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Cold start c7 issues

A

aw113sgte

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It got down to about 30f today (yay snow?) and since I got the tail lights reconnected I took the truck for a drive (first real test with Eco hubs too).
The truck didn't turn on the grid heater before startup (for the past month it has-40-50 deg). I tried starting and it cranked up better than before, also exhaust smelled a little different so I'm assuming it used the ether system?
I looked in cat et for data about outputs and temps but couldn't find anything right away (I'm not well versed in the cat software yet). It did have a flag for "cold mode" but I couldn't find what cold mode was.
Basically I'm trying to get some idea on when/what it trigged for cold mode.
I'm in WI and it's getting to -30 here at times. I do have a block heater to install as well. Not sure how many starts the ether cylinder will last?
 
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GeneralDisorder

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Can confirm that cold mode status flag is always set on any start below 158F. The engine rolls coal a bit in this mode.

I've never had my Ether engage that I'm aware of but I can't recall at the moment if I had the cylinder installed last winter or not. My truck came from Texas with no cylinder installed and as far as I can tell had never had one during it's service life.
 
hike

hike

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On the A1 the ether cylinder is back near the LBCD. I thought the A1R's used a heated fuel bowl instead?
 
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GeneralDisorder

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hike said:
On the A1 the ether cylinder is back near the LBCD. I thought the A1R's used a heated fuel bowl instead?
Click to expand...
No the A1R and A1P2 still use Ether assist and the solenoid/cylinder is in the same location. I just installed a bottle on the existing solenoid. The difference is that the later C7 uses a single Ether nozzle at the intake manifold and the solenoid is a different part number.
 
hike

hike

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GeneralDisorder said:
No the A1R and A1P2 still use Ether assist and the solenoid/cylinder is in the same location. I just installed a bottle on the existing solenoid. The difference is that the later C7 uses a single Ether nozzle at the intake manifold and the solenoid is a different part number.
Click to expand...
The heated fuel bowl: more misinformation shared by folks at MME—

[EDIT: I shouldn't pick on MME. I love my truck and they helped me have the confidence to start this journey]
 
Last edited:
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GeneralDisorder

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hike said:
The heated fuel bowl: more misinformation shared by folks at MME—
Click to expand...
There is a heated fuel bowl on the fuel/water separator element...... someone, somewhere is probably confused thinking that is involved in the cold start. I can tell you without a doubt it is not used by the CAT ECM (at least not directly). I just replaced my entire engine harness from the ECM to all the engine sensors including the grid heater relay, etc and the wiring for the separator heating element is not connected to any of it and didn't get replaced.
 
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Ronmar

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hike said:
These trucks are confusing—
Click to expand...
All the versions have them in the primary fuel filter/separator bowl. like the heater in the bottom of the air dryers, they come on with ignition power, but they are internally thermally regulated and do not actually provide any heat until they get cold enough. I think I read a spec on the old style air dryer of 28F. Their purpose is to keep the bottoms warm enough to keep any accumulated water in a liquid state so it can be drained off, or purged when the dryer vents…

In the case of the fuel bowl, and the volume of fuel the cat fuel system pumps, that tiny 24V heater would only barely have an effect on the water or fuel at the very bottom of the bowl below the separator plate. Someone saying it has something to do with fuel heating is, well, misinformed… With the fuel volume pumped by the lift pump, that heater would be like a candle in a blizzard... Disconnect the fuel return line at the tank and run it into a bucket and you will see what I am talking about…
 
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aw113sgte

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Did some testing with the Eco hubs today, truck wouldn't get above 170 even pulling a big hill for a few minutes (and then cooled down on the decent). Temp was 45 outside. Hill was steep enough 330hp rating and no load couldn't maintain 55. Time to order some thermostats. Also need to install that radiator shroud soon.
 
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