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My 1999 ram 2500 has a hard start, no start condition I have to unplug the pcm and ground wires to battery with the key on to get it to start and sometimes it goes to wto at start u. Any help would be appreciated 

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Does the starter motor crank the engine but the engine does not start?  

Which wires from the PCM are you grounding?  Color and connector position at the PCM please.

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It cranks but won't start. I'm unplugging the three buss bus connections from the pcm and then unplugging the grounds at the batteries on the passenger side. I do all of this with the key on and it will usually start 

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13 hours ago, Ede said:

I'm unplugging the three buss bus connections from the pcm and then unplugging the grounds at the batteries on the passenger side

Does it stay running after you reconnect these items or at what point does it die.

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23 hours ago, Ede said:

 I don't usually have problems with it for a few days

So, it's an intermittent problem.  Next time it happens try starting it with just the right connector at the PCM disconnected.  If it still doesn't start disconnect the left connector. The PCM grounds at the passenger side battery.  The center connector is for the transmission sensor and solenoid control.   Be sure all the connections, battery terminals, and grounds are clean and tight.

 

 

 

 

 

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17 minutes ago, Ede said:

I have also heard about ac noise causing ecm problems and I was wondering if that might be my problem. 

That's a good point and it should be addressed and corrected as soon as you can because it can led to other problems but I don't think it is causing this no start situation. 

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I have a similar problem, I already changed the crankshaft sensor, apps, overflow valve and I still have the problem that when I start it it is purring for a few seconds and it goes off alone, I already did the thing to disconnect the left connector of the pcm and it started me fine but I haven't gotten to the problem

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7 minutes ago, Ede said:

So after a bunch of research I have found it to be a bad ecm caused by ac noise 

 

Well, I'll be... for sure thought it was in the PCM.  So you'll be doing the W-T mod and sending the ECM out for repair?   

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