Engine/Transmission (1998.5 - 2002) smarty and cold weather program

[jerrethomas]

I've had my smarty for about 6 months now and has gotten a little cold now. I have the smarty on sw 8 pertty much all the time. It was about 26 out last night and it's been down below 32 degress a couple of times and I can never get the high idle to work. I started it up this morning and let it idle for about 5 min and didn't get nothing. What gives? I know it's not cold enough for the 3 cylinder cut out but it should be for the high idle I would think.

 

[RSimmons]

To get mine to high idle, you have to release the parking brake. If either brake pedal is touched, the high idle shuts off. Also, the computer looks at the intake manifold temp. It must be fairly cold out as the grid heaters warm the intake for a couple of minutes after startup. You should see it happen in the mid 20s.

 

[JCyrbok]

my 01 has to be around 20-25 degrees for about 12 hours for it to kick in.





J-

 

[Sea01Cummer]

I demoed the smarty once and when it is downloaded it turns that feature on and leaves it. Last week when i was up hunting and the temp was 5 deg, the high idle worked but i never did hear the 3 cyl cutout. How cod does it have to be for that??



Steve

 

[jeepit]

I demoed the smarty once and when it is downloaded it turns that feature on and leaves it. Last week when i was up hunting and the temp was 5 deg, the high idle worked but i never did hear the 3 cyl cutout. How cod does it have to be for that??



Steve

I thought it had to be 0 deg for it to kick in?? and motor sitting at least 12 hours... or overnight.

 

[MeritBadge]

I too demoed the smarty from a friend of mine. Boy was that a surprise yesterday morning when the r’s started climbing. High idle kicks in at 32 degrees, three cylinder at 0 degrees. I can’t verify if there is a minimum time the truck has to have not run.



Your problem might also be a bad IAT sensor. There was a 5. 9 in the shop back at school, everytime we hooked up the software it read 140 degrees of intake air temp before start up. (Shop was always 70-80 inside and the engine only ran 2 times a week.



If needed this is a good site for sensors. http://www.hoeslidiesel.com/specials.htm

 

[onestackdram]

ok so why has mine never kicked in. we have seen a few weeks here that it was well below 30* in the morning and the truck had been off for more than 12 hrs. But i do plug the engine in everynight does that have something to do with it?

 

[cyborg]

How do you engage the smarty high idle?

 

[isb360]

The Smarty will automatically include the high idle feature in any programming mode, even when you return it to "stock". How do you make it engage? Simple: wait for the right conditions to be met which is a combo of throttle position and temperatures.



If you plug your truck in, the heating coil that warms the block actually is in one of the water jackets and warms the coolant. With the coolant warm, it will violate the "min coolant temp" criterion for engaging the high idle.



It was 18F here first time last weekend and I started the rig to warm it up and lo-and-behold the idle started climbing on its own! Which is the first time since 5/98 when I bought the truck that the feature worked. Dealer did the "high idle TSB" reflash on my ECM twice, but it never "took". Enter Marco stage left and all is solved.



Now I am just waiting for it to be cold enough to try the 3-idle clatter.



If you search "high Idle TSB" you will pull up lots of threads, more than one of which will probably list the specific criteria that must be met for idle to go up on its own.



Tim

 

[obert]

I think thy 3-cyl idle activates at 15* at the IAT, in the real world I see it happen in the single digits. As above, the plain high idle I think hits at 35*, but with the heaters runnin' its more like 25* ambient. The Engine temp must be below 140 for these to start, and if you let it run long enough, it will return to normal idle at ~160*. There's no "off time" requrement, but the iron does have to be good and cold and that can take several hours depending on the amient temp.



The first time Mine hit 3-cyl I 'bout crapped myself. Quite the unexpected noise I have found, if the engine is rather cold, unpluging the IAT forces High 3-cyl idle. Something to try on a chilly day at first startup. It will set a code and light the check engine icon.