a must for 5.4s
Lead Driver
Joined: Nov 2008
Posts: 8,450
Likes: 70
From: South Jersey
my 04 had a funny idle problem even before i got my X3 this summer, i read rexhounds post the other day and brought my truck to the dealer to have them do a vacuum check on the motor since i allready installed new OEM IAC valve, fuel pressure regulator, and throttle position sensor and still had the problem. emailed mike this afternoon told him whats up and asked to have my three tunes adjusted to 750RPM and holy crap!! what a difference it made. no more idle problems, it fires right up stays up at a grand and slowly goes to 750 where it stops and stays at untill i put it and gear and go. before it would drop to 600 or lower jump back up and then idle back down to almost 580 620rpm. its awesome how one simple change can make me love my truck all over again! Rexhound awesome post and every truck should get this done asap!
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