I have replaced both coil and plugs together. Does not cost much and you are in the same spot . 300 bucks extra won't break your bank.I have replaced all 6 spark plugs on my 2012 X5. Unfortunately, I'm still getting the cylinder misfire detected codes. Should I also replace the ignition coils?
Thank you in advance
Well, if it were a coil issue, sure. But you dont get 3,4 coils all failing simultaneously.I have replaced both coil and plugs together. Does not cost much and you are in the same spot . 300 bucks extra won't break your bank.
Great read, thanks for sharing. Coils ordered and will be replaced on Tuesday. I'll keep you guys posted.Just did a quick search here for misfire and hpfp... found:
Interesting reading, might be useful...a Link:
There are lots of things that can cause a random misfire, which is why I wouldn't go replacing the coils just yet. Chances are, unless highly neglected, not all your spark plugs and coils would fail at the same time. There has to be a commonality for that effect, and the good thing is, there is a finite list of issues that will cause all cylinders to misfire. Let's take a step back and evaluate. The first question, can you physically detect the misfire? I.e. does the engine shake, when sitting in the vehicle can you feel the shake, can you hear it in the exhaust? Have you cleaned your MAF? Do not use carb cleaner. It is sensitive, so use only MAF cleaner spray, and do not touch the MAF element or wire.
In your particular case, I'd venture a guess that you may indeed have a fuel pressure issue. You replaced the sensor but you may still have low fuel pressure. Why on earth did you replace the sensor though? Only replace the sensor if the computer tells you you have low pressure and there is no other problem. Otherwise, it's most likely still good. Get a fuel pressure gauge and take a reading. Read the pressure before and after the fuel pressure regulator. That will determine if the regulator is good. Remedy if not. If you have neglected your fuel filter, change that also.
If the misfire is still there and fuel pressure is normal, get a good scanner and check your oxygen sensors' function. The upstream o2 sensor readings will fluctuate and is what the computer uses to compensate fuel delivery. If your o2 sensors are dead, stuck, or just lazy, it will cause random misfires. The downstream o2 sensor determines your catalytic converter's efficiency. If your downstream sensor readings fluctuate, your cat is no good. If it reads too lean, the cat is clogged. A clogged catalytic will build enough backpressure to cause random misfires or even stall your engine.
Check your wiring harness to the coils. The computer uses at least one (sometimes two) wires to determine whether a coil fired. If this wire is broken, the computer will take it as a misfire because it cannot detect a successful fire.
The list of causes go on, but I doubt there is a need to expound further.
Hey, you are willing to try and learn, so keep at it.The car does shake to the point it wants to turn off. I can hear the puttering in the exhaust, but no backfire. I have not cleaned my MAF. I will have to clean that then. I replaced the fuel pressure sensor because that was one of the many things on the list under code P0087. I believe this was the problem because the code has not appeared since I replaced it, not sure though. My X5 is not a diesel, so it does not have a stand-alone fuel filter. It is part of the HPFP. Would the fuel pressure gauge reading tell me if I have a bad HPFP? I have been using a generic foxwell scanner. I ordered a BMW specific scanner and I will get it on Sunday. I will then scan it again and see more details. I will let you know what I see. Please bear with me. I am a prosthetist/orthotist and I see patients for artificial limbs and braces. I am not a mechanic by any means, but I am following so far.
I will hold on to the coils. I will check the following and return them since I have a 90 days return.
Not to be read as a caveat, but more of a process of elimination from the easiest/cheapest thing to more difficult/more expensive thing.Hey, you are willing to try and learn, so keep at it.
While I appreciate Wolf's somewhat methodological approach, he caveats' the whole O2/CAT thing with "if your fuel pressure is OK". You had fuel pressure codes. (Could just be you havent driven enough. Harder driving might increase fuel demands to then trip a FP code. Assume your are babying...)
LMAO. Panic is right! I told my wife. We have some serious problems. hahahahalol. Yes, the panic.
I think you can move to each of those line items, hit enter and you will see what the codes are.
Those are all the codes since the last reset. COuld be years worth of faults. COuld be a slew of faults around someone letting the battery run down and needing to jump it. Who knows.
I would look up ALL the faults, document them. Write them down. (Yeah, you can take pictures but at some point they ought to be collected in one spot, not pictures on a phone. Few people will look at images for you to find the fault so that can look it up...just saying)
Then clear all your codes. Drive it, see what comes back.
To your question, the main issue is the ECM errors. looks like there are 20. Go to that section. Tell us what they are, so the thread is updated.
Then let us know what comes back