08-31-2021, 06:24 AM | #1 | |
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Stock B58 - misfire, loose spark plugs, fuel in plug tubes
I recently started my car and started driving down my driveway. High pitched noise like a kettle, smoke following me down the driveway. I called and took it to the dealership, believing it was the crank case valve -- easy enough
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08-31-2021, 09:01 AM | #2 | |
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08-31-2021, 09:38 AM | #3 | |
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08-31-2021, 10:01 AM | #4 |
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can't explain loose spark plugs but injector failures happen from time to time.
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08-31-2021, 10:55 AM | #5 |
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After speaking with the service guy over the phone. He believes the fuel went past the spark plug and above it. The looseness was only 22NM compared to 23-24. That sounds like normal wear looseness to me. Hard to believe fuel would have gotten past. Im thinking the injectors went sour and it's injecting too much or too little; too late or too soon.
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08-31-2021, 12:09 PM | #6 |
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On the N55 the spark plugs would get loose by themselves. Haven't heard that happen to a B58. And loose means you can turn it by hand with a socket on an extension. 22NM doesn't sound loose to me. Even with loose plugs on a N55 fuel would not blow up past the spark plugs. You have to realize that the engine is hot. How would fuel in that area not evaporate even with the coil boot on. A screeching and smoke could also be a blown turbo if not the PCV.
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08-31-2021, 12:14 PM | #7 | |
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You raise a good point about the fuel evaporating though. I'm curious what they saw or how they identified the fuel. I'm feeling like this is a solution in need of a problem and expensive one at that. The findings of a failed injector leaving fuel that somehow makes it past the spark plug and never evaporates or burns in the process is a bit much to buy into. |
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08-31-2021, 12:57 PM | #8 |
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22Nm is not a blown out plug. Fuel in the well could be fuel from a hydrolocked cylinder getting past the injector seals or better chances the injector was not properly seated to the fuel rail. Logs should tell you where your fuel rail pressure is going. How much fuel was in the well. Fuel in the engine is not safe: Engine fire. What color was the smoke and was the smoke from the exhaust or engine hood?
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08-31-2021, 01:04 PM | #9 | |
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I do not know exactly how much fuel was in the well, but I will ask the shop to be more specific when they call back Would a hydrolocked cylinder not be more catastrophic? Something that would have been more noticeable over the last 5-10k miles? |
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08-31-2021, 01:52 PM | #10 | |
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08-31-2021, 01:54 PM | #11 |
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I am not a fan of dealers for this stuff, unless you are under warranty. Find a good local BMW indy shop. If you are near Albany, NY I can recommend a very good BMW-only shop.
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08-31-2021, 03:14 PM | #12 |
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Update: cyl 1 and 6 misfired. Those two have fuel residue in the spark plug passage. The understanding is that fuel from the injector, likely where it is seated in the fuel rail, came down into that passage(?)
Labor rate: $142.50/hr Injectors: $410/ea Yikes. |
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09-01-2021, 08:00 AM | #13 |
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As said before an injector going bad is not uncommon. But find an indy to do the work, not the dealer. It's more likely you have a leaking valve cover gasket letting oil in the area than fuel "residue". A new injector from ECS costs $280, not $410. Should take less than an hour to swap in 2 new injectors.
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09-01-2021, 08:30 AM | #14 |
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Personally, I would just do the spark plugs my self. Getting 5/6 of them is easy, 6th one requires taking off a bunch of screws; but, still relatively easy. You can also see if you can provide the parts and they'll do the labor. I haven't done the fuel injectors but that doesn't seem too difficult either if you just have the correct wrenches and bits/sockets.
Think about the bright side, it's nice to hear the issue is not as bad as major engine work that can cost 3-4k |
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09-01-2021, 09:48 AM | #15 | |
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09-02-2021, 07:50 AM | #16 |
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Hearing back form the shop, "... spoke with the shop foreman and he printed for me the diagram of the engine cover, which the crankcase vent valve is part of. I've circled it in the attachment to this e-mail, but it's not replaceable, it's part of the cover itself. In regards to the misfire, the counter maxed out, so it didn't give us a specific number of misfires, but yes, it's been consistent."
Sounds like the two injectors are fried but the dealer is really screwing me with costs. My concern is that if I take it elsewhere at this point, they're going to pin me with some hundred dollar fee for the diagnosis making it pointless to go somewhere else in the first place. Saying the valve is irreplacible aslo concerns me because as far as I can tell thats simply incorrect. |
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09-02-2021, 12:24 PM | #17 |
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They go by what BMW says and that is the VC is not serviceable. Doesn't mean some aftermarket company didn't made it serviceable. The dealership will probably charge $150 for the service. That's less than the overage they are charging on one injector. You would probably still be better off to take it to an indy.
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09-02-2021, 12:41 PM | #18 | |
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Anyone have a good source for that valve/diaphragm? |
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09-02-2021, 04:13 PM | #19 | |
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09-06-2021, 08:19 AM | #20 | |
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Such as this? I'm sure you can get my hesitance with a shitload of a listings for a fairly ambiguous rubber bit sold from loads of eastern block countries. A rubber bit whos failure could have detrimental results to my very expensive engine.... Odd that many don't come with the cover or spring. Shame BMW or a trusted vendor doesn't sell it. |
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09-15-2021, 08:19 AM | #22 |
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The eBay PCV diaphragm and cap are fine. Otherwise you need a new valve cover which I think is over a thousand for just the part alone. The dealership will charge you a diagnostic but they may charge one anyway if you go ahead with the work. I would ask them to present me with the bill if I went with the dealership and what a bill looks like if I take it for a second opinion. Then I would haggle with the dealership to get the cost down on the injector replacement. The thing is, the issue may not be with the injectors but its safer for the dealership to replace them (bad injectors can possibly destroy your engine) since they guarantee their work so they will always go the safe route and of course injector replacement is alot of money. If they will not go lower, I would ask around and see if indys can do it for less. Keep in mind most indys source from dealership parts departments and not ECS. They do get a slight discount but it may not be as low as ECS sale prices and they tend to want to keep that discount if you know what I mean.
Steve, you don't need to replace the PCV until it shows issues and is mostly fine for people who don't push higher than stock boost. |
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