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PLEASE HELP! 2002 f250 7.3 won't start cold

 
  #1  
Old 12-28-2015, 03:52 AM
dillon7.3
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PLEASE HELP! 2002 f250 7.3 won't start cold

I have an issue with my 7.3.... the truck will not start if it sits overnight without being plugged in, even in 65 degree weather. It starts and runs with a rough idle for about 10 seconds after its been plugged in for an hour, after the rough idle is gone it runs great .. it will Stat back up as long as the truck is warm (70+).... I've replaced the batteries, glow plugs, starter (it was going bad) and fuel filter. .. also replaced the gpr today. .... please help me out with ideas
 
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Old 12-28-2015, 03:57 AM
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Ideas:

1. Try 5W-40 full synthetic oil in the crankcase

2. Try anti gelling additive in the fuel tank
 
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Old 12-28-2015, 03:59 AM
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Thanks for the reply, it's 45 degrees here, I didn't think the waxes started to harden until 32 or below, it is definitely due for an oil change, I have about 7000 on this go.... I normally run Rotella t series 15-40
 
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Old 12-28-2015, 05:01 AM
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I had a bad problem with cold hard starts and I replaced everything as well glow plugs, gpr, fuel filter, everything I could think of and I felt with hard starts, leaving the truck plugged in. Till this year I switched to 5 w 40 full synthetic and boy was it a world of difference on cold starts. It starts right up and don't have romps any more wish I would have done it sooner
 
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Old 12-28-2015, 05:25 AM
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I'll give it a try and let you know thank you
 
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Old 12-28-2015, 08:12 AM
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All good info. 5W40 will be your best friend. Rotella T6 is preferred by some on here, while others prefer Mobile 1 Turbo Diesel or Valvoline Premium Blue.

Check out:

Used Oil Analysis - Bob is the Oil Guy - Bob is the Oil Guy

for more info.
 
  #7  
Old 12-28-2015, 02:59 PM
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When you do the oil change add ARCHOIL 9100 ...full 16oz to the oil. I think I had a very bad case of stiction in the injectors so I ran some 10w30 Rotella with the Archoil for about 1000 miles then flushed it and the HPOP then changed to Rotella T6 5w/40 with another bottle of Archoil. It has completely changed my truck cold starts and how it idles/runs.
The truck started Saturday at 12* without being plugged in which was huge. I'm pretty sure I need injectors but this is helping.
The ar6200 included in the link will help the fuel side of the injectors. I also used their 6400D (cleaner) with the 6200... Can definitely tell there's a difference!!

Archoil AR9100 16oz and AR6200 8oz Kit! Perfromance Bundle! Powerstroke! Friction Modi... https://www.amazon.com/dp/B00WAK0QXE..._UbAGwbFG680S2

Hope this helps!
 
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Old 12-28-2015, 04:13 PM
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Originally Posted by Colorado350 View Post
When you do the oil change add ARCHOIL 9100 ...full 16oz to the oil. I think I had a very bad case of stiction in the injectors so I ran some 10w30 Rotella with the Archoil for about 1000 miles then flushed it and the HPOP then changed to Rotella T6 5w/40 with another bottle of Archoil. It has completely changed my truck cold starts and how it idles/runs.
The truck started Saturday at 12* without being plugged in which was huge. I'm pretty sure I need injectors but this is helping.
The ar6200 included in the link will help the fuel side of the injectors. I also used their 6400D (cleaner) with the 6200... Can definitely tell there's a difference!!

Archoil AR9100 16oz and AR6200 8oz Kit! Perfromance Bundle! Powerstroke! Friction Modi... https://www.amazon.com/dp/B00WAK0QXE..._UbAGwbFG680S2

Hope this helps!
I ran it the full oil change.....cant wait for it to get cold to check....
 
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Old 12-28-2015, 06:12 PM
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How long are you letting the glow plugs "do their thing"? If you are only using the WTS light, that isn't enough when it is cold out. Try letting them cycle for 45 seconds or so before engaging the starter.
 
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Old 06-09-2016, 09:07 AM
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Originally Posted by dillon7.3 View Post
Thanks for the reply, it's 45 degrees here, I didn't think the waxes started to harden until 32 or below, it is definitely due for an oil change, I have about 7000 on this go.... I normally run Rotella t series 15-40
It not good to switch to a synthetic oil your seal's are set for normal oil run 10 w30 if anything
Did you test for power at the intake heater and glow plugs it could be the solenoid has gone bad
 
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Old 06-09-2016, 10:34 PM
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Hi Dillion7.3 and welcome to FTE!

Here's a thread where I went through a complete "test" to show the difference in the oils.

https://www.ford-trucks.com/forums/1...l#post16192687

Oh- and unless you are running a bypass filter, don't go past 5k on the oil. Your truck will hate you for it, LOL.

Good luck, you should notice an immediate difference with synthetic 5w-40w
 
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Old 06-09-2016, 10:53 PM
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Originally Posted by Kenmc
It not good to switch to a synthetic oil your seal's are set for normal oil run 10 w30 if anything
I think this is not the case anymore with modern oils, if it ever were true to begin with. Plenty of people switch between synthetic and Dino all the time with no issues at.
 
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Old 06-10-2016, 05:37 AM
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Someone dug up a thread from December....
 
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Old 06-10-2016, 06:53 AM
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Originally Posted by HKusp View Post
Someone dug up a thread from December....
I fell for it...
 
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Old 06-10-2016, 07:11 AM
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Originally Posted by Rikster-7700 View Post
I think this is not the case anymore with modern oils, if it ever were true to begin with. Plenty of people switch between synthetic and Dino all the time with no issues at.
Ya I know I have seen a lot of people do this over the year's and lots of leakie rear main seal's
I tried it my self along time ago and I lots of leaks when I change back they all went away
 

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