For the past year, I have this aweful (to me) whine/vibration that occurs when my truck is cold, in gear, and completely stopped. It has been to the dealer numerous times, but still no fix. The only thing that I've found that makes the noise go away (or at least greatly subside) is to slightly raise the RPM (slightest touch on the gas pedal). So over the last few days, I've experimented with the idle RPM setting on the EDGE tuner. I've found that if I raise the idle RPM by 100 RPM, and the noise goes away. Just want to get feedback on whether or not this will cause any harm to my truck. I realize this is more of "masking" the problem than solving it, but it's the best solution I have right now.

 

I don't think it would cause any physical harm, but your gas mileage will drop, probably noticeably.

my 02

 

Wow, I didn't think about that... Do you really think it will drop noticeably by raising idle RPM by 100?? As it is, doesn't our RPM flucuate within about a 75 RPM range to compensate for various conditions (A/C, fuel mixture, etc)?

 

It will definitely drop, how much I have no idea, it just seems that it would be noticeable. No harm in trying it and doing a mileage check or two. Theoretically, I guess it could increase your temps, but with a newer truck it should be fine. Just thinkin out loud

 

I doubt it'll cause any harm, but if you get too carried away it'll probably cause a TPS correlation fault, since the TPS sensor is saying "Idle at (X) rpm" but the engine is actually running at (Y) rpm.

 

I doubt you will see ANY fuel mileage difference.......unless you sit in traffic idling for 80% of your driving, I don't see this affecting that at all. I know MT suggest raising the idle speed with the X2 to compensate for increased load on the alternator if you have E-fans. Go ahed and do it. I do it all the time on cars at work that have idle/hessitation issues. I bump the idle up about 100 RPM in correction programming of the engine control module.