dieselnewbie

It's going down to 0 tonight and I want to see if it kicks in during the morning high idle warmup.

Thanks!

DT.

Gypsyman

3rd gens don't have the 3 cyl idle, just high idle of 1000 rpm.

Richard

phox_mulder

I thought they still did if it got cold enough.

If it's the same parameters as the 2nd gens,

1. Intake Manifold Temperature less than 0°C (32°F) and,
2. Coolant Temp is less than 60°C (140°F),
you get the high idle.

Additionally, if Intake Manifold Temperature (IMT) is less than -9°C (15°F), and all of the parameters above are met, three of the cylinders will be shut off upon reaching 1200 rpm,


Just might be cold enough there, if it's been enabled.


phox

roan65

I've had mine down to -50, and I've never had 3 cyl shutdown,

JohnnyH

I dont understand the purpose. It seems like it would warm up better if all 6 were firing.

dieselnewbie

Welp, just started the truck after 9 hours in the freezing cold (not like north of the border but cold).

It's now 0*F and no 3 cylinder idle.

The auto high-idle kicked on immediately but still no 3 cylinder idle.

Oh well.

bkrukow

I thought they where suposed to run on 3 cyl as well below a certain temp but it has not done it for me either. Its been well below 0* F a few times and just instantly goes to 1000rpm on all cylinders. Must not be on the 3rd gen trucks.

gsbrockman

To my knowledge, the rationale was that 3 "dead" cylinders made the 3 "working" cylinders work harder, therefore a shorter warm-up time. Our 3rd GEN trucks have no 3 cylinder mode, unless you're unlucky enough to have failing injectors.
Greg

Blygy

Had a DC mechy type guy tell me that the 3 cylinder warm was the greatest thing.. Told him to enable it on my truck as I wasn't aware it was available on the 03s and up. Guess what, it isn't we couldn't find it in the computer.

Blygy