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10-04-2017, 01:55 PM | #111 | |
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10-10-2017, 05:49 AM | #112 |
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10-10-2017, 05:57 AM | #113 |
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Alright. Looks like this thread got lots of great discussions going. Lets go another direction now.
Ok.. Now about me. I am the Manufacturer Rep for Launch Scanners for the state of Florida. We have some pretty good coverage in the European vehicles. Nearly factory coverage. So needless to say, its a great tool on BMW. So yesterday i was in a Hyundai dealer speaking to one of the techs there about getting a scanner from his Matco dealer. In talking to him he told me that they have a major recall on ROD BEARINGS going bad on newish vehicles. The fix is to replace the entire long block.. So I asked him how they diagnosis the failure. He said that they put a listening device in the oil dipstick tube and measure the noise level. PRETTY COOL.. This got me thinking. All modern engines have their own listening devices internal. The Knock Sensor... So what I am going to do is hook up one of my Launch Scanners and with the engine on first start I am going to look at the Knock Sensor in Graph mode to see if it picks up any low end noise. It just might be a way to diagnose these types of problems without relying on actually trying to hear it over the already loud engine. It might also be the reason many M3 owners say that their car felt sluggish before they replaced the bearings. Just might be the knock sensor listening to the low end knock and retarding the timing. It's worth me doing a test. Photos to follow later today. Should be fun. Last edited by M_Three; 10-10-2017 at 06:03 AM.. |
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10-10-2017, 06:22 AM | #114 | |
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10-10-2017, 06:36 AM | #115 |
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I am not sure the type of sensor matters really. They are both listening for the same thing and will produce a spike on the graph.. But we shall see as it's just a simple plug in the OBD port.. Gonna do it this morning as I leave for a meeting at BMW of all places.
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10-10-2017, 07:13 AM | #116 |
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Not really, the s65 knock sensors predict knock based on cylinder pressures, whereas traditional knock sensors measure knock after detonation based on noises or the vibrations. They are two different systems for detecting knock.
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10-10-2017, 07:15 AM | #117 |
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I'm sorry to hear that, one day you will realize how much of a waste it is going to a dealer for anything other than warranty or recall work.
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10-10-2017, 07:27 AM | #118 |
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10-10-2017, 07:38 AM | #119 | |
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Instead of acoustic knock sensors to adjust timing, the ignition coils have build in ion sensing circuits to sense pre-ignition. They won't pick up anything unrelated to detonation. |
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10-10-2017, 07:41 AM | #120 |
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Yes with your $3900 warranty.
I was just pointing out that the part is actually not that expensive and many jobs are fairly easy to DIY, it's the labor that kills you. Basically I'm just saying that contrary to what some are saying that they would never own a bmw without warranty. I'm just saying if you are handy for small things and use knowledgeable independent shops, they actually aren't that bad. My car has been out of warranty for over 5 years, I've driven it over 50k miles and haven't spent close to $3900 and that include me doing rob bearings, both TAs and other small misc stuff.
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10-10-2017, 08:04 AM | #121 | |
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10-10-2017, 08:48 AM | #122 | ||
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Whereas a knock sensor is more like a microphone, detecting actual knock and pulling timing when it does. My suspicion would be that by the time the rod bearings are knocking enough for a knock sensor to pick it up, it's already too late-- so both systems won't work. But, I am intrigued to see the results! But, yeah, non starter on the s65/s85.
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10-10-2017, 04:07 PM | #123 |
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Well, of course the idea of using scan data won't work with this " advanced' system we have in our M's. Maybe BMW should have been so advanced when they designed the rod bearings.
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10-10-2017, 04:15 PM | #124 | |
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I don't consider driving 50K in 5 years any serious mileage. I will put on 30,000 in a year. Its no wonder not much has gone wrong with your car. |
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06-05-2018, 01:18 PM | #125 | |
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12-04-2018, 06:24 PM | #126 | |
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Sent my oil for analysis and just got the alarming result. Wonder if u went ahead with the change afteral? Or did u wait for awhile before changing? |
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12-04-2018, 06:30 PM | #127 | ||
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12-04-2018, 09:59 PM | #128 | |||
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12-05-2018, 12:29 PM | #129 | |
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12-05-2018, 04:59 PM | #130 | ||||||||
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But Auto talents seems to be holding on to my order since last week. |
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12-07-2018, 11:07 AM | #131 |
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My warranty story is the following: I bought my M3 without knowing much about the specific issues with the engine. But, I have been playing with German cars for long enough of a time that it would give me piece of mind to have some type of coverage at least early on to cover me if my car turned out to be a Friday car. So I ended up with a 2 year warranty on the car. My thought was that if the car required a bunch of warranty claims in that time period, I'd just get rid of the car once the warranty up. And 2 years should be enough time to determine if the car is generally solid.
So here's how it all went down. I had $0 warranty claims. Almost everything I've done to the car at this point is maintenance, aesthetics, or performance upgrade-related. Do I regret spending the money on a warranty? Hell no. With my luck, I would have had a miserable ownership experience if I rolled the dice without any type of coverage. Like others, my opinion on aftermarket warranties are that they were there for piece of mind, just like insurance. I think there is definitely value in them, if you pick the right one, particularly if you are buying a car that can be very expensive to fix and you aren't sure about its history. |
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12-07-2018, 05:46 PM | #132 | |
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