'03 won't fire when colder than 20 degrees outside - Hemi Truck Club
 
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Old 01-16-2015, 10:11 AM   #1
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'03 won't fire when colder than 20 degrees outside

I'm original owner of 03 2500 2wd, 220,000 miles. Does not burn any oil. It runs great all the time, except when it gets below 20 degrees F outside. It will spin over fine, just not fire. Above 20 degrees, starts fine, below 20 degrees, just spins.

I keep up with new plugs, just installed a new set one month ago. Taylor shorty wires and K & N cold air kit, both installed a long time ago.

The thing is, I have never replaced the coils or injectors.

Does anyone think that the coil packs get weak, with age or with cold?

I hope to get one more year out of this truck. I was thinking about installing new coil packs. I can get the MSD 82568 from amazon for less than what no-name stock coils cost locally.

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Old 01-16-2015, 11:39 AM   #2
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spicoli


Some of our engine specialists should be along soon to help answer your question.



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Old 01-16-2015, 11:50 AM   #3
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I would suspect the battery
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Old 01-16-2015, 12:31 PM   #4
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Old 01-16-2015, 01:36 PM   #5
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I thought about the battery, but it spins over fine. It is a (4) year old DieHard Silver, or whatever the Diehard premium battery is.

Are you thinking that, while the battery has enough to crank the engine over, it's not holding enough voltage to light the ignition when it's cold?

That is very interesting. Thank you.
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Old 01-16-2015, 05:19 PM   #6
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My guess is the Taylor short wires. They are known to have problems when cold. I have no experience personally with them, but I've read a couple times over the years where they can be slow to start.




Edit: http://www.hemitruckclub.com/forums/...-cold-668.html
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Old 01-16-2015, 11:21 PM   #7
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When I had the shorties it would misfire when cold, you are getting no spark at all? Also I would think you would have seen this before, living in Chicago.

If you need coils, I think these might be cheaper than MSD.

Good luck!
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Old 01-17-2015, 03:31 AM   #8
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Take the shorty's off and see how it starts. I had the same thing. I put new coils and plugs on and did a temp sender/censer. The next cold snap it did the same thing.Cranks but wont start pops back through the intake. I froze my back side off last yr. doing the work but it started fine. So far this year all good but its been pretty calm so far lowest it has been is 5 deg for a few days and it started fine.


I also put the shorty's back on for the summer just for the look at the car/truck shows. Then did a swap back in late fall
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Old 01-17-2015, 09:01 AM   #9
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Thank you for all the great advice!

(1) I found my DieHard Platinum is going on (7) years old. Time for a new battery, regardless of the spark issue.

(2) The first time I had this issue was last winter.

(3) I kept the stock plug wires and mounts wrapped up and in my house when I installed the CAI and the shorty plug wires. It's over 40 degrees outside today!! I'm going to put the original wires back on. It won't get cold until week after next, so it will be a while before I know what helped.

It seems from this discussion, and the link to the previous discussion, thanks!) that the shorty wires are good to use, as long as you have a coil upgrade.

I'll see how it starts with the original plug wires, they were not too old when I took them off. I only did the shorty wires with the CAI so it would be easier to access the plugs, with less of a mess under the hood.

If the truck starts when below 20F with the original wires, I'll get the MSD coils (around $325/amazon) and try that with the shorty's.

I live very close to work, and my wife gets home before I leave, so if the truck doesn't start, I use her Jeep. I'll troubleshoot this and let everyone know.

Thanks again!
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Old 01-17-2015, 09:09 AM   #10
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If you are considering buying new coils you might consider going to the 6.1 coils. It would require electrical coil plug adaptors for plug and play or splice in new 6.1 pig tails like I did years ago. Of course like every mod there is a discussion on how effective they are. I personally like them.
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