The Mini Cooper is a playful and versatile vehicle that gives the user a highly-customized driving experience. Has anyone ever encountered this problem and can shed light on it? I really would not want to spend a couple hundred bucks on a new throttle body if it's not the problem.The Negative Consequences of a Faulty Spark Plug in Your Mini I just find it weird since it doesn't do it under the "chirping" throttle range, between 30% to 50% throttle, or over 70% throttle. The spring that works the valve, or maybe the valve itself, is loosening up or losing it's spring and is allowing the valve to flutter a little bit. What I'm thinking is that the throttle body is possibly wearing out. And like everything else, that made no difference at all. Had all my pulleys checked when my crank pulley failed this year, and nothing was recommended to be replaced along with that. I had the supercharger oil changed out during MOTD and the old oil didn't have any metal shavings in it at all. It is a noticeable power flux though, and you can definitely feel it, even in 4th. I don't have an actual boost gauge to more accurately record the problem. Although that is tough to read since the ScanGauge refreshes at once per second, it could be more or less than that. I am not getting any engine codes, and the ScanGauge does not show any flux in the TPS, but does show between 1-3psi on the boost during this flux at 50%-70% throttle. I have replaced the intercooler bellows, vacuum lines, bypass valve, etc., but can't seem to isolate the problem. I have checked for vacuum leaks but I cannot find anything. I have minor modifications to the motor itself (plugs, wires, coil pack, intake, exhaust, 15% pulley). The tach does not show any flux either (both the factory and the one on the ScanGauge). I don't have a D-1 spec controller or Sprint Booster either and the TPS on my ScanGauge does not register any flux in the TPS when this is happening. At 100% throttle (which reads as "88" on my ScanGauge - whole different debate there lol), you have no problems at all. It feels like a valve is fluttering slightly. You can hear the boost dropping out momentarily and coming back and repeats until you give it more or less throttle. No matter what gear I'm in, or how fast I'm going, or what RPM I'm at, time of day, engine temp, or air temp, it's always the same. Not only does the "chirping" sound happen at around 30% throttle, but between 50%-70% throttle, it makes a much louder "flutter" that you can actually feel in power fluctuation, along with actually seeing a flux in the boost (on my ScanGauge). I never noticed anything mechanically wrong or felt a power loss or anything, so I figured it wasn't anything worth investigating further.Īfter this year's MOTD, the problem got worse. So I said whatever, much like the weird vibration sounds from the interior panels you get while going through the twisties. I replaced the vacuum lines and hoses, but nothing fixed it. I thought maybe the bypass valve was wearing out and was "fluttering" a bit under low boost. The sound is most likely a small "flutter" in boost.Īfter last year's MOTD (2012), it never went away, and progressively got more noticeable. Each year after MOTD, it would eventually go away and stop making the noise. It's kinda hard to explain, but while the throttle is about 27%-30%, you can hear what sounds like a bird quickly chirping (normally on NC-28 going through the hills in 4th gear would recreate the sound). Normally, I don't beat on my MINI too much, or at least not like I do at MOTD lol. Over the past few years while at MOTD and for a few weeks after that, I have noticed something strange with my MINI. I have an '05 R53 with just over 155k miles on her.
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