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1994 3.9 won't run when warm

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  #11  
Old 04-11-2008 | 06:31 PM
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sprocket1200
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Default RE: 1994 3.9 won't run when warm

codes from FAQ, have helped me alot

https://dodgeforum.com/m_63384/tm.htm

mine seemed to have same symptoms. you never mentioned replacing the ingition coil. I did that and it works like a damn now! Don't forget the contact gel to prevent problems later.

Good luck!
 
  #12  
Old 04-12-2008 | 05:12 PM
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crusing52
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Default RE: 1994 3.9 won't run when warm

Well here is the update. I thought about the codes for about a day. When the truck wasn't running good I unplugged the TPS. Figured if it helps I could test it. Nothing happened. Next when I went to work on the EGR I accidentallyunplugged one of the vacuum lines. So today I went out tothe truck to inspect the distributor as intended before finding EGR problem. After removing it I found that the cap looked as if someone had penned it over. The distributor shaft has a lot of play up and down, about 3/32". So I removed the drift pin and replaced the washer that was in there with a slightly thicker washer. After I put it all back together. I reset the pcm. Started it and let it idle for 20 min. Took it for a ride a few times. I've shut it down about 20 times and restarted it. So I'm positive I need to replace the distributor now. Oh after all this I recheck the PCM for any problem codes and all I got was 12 & 55 I know 55 means it is complete but what exactly is 12. Does it just mean the pcm has been reset recently?

Thanks for all the replies.
 
  #13  
Old 04-13-2008 | 01:33 PM
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dkmill03
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Default RE: 1994 3.9 won't run when warm

sounds like the same problem im having with my 92 don't have a clue as what it is either. someone told me maybe the crank sensor, i just havent changed it yet still looking for ideas. mine did it every once in a while now all the time. if u figure it out let me know and if i do i'll let u.
 
  #14  
Old 04-15-2008 | 01:21 PM
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crusing52
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Default RE: 1994 3.9 won't run when warm

dkmill03I was think of changing the crank sensor next. I guess it works like a speed sensor also.l can get it to start up now but it just runs really poor. I have no codes still. The distributer made it run better but its still not perfect. I might try the crank sensor next. It runs now but it is still miss firing and once in awile it will backfire and puff out a cloud of black smoke. I'll keep you posted.
 
  #15  
Old 05-23-2008 | 01:46 AM
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sprocket1200
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Default RE: 1994 3.9 won't run when warm

you didn't specifically mention the ignition coil. mine was failing intermittently. 2 screws and 5 minutes later, it runs like a champ!

 
  #16  
Old 05-23-2008 | 04:47 PM
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Bad96_3.9
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From: Crawfordville, FL
Default RE: 1994 3.9 won't run when warm

have you changed the temp sensor? the air intake temp sensor will advance or retard timing if it is not running right. it would not hurt to change the coolant temp sensor too while you are at it, my escort would not run right when the coolant temp sensor went out.
 




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