Thanks to everyone for the posts about the MAP sensor problems. I got mine replaced today and it seems to have taken care of the high-rpm hesitation problems I was having. My S is breathing much better now.

 

was it under warranty?

 

What were the symptoms of your high-rev problem?

 

Yes, it was replaced under warranty. I'm at 38,000 miles but the service guy said that the MAP sensor falls under the emissions warranty, which is 3 years/50,000. Never heard that one before, but I didn't argue.

The high-rev hesitation has been well-documented by others on this board so I suggest you do a search to get a comprehensive recount. In a nutshell though, frequently when I'd VTEC, the progression of the revs would sputter, fall, catch, and then rise again over the course of about 2 secs. It was frustrating to say the least, and even enabled a 330i to walk away from me (this event repeats a lot in my head).

With the new MAP sensor though, the revs just build without fail all the way up to redline as they should. It's like owning a brand new car all over again.

 

H and A has the MAP sensor for $42.96, anyone know if it's difficult to remove and install? I'd guess by the end of this year there will a few S2K's out of factory warranty & could be an easy/cheap way to trouble shoot the symptoms you described.

 

Very easy to to replace the MAP sensor. All you need is a phillips head screwdriver. It is located at the end of the plastic hose coming from the airbox on top of the Throttle body. Held down by 2 screws. Unhook it from the harness (careful when doing so because the harness clip is easy to damage) and then unscrew it from the throttle body. Make sure that when you remove it, you don't lose the little O-ring that is underneath it. All in all 5 minute job.