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  #1  
Old 01-02-2013, 12:29 PM
TexasRam84 TexasRam84 is offline
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Default Problems with keeping the truck running

I recently replaced the PCm on my 94 Ram 2500 with the 360 V8, after i replaced the computer i was having ignition problems, replaced everything in the ignition system, truck would run for a while and then would start to bog down and stumble as if not getting enough fuel or air mixture was off, also had a bit of a rough idle, so i replaced the idle/air sensor and it smoothed out quit a bit, but still after the truck runs for about 20 minutes, it starts to bod down and stumble again and then it dies, it fires right back up but starts to do the samething again, wondering if i need to replace the MAP sensor now, does anybody have any ideas, when the truck does run it runs great, you get on the throttle and the son of a gun gets it, really need to get this fix, so any ideas would be greatly appriciated
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Old 01-02-2013, 12:38 PM
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ramvan2500 ramvan2500 is offline
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Originally Posted by TexasRam84 View Post
I recently replaced the PCm on my 94 Ram 2500 with the 360 V8, after i replaced the computer i was having ignition problems, replaced everything in the ignition system, truck would run for a while and then would start to bog down and stumble as if not getting enough fuel or air mixture was off, also had a bit of a rough idle, so i replaced the idle/air sensor and it smoothed out quit a bit, but still after the truck runs for about 20 minutes, it starts to bod down and stumble again and then it dies, it fires right back up but starts to do the samething again, wondering if i need to replace the MAP sensor now, does anybody have any ideas, when the truck does run it runs great, you get on the throttle and the son of a gun gets it, really need to get this fix, so any ideas would be greatly appriciated
Well what I am about to say, I say all the time to the issue that you describe. There are people who are going to agree with me and disagree.
I would check the fuel pressure, especially based on the age of the vehicle. Now it can be anything yes I admit, but a good place to start is always with the fuel pump! The fuel pressure at the fuel rails should be in the realm of 43 psi. These engines are very picky about there fuel pressure, if it is too low the engine will run but might cut out at a certain speed or after a certain amount of driving. They really have a mind of there own. So before you go jumping into ignition issues, timing issues, vacuum leaks, and so on, first just hook up a fuel pressure gauge to the fuel rail check the pressure, check that off the list, then move onto a ignition and spark test, maybe sure the engine is able to get proper spark, check the ground cables, so on, check all that off the list, next check the vacuum...

If it turns out to be the pump I recommend highflowfuel.com
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Old 01-02-2013, 01:35 PM
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I can agree with checking the fuel pressure AND volume as well. You really need to scan the PCM for codes and if there are none, then move on to non-dtc based diagnostics.
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Old 01-02-2013, 01:43 PM
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ramvan2500 ramvan2500 is offline
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Originally Posted by RamTech View Post
I can agree with checking the fuel pressure AND volume as well. You really need to scan the PCM for codes and if there are none, then move on to non-dtc based diagnostics.
Yea forgot to mention about a code scan. See I always go directly to old fashion methods of diagnostics only because I lack many of the newer tools due to the cost, but, I learned it is better to just check vacuum, fuel pressure, oil pressure, and so on just to be sure. Treat a vehicle like a patient at doctors, check bp, respiration, so on...
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