Another long crank thread
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Cargo Master
Joined: May 2018
Posts: 2,442
Likes: 993
I caught it was an Excursion, but only because I took the link to YouTube direct where I could see it full screen on a 17 inch laptop.
the one thing I kept looking for, and never did see, was a Battery Voltmeter so "we" could see when the Glow Plugs cycled off.
I think that is very important, and for me, it is the single determining factor as to when I hit the starter....
I wait for the battery voltage to start to recover by about 2/10s of a volt or more.
In this video made about 4 months ago, I show the DVM and waiting until it starts to recover... roughly 40 seconds into the video the DVM is going down to the lowest point, then it recovers and the engine starts
Not mentioned in this thread, what weight oil is in the engine? I have found that going to 5w40 full synthetic makes a huge difference in now fast it cranks and starts up, and the idle smooths out fast.
https://www.youtube.com/watch?v=xd8ZaXL3Gxw
the one thing I kept looking for, and never did see, was a Battery Voltmeter so "we" could see when the Glow Plugs cycled off.
I think that is very important, and for me, it is the single determining factor as to when I hit the starter....
I wait for the battery voltage to start to recover by about 2/10s of a volt or more.
In this video made about 4 months ago, I show the DVM and waiting until it starts to recover... roughly 40 seconds into the video the DVM is going down to the lowest point, then it recovers and the engine starts
Not mentioned in this thread, what weight oil is in the engine? I have found that going to 5w40 full synthetic makes a huge difference in now fast it cranks and starts up, and the idle smooths out fast.
https://www.youtube.com/watch?v=xd8ZaXL3Gxw
I’ll get some fresh diesel in it and put a volt meter on it. I’ve got a spare GPCM to swap in if I need to.
IMO I don’t think it is the injectors, I could be wrong but the truck runs pretty good, doesn’t smoke and has good power. Throttle pedal response is a little slow but it has been like that for 10 years.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
At those temps after setting overnight I would expect a little more of a drop in voltage but it's hard to say without knowing how many amps the plugs are pulling. If the batteries are brand new and fully charged the 11.5 could be about right. I'd guess at least half of them are lighting up though. Now if the batteries have got some age on them and there's some kind of parasitic draw pulling on them all night, which is getting more and more common as the years pass, then the 11.5 would be high and I'd say the plugs aren't doing much.
Lead Driver
Joined: Jul 2017
Posts: 6,862
Likes: 2,335
From: WV
Originally Posted by brokestroke
Running 15w40 in it, won’t run anything different. I use 15w40 for everything so it simplifies the oil selection I keep on hand.
My previous OBS had over 300k. The 5w-40 made a HUGE difference in cold weather startups, even in the garage. The conventional would heavy lope for a while after starting, but the thinner synthetic cleared it right up.
I do think it would be worth your while for a test over the winter months (call it science). The hassle of a different oil for this one vehicle would be cheaper and easier than other repairs IMHO. Obviously the decision is yours though.
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Cargo Master
Joined: May 2018
Posts: 2,442
Likes: 993
Filled it up with diesel and a heavy dose of Diesel 911. Drove it around, warmed it up real good, and ran it kind of hard. Starts a lot faster now, still a little rompy when it’s cold (15-20 degrees) but I can live with it. It needs an oil change, might switch to 5w but we’ll see.
Lead Driver
Joined: Aug 2022
Posts: 5,092
Likes: 1,422
From: Oologah, OK
Filled it up with diesel and a heavy dose of Diesel 911. Drove it around, warmed it up real good, and ran it kind of hard. Starts a lot faster now, still a little rompy when it’s cold (15-20 degrees) but I can live with it. It needs an oil change, might switch to 5w but we’ll see.
it has the highest rating by the "OIL GEEK" for all around performance.
Banned
Joined: Dec 2018
Posts: 3,541
Likes: 458
Is the low-pressure pump original?
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Cargo Master
Joined: May 2018
Posts: 2,442
Likes: 993
Rebuilt the IPR and it helped. Developed a bad fuel leak now and am wondering if that is contributing to the loping it has on start up.
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