2023 HO long crank time

[mpaulson]

I just received my ordered 2023 3500 HO/Aisin last week to replace my 2018 HO/Aisin and it has a very obvious long crank time every time I start it, like 4-5 seconds. Is this the new normal with the 2023’s? We have a pair of 2019’s (still with the CP4), and they don’t do this long crank thing.
Anyone else having this happen?

 

[Turbo Terry]

My 2022 ho seems to crank a bit longer than my 99 which was just hit the key it was running

 

[AH64ID]

Yes they seem to crank a bit longer, but that seems longer than normal. There is a TSB for the starter but, but I’m not sure if it carries over to the 23’s or not. Let me see if I can find a copy.

EDIT: 23’s don’t appear effected.

 

[Timd32]

"More Conductive" I guess it sounds like the stud and the cable lug don't make the best connection.

Reminds me of some of these internet posts.

 

[Ozymandias]

Oh boy... never seen something like this.

Is this a slow blow fuse?

 

[mpaulson]

It cranks at full power and speed, just doesn’t fire for a bit. When it fires it’s instant, not a “chugging” start.

 

[Turbo Terry]

Mines the same. But I will take a copy of the tsb to the dealer when someday I get called for a grid heater relay replacement and tailgate repair. It might be a while.

 

[sag2]

A 4-5 second crank will seem like forever. Perhaps actually time it, it might only be a couple seconds.

 

[mpaulson]

A 4-5 second crank will seem like forever. Perhaps actually time it, it might only be a couple seconds.

Yea, you’re right it’s about 3, but it does definitely feel like eternity compared to every other Ram Cummins I’ve owned or still own. Very noticeably longer.
Any good explanation for this? I’m guessing that these latest HO are running even higher fuel rail pressures and they won’t kick in the injectors till they have enough rail pressure while cranking. And that maybe the CP4’s they used in 19 & 20 built pressure faster and that’s why they attempted that route? And the CP3 doesn’t build as fast at the start?

 

[AH64ID]

Yea, you’re right it’s about 3, but it does definitely feel like eternity compared to every other Ram Cummins I’ve owned or still own. Very noticeably longer.
Any good explanation for this? I’m guessing that these latest HO are running even higher fuel rail pressures and they won’t kick in the injectors till they have enough rail pressure while cranking. And that maybe the CP4’s they used in 19 & 20 built pressure faster and that’s why they attempted that route? And the CP3 doesn’t build as fast at the start?

I think it’s just programming. Idle rail pressure isn’t appreciably different from my ‘18 to my ‘22, and the ‘22 takes a bit longer to crank. All 3 of my HPCR’s have had CP3, they build pressure plenty fast to fire instantly.

There could be plenty of reasons the ECM waits to fire, but I’m not sure we’ll find out.

Like everything else, it’s probably emissions based. Let the motor get up to speed before firing to reduce incomplete combustion at initial ignition.

 

[Turbo Terry]

Yes maybe to eliminate that poof of diesel smoke at start up. I’m not to concerned about it.

 

[Ozymandias]

What do other '23 owners report?

It can be programming - but it can be also mechanical from a bad starter, bad sensors that react to slow to bad CP3 that is to slow to build pressure, heck even a slow starting lift pump can come into play.

Personally I think 3+ seconds is excessive. 2 seconds is normal.

 

[Turbo Terry]

I have been driving my 2022 again more now. The start is a bit longer but not dragging so I think it’s normal

 

[Timd32]

I remote start almost every time, so not a clue how long it takes usually no where near the truck to notice. It's never not autostarted, doesn't make it right. But have never noticed a negative effect to date.

I dont let it idle too much 2m - 3m in advance usually works good when it's cooler out here, we don't get those artic Temps very often in NJ. Enough to get the shop lights turned off and away we go.

 

[Turbo Terry]

Yes I have certainly become conscious of my idle time also. Start it up and drive away pretty much now. The old 99 used to idle a lot more. I’m sure my neighbors are happy it’s gone. It was pretty loud

 

[Ozymandias]

Yes I have certainly become conscious of my idle time also. Start it up and drive away pretty much now. The old 99 used to idle a lot more. I’m sure my neighbors are happy it’s gone. It was pretty loud

99 was by my knowledge by far the most noisy engine ever that left the Dodge factory.

 

[Turbo Terry]

Yes it was. Young men would walk by and just smile. It did sound good like a good Harley or a 2 cylinder John Deere tractor. Beautiful noise.But at almost 73 the new quiet is nice. I’m learning to enjoy it.

 

[Turbo Terry]

And it would roll coal