1st Gen R53 Cooper S Most liked posts in thread: Thought problem fixed but still having codes

I'd check both boots again well, all the way around, clear codes again, start it up, make sure no codes, then run and see...

Map sensors hardly ever fail.. Though it can happen

 

I'd take the boots off completely and give them a good look over. I had a similar issue, and one of the intercooler boots was actually torn--I couldn't see the tear, because it was underneath.

I replaced both boots, no problems since (GP intercooler).

Damn Blimey just snuck in there before me...lol.

 

Check the IC for leaks too, they do fail. Ask me how I know.

Dollars to doughnuts you still have a leak somewhere.

 

Just a shot in the dark, but could the problem could be related to the bypass valve? Seems like the bypass valve should open upon deceleration, allowing the pressure to drop, and if for some reason it doesn't open, the pressure could be too high and throw a code. I'm just throwing it out there to see what you guys think. That could be a reason why the IC boots are coming off as well. Do you happen to have boost gauge? That could tell you if you're overboosting. With a 15% reduction pulley, you should be around the 15-16lbs range at max throttle and rpm. Just throwing it out there, and trying to think outside the box. It could just be a sensor, but if it's saying the pressure is too high and the IC boot is coming off, that makes me wonder if the BPV isn't functioning properly. If you have a way to check the boost levels during acceleration and deceleration, you should be able to figure out if it's a boost related problem, or a sensor problem. The ScanGauge II has a boost setting and can tell you what the S/C is making, but I believe that works off the map sensor. So if you have an actual boost gauge, and can also use a ScanGauge II, you should be able to determine exactly what is going on, whether it's boost related or sensor related. Anyone else care to chime in? Like I stated, this is a shot in the dark, and I could be wrong.

 

any more info on this problem?