy.

Is replacing the coil packs next? That seems a little absurd as my car only has 42,000 miles on it.

Any ideas? Thoughts?

Thanks,
Aaron

 

Still need some ideas. I just finished sea foaming it and it did nothing. It still runs rough and I can feel it misfiring.

 

Move coils around.

See if codes follow.

Seafoam will not remove bad carbon buildup, but is more of a preventative measure.

 

I did that and things didn't change.

 

Any rotational noise of any kind frm engine.

 

Rotational as in?

 

Those are misfire codes. Start with plugs and wires that is the easiest to check. After that more diag will be needed.

 

Way-

I changed the plugs. Can you change an r55s wires? I thought you'd change the coils, but they turned out to be fine.

 

Just got the 2097 code too.

So to recap: 300, 301, 303 & 2097. I bought new plugs, and switched up the coil packs and nada. Still runs lumpy and throws codes.

 

You're at about the mileage when the high pressure fuel pump often starts to go (resulting in symptoms that include cylinder misfires). Do you have any issues with cold starts? If so, that's likely the problem. If not, the other advice is where I'd start.

 

Cold starts were no problem. Since I moved the coils around and the code didn't follow the coils, maybe I'll do a compression check? I can double check the wires and see. Where would I check the wires though? From the coil packs to where?

Thanks for the help you guys!

 

I talked to my friend where I bought the car and he pulled the records and said the valve cover gasket had been replaced. Could maybe this be causing a misfire? Thoughts?

I'm about two seconds away from throwing in the towel and going to dealership.

 

Correct me if I am wrong, but aren't the 300 codes misfires , and the 2097 Code an over-rich code at the post CAT O2 sensor?

So what about a carbon clean? Has the intake been inspected?
E.

 

Dealer says- no compression in cylinder #3, at all. It seems to share compression with #2. Possible warped head, and or blown head gasket. Lots of carbon build up.

Crap. I just bought the car in Sept. This is turning out to be a rather large job.

 

Hopefully it's just carbon buildup.

 

If there's no compression in cylinder #3, and it shares compression with #2, could it just be a head gasket? Or is it the head? I know the only way to really know is to pull the head and examine it, but I am asking in case anyone else here has had the same issues.

 

Update- my engine had a burnt valve. Needed a new head and valves. I about **** my pants after having the car for only a month and a half and the warranty expired. I have to say MINI cane through and warrantied the whole head and valves. My SA at MINI was the bomb.