Cold Start Issues - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 14 (permalink) Old 03-17-2014, 11:20 PM Thread Starter
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Cold Start Issues

I bought a 2005 F250 CC SB a few weeks ago and for some reason it wont start below 35-40. If it is plugged in for a couple hours it starts fine. Little white smoke at startup that goes away in a couple minutes or so and it runs great (no stumbling, shaking, knocking etc.) Today its around 25 degrees out(NW Pa) and i decided to check out the FICM voltages. To my surprise i got ~58v when cycling the glow plugs and ~58v when cranking. Couldn't get an idling voltage because it wouldn't start. The previous owner never mentioned that the 58V conversion was done. While i was under the hood with the multimeter i tested the battery voltages ~14v while sitting and it drops to ~12v when cranking.

Could it be the previous owner (from west Virginia) put a heavier weight oil in due to the warmer climate? My thought is the thicker oil(when cold) doesn't actuate the injectors properly which keeps it from starting. Am i just expecting too much from a diesel in cold weather?

I am new to diesels, and all i know has been from lurking on this forum.

If you have any suggestions or things that i should check please share.




Thanks

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post #2 of 14 (permalink) Old 03-18-2014, 02:26 AM
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Re: Cold Start Issues

Sounds like a case of stiction. Try a 5W40 oil next oil change. Should help if you are currently running a 15W. Alot of people swear by RevX. Might consider pouring a couple bottle in on your next oil change as well.

If nothing else, just plug it up the night before. Doesn't hurt anything to plug it up every night.

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post #3 of 14 (permalink) Old 03-18-2014, 02:30 AM Thread Starter
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Re: Cold Start Issues

thanks for the reply
i already bought a bottle of AR9100 but i want to wait for the next oil change with the correct weight. Plugging it in is fine in the morning but getting home from work is another story. The insanely cold winter isnt helping either

long term, what is the fix for stiction? new injectors? i have heard many times that oil additives will only mask the problem

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post #4 of 14 (permalink) Old 03-18-2014, 02:32 AM
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Re: Cold Start Issues

Sounds like a glow plug issue to me

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post #5 of 14 (permalink) Old 03-18-2014, 04:42 AM
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Re: Cold Start Issues

I'm going to vote Glow Plug issues also. If your glow plugs are working your voltages should be lower than that.

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post #6 of 14 (permalink) Old 03-18-2014, 04:46 AM
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Re: Cold Start Issues

Check the glow plug harness it could be chaffing somewhere

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post #7 of 14 (permalink) Old 03-18-2014, 12:48 PM
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Re: Cold Start Issues

The first thing I would do is check the glow plugs and scan it. Sometimes the connector on the GPGM is burnt, it is on the right valve cover. But by far the most common problem for your hard start problem is stiction. Now this can be tuff to diagnose because no scanner can give you the data to diagnose it, the only way to diagnose stiction is with a Hickok G2 tester, I've used one and it works and will 100% diagnose a stiction problem.
So the fix, the only way to fix this stiction issue 100% is with a set of Motorcraft injectors, anything else is just a band-aid, I've tried them all and then tested the results with the Hickok G2, they can help but won't fix the Stiction isssue.
I've seen a truck like yours, won't start in 30-40*, replace the injectors with Motorcrafts and they will start in -15 without being plugged in. U-tube has video's on how that tester works.
I used to own a shop and have one of those testers, I've seen it used on 100's of trucks. So if you have it hooked up on a cold engine, (overnight cold soak) and started the engine, you would see some of the stiction start to disappear after the first minute of run time, some injectors would take longer, some would never clear up, that's why it's tuff to diagnose. You have less then a minute window to catch it 100%.
So if your glow plugs work correctly, your battery's and starter are good, then your problem on a 6.0 is stiction pure and simple.

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post #8 of 14 (permalink) Old 03-19-2014, 12:15 AM Thread Starter
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Re: Cold Start Issues

i am not ruling out stiction completely but i am still leaning towards glow plugs. Today it was warm (40 deg) so i pulled the terminals off the GPCM and they look great. put them back on and got in the truck. Let the plugs cycle (the pre crank injector clatter was smooth) cranked the truck for about 5-10 seconds and it wouldn't start. Repeated a second time. lots of white smoke coming from the tailpipe while cranking. Third time it sputtered to life with nice smooth idle. Checking the tail pipe i saw some faint white smoke for a few minutes of idling then it clears up. i would think that stiction would create a stumble or rough idle.

Is there a way to test the GPCM and plugs without a scanner? there should be a way to just test the resistance of each glow plug from the harness but i couldn't figure out which pin was connected the correct cylinder.

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post #9 of 14 (permalink) Old 03-19-2014, 12:55 AM
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Re: Cold Start Issues

Just unplug the glow plug harness and start checking resistance on the pins, if you have four that are same then I'd say its good.
A scanner is a must to diagnose these engines correctly.

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post #10 of 14 (permalink) Old 03-19-2014, 01:00 AM Thread Starter
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Re: Cold Start Issues

what would be your suggestion for a good scanner at a reasonable price?

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