Engine light/rough running
#1
Engine light/rough running
2009 JCW R55
Just had the light come on and it's running very rough, no power. I pulled these codes, any ideas where to start? Perfect timing since it's about 15 deg out now.
Plugs changed recently, HPFP replaced as well.
cheers
Monitoring Ignition
Code: 00273E
Misfire, a plurality of cylinders: injection is switched off
Code: 002781
Misfire, cylinder 3: injection is switched off
Code: 002775
Misfire, cylinder 1: Injection is switched off
Code: 002772
Just had the light come on and it's running very rough, no power. I pulled these codes, any ideas where to start? Perfect timing since it's about 15 deg out now.
Plugs changed recently, HPFP replaced as well.
cheers
Monitoring Ignition
Code: 00273E
Misfire, a plurality of cylinders: injection is switched off
Code: 002781
Misfire, cylinder 3: injection is switched off
Code: 002775
Misfire, cylinder 1: Injection is switched off
Code: 002772
#3
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#9
Sad update. Had the dealer do it, cost a fortune. Two days ago it did the same thing again. Good news is it's under warranty for the repair, bad news is they need to know why it did it. The car has a slightly bigger turbo and a mild tune, def not trying to push the envelope. This was just a more cost effective way of replacing the factory turbo, dealer suggested. Any thoughts appreciated.
#11
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#15
No clear evidence of anything last time. This time they think possibly the electrode from plug broke off (it was gone) and created the hot spot on the valve. No coolant/overheating issues that I'm aware of. Maybe both cylinders were acting up, seat leakage?, and the other just won the race? I'm lost in what might cause this.
Supposedly complete, proper rebuild. All new parts-valves replaced, head checked, lapped.
Supposedly complete, proper rebuild. All new parts-valves replaced, head checked, lapped.
#16
If the spark plug broke off, there couldn't be a hot spot - there's not going to be combustion!
I am thinking a blockage downstream or lack of fuel causing a lean condition. Although, a bad lean condition would've been reported by the O2 sensor, so I am back to downstream obstruction like a clogged cat. Lack of lubrication wouldn't cause exhaust temp to go up like that.
I am thinking a blockage downstream or lack of fuel causing a lean condition. Although, a bad lean condition would've been reported by the O2 sensor, so I am back to downstream obstruction like a clogged cat. Lack of lubrication wouldn't cause exhaust temp to go up like that.
#17
Maybe heat caused the plug tip to come off? A bad injector(s), maybe lean in 1 or 2 cylinders, but not enough to trip O2 sensor? I've had a clogged cat in another vehicle before, it was super obvious in running, bogged down like it had a ½" exhaust pipe on it. Oil level is always checked and never low, not that it couldn't be a blocked passage somewhere I guess?
#18
If it got hot enough to break the spark plug, then that is a symptom and not the cause. It still doesn't explain why, and I wouldn't let your mechanic charge another dime until he can come up with an explanation that makes sense under scrutiny. The O2 sensor *should* let you know before it becomes so lean you have a problem, but I am guessing - it is logical to leave this option on the table then. Going back a couple steps, why did you replace the HPFP in the first place? Reading in between the lines, this was done prior to all of these symptoms? If that was replaced due to a bad diagnosis of the current problem, there may be some older clues as to what happened.
#19
I agree on the plug. They clearly missed some element. Whatever they are doing related to this job is covered under warranty at least. O2 sensor is fairly new, last summer. HPFP was replaced under warranty in Sept. I had rough idling and low pressure at fuel rail. Testing by dealer confirmed.
ps thanks for the info back and forth btw
ps thanks for the info back and forth btw
#20
Thanks for letting me! This is always good practice for me. My automotive background is very strong but also very conceptual and lacking in hands-on experience, so feel free to call me out on anything and I'll try to be clear when I am assuming. That being said, I was working at Bosch when BMW started racing the N20, so I did the ECU software for the GrandAm (or whatever the series called itself) program at the time.
Going back to the low fuel pressure, that can cause a burned valve, but having the dealer confirm the bad pump is a big point. Maybe the new pump went bad for the same reason? It could be that the low pressure pump isn't running well, and this could result in cavitation (where the fuel in the high pressure pump starts to boil in the suction stage). Over time, this can cause HPFP failure.
Going back to the low fuel pressure, that can cause a burned valve, but having the dealer confirm the bad pump is a big point. Maybe the new pump went bad for the same reason? It could be that the low pressure pump isn't running well, and this could result in cavitation (where the fuel in the high pressure pump starts to boil in the suction stage). Over time, this can cause HPFP failure.
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