Cold Start vs. Hot Start question
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
Likes: 65
From: 'Pitlock, Maine
Cold Start vs. Hot Start question
Cold Start my truck is running by the time it comes up on compression 3 or 4 times. When Hot it will take about twice as many times like 7 or 8 times before it fires. My question is this: will the consistency of the oil cause this? It seems to me that the thinner the oil due to the fact that it's hot would take that much longer or at least somewhat longer to build up the needed pressure to fire.......am I wrong in thinking this? or is this a sign of pending problems? It has been the same since I have owned the truck....about 7k miles, the truck now has 109k on it. Thanks in advance for any input.
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
Likes: 65
From: 'Pitlock, Maine
Batteries are new, I just replaced them with two new Maxx Ever Start group 65 850 CCA from Walmart, it made no difference it started the same with the old batteries. engine starts and runs fine just cranks a bit longer when hot. FICM volts are never drop below 47.5 and I have never seen them go higher than 48.5. 12 degrees above yesterday morning and the truck fired up and ran fine.
Mountain Pass
Joined: Nov 2005
Posts: 164
Likes: 2
From: Cloverdale VA
Mine is exactly the same. It's been less than 6k miles since the headgaskets were replaced at which time the standpipes were replaced and my dummy plugs and STC fitting were done just prior to me stretching the headbolts.
Its never an excessively long crank just different between hot and cold.
Time to start collecting the parts to do the nipple cups in the oil rails.
Mileage is at 142k.
Its never an excessively long crank just different between hot and cold.
Time to start collecting the parts to do the nipple cups in the oil rails.
Mileage is at 142k.
Thread Starter
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
Likes: 65
From: 'Pitlock, Maine
Mine is exactly the same. It's been less than 6k miles since the headgaskets were replaced at which time the standpipes were replaced and my dummy plugs and STC fitting were done just prior to me stretching the headbolts.
Its never an excessively long crank just different between hot and cold.
Time to start collecting the parts to do the nipple cups in the oil rails.
Mileage is at 142k.
Its never an excessively long crank just different between hot and cold.
Time to start collecting the parts to do the nipple cups in the oil rails.
Mileage is at 142k.
Exactly! instead of firing up in 1 second like when it's cold soaked it may take 2 when it's hot.
Lead Driver
Joined: Oct 2010
Posts: 5,420
Likes: 16
From: Ouray, CO
When cold (aka overnight), I tend to wait about 10-seconds after key-on to crank and it typically fires up instantly.
When hot, I wait about 2-seconds after key-on and it typically fires up instantly.
When warm, it's usually a 2 second crank - I haven't found the sweet spot for waiting yet - and I don't really alway think about it either.
My fuel pressure gauge always goes up to 65-70 instantly too, so I don't think it's fuel availability related.
When hot, I wait about 2-seconds after key-on and it typically fires up instantly.
When warm, it's usually a 2 second crank - I haven't found the sweet spot for waiting yet - and I don't really alway think about it either.
My fuel pressure gauge always goes up to 65-70 instantly too, so I don't think it's fuel availability related.
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JeffJ30
1999 - 2003 7.3L Power Stroke Diesel
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Jun 18, 2013 09:13 AM
