OK - Maybe I misunderstood but - the owners manual wasn't real clear on the LLY Elevated Idle feature. The maual makes it sound like you have to "enable" the option everytime you want to use it once it is returned to normal idle due to one of the factors (150 engine temp / over 32* intake air temp / depressing the brake or accelerator). This is not the case as I have found since colder weather has set in.

Once you "enable" Elevated Idle (I don't have the DIC so I do it manually) it will automatically activate and raise the idle speed anytime you start the truck below the above mention factor threshholds.

As an example - backing it out of a warm garage into colder outside air. Once it's placed into park and left to idle the idle will elevate until the parameters are met.

Just a little FYI incase anyone else is confused as I was :rolleyes:

Rob

so what are the conditions that the elevated idle will turn on ? i had thought that you can just turn it on, and it will raise the idle if its cold enough ? i havent seen mine come on yet though, is there something else you have to do ? and how cold does it have to be in order to activate ?

It says it in the manual but, IIRC intake air temp has to be less than 32*F (I'm guessing the MAF sensor determines the temps because mines worked when the rearview mirror temp was 36*F). Can not be in gear and brake cannot be applied. Also Engine temp must be below 150* IIRC.

I was surprised as H*** this morning. It was 25 degrees out. Started the truck and backed out of the garage with my daughter and pulled down to the end of our long drive to wait for the school bus. Put it in Park to wait for the bus and the High Idle kicked on after about a minutes time.

It works really good. I am really impressed with it so far.

As a side note, according to my predator the load on the engine is around 11% when it is on high idle and around 6 or 7 when it is on regular idle. When you enable the PTO option to rev it up to 1250 rpm, the load is only 7% or so. So when you use the automatic high idle you are warming up faster then if you were to use the pto option. I suspect this is due to the VVT creating more back pressure to aid in warm up.

Max - does it matter if the parking brake is applied, its been getting down into the 30's when i go to work so im going to try this out. and all i need to do is go into the dic and tunr the elevated idle to "on" right, thanks again

Tbone - nope, the parking brake doesn't matter....Just has to be below 32 degrees....Any input to the throttle or brake turns it off though

The engine temperature also has to be low. It will not come on at 160 degress for example.

Hey max, is there anyway to incorporate the high idle mod into a remote starter so you can idle it up from outside the truck??

Only PTO not the high idle itself. PTO will increase RPM's but doesn't change any turbo settings.

Like I said before, I am very happy with the automatic high idle. I can't imagine where it wouldn't be sufficient.

Yeah I totally agree with you there, but I think the manual high idle must help some. How do you incorporate it into the wiring and stuff.

Since MI has been having cold temp.'s lately I have been using the automatic high idle quite frequently on my LLY. I've noted the following observations:

#1) Truck is kept in an unheated garage. In the AM when starting it before leaving for work (I have the block heater on for about 90 minutes) the high idle will ramp up when it's suppose to when the intake air is cold enough. Once my OEM temp. gauge shows about 170* or so the high idle will disengage automatically like it should.

#2) Upon leaving work for the day (no block heater) in very cold temp.'s (below 10*F) when the truck has been sitting all day, the high idle will ramp-up when it should. But, it does not automatically disengage when my OEM temp gauge shows 180*F+. It finally will disengage once up to near the 200*F mark.

Why the difference in when it automatically disengages. This difference is usually only noted during starts in VERY cold weather. In midly cold weather it disengages during any cold start at the 170*F mark or below (manual says 150*F).Could it be that the coolent temp sensor it is using is located somewhere in the coolent system other than where the OEM gauge sensor is or does the OEM gauge have that much of a variance.???

P.S. I'm not a nut and haven't been drinking ):h

I don't know why that is but I noticed the same thing, when it got really cold out, 10 or less, mine would stay on to more like 175 or so before it shut off... It also seemed like it was up a little from 150 when I started it (it had been running earlier in the day) and it still came on until it got to 175-180... Only when it was really cold out though.

_nar_,

Same with mine....only when really cold! It doesn't cause me any problems, just a little different and can't quite figure out why it does it.

mine will not high idle. and yes its turned on. its been 13,17,and 25 last 3 mornings and it will not high idle

mine will not high idle. and yes its turned on. its been 13,17,and 25 last 3 mornings and it will not high idle

Just checking to make sure you know that it takes a couple of minutes to start to ramp up.....foot off brake, in park??

Just checking to make sure you know that it takes a couple of minutes to start to ramp up.....foot off brake, in park??

Mine just takes about 10 seconds to start the high idle.

Mine seems to take longer to ramp-up the closer to 32*F it is outside but it always takes about a minute or so the first time, then pretty quick there-after.

Rob

Thanks for the explainations. I don't think that it has gotten cold enough down here yet, but I will be heading north and it is supposed to be -8. I am sure I will test it then.