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Dtc P1391. 2002 ram 1500

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  #11  
Old 01-18-2018, 08:24 AM
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Are they both mopar sensors now?
 
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  #12  
Old 01-18-2018, 10:40 PM
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Neither are, it’s developed a miss when it’s cold now, and hesitates
 
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  #13  
Old 01-19-2018, 08:24 PM
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You really want mopar sensors in there....... the aftermarket fellers just don't work as good.
 
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Old 01-22-2018, 06:21 AM
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After it runs about 6 or 7 minutes the miss disappears and runs great, so I don’t think it’s related to the sensors to be honest
 
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Old 01-22-2018, 08:28 AM
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Have you checked fuel pressure? Wonder if it is a bit low, and when the truck goes into closed loop, the O2 sensors compensate?
 
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  #16  
Old 01-22-2018, 03:23 PM
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Well it started messing up real bad today after sitting for a few hours, I didn’t let it warm up just jumped in and went and it was terrible, so I pulled over, used a code reader(p1391) same as before, cleared the codes and it ran fine so I would rule out fuel pressure
 
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  #17  
Old 01-23-2018, 07:31 PM
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I got some freeze frame data, the short term fuel was at 0 and long term fuel was at -3.1 when I get code, I accidentally erased the reader so now I have wait till it happens again
From what I’ve read, total of both should be around 10% Engine load was 0 and rpm around 796 speed was 0 My scanner only does freeze frame at time of the cel
 
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  #18  
Old 01-23-2018, 09:31 PM
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Hhhmmmm...... Are you still getting the 1391 code?
 
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Old 01-24-2018, 10:50 PM
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Originally Posted by HeyYou
Hhhmmmm...... Are you still getting the 1391 code?
Yes still getting same code
 
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  #20  
Old 01-25-2018, 09:27 PM
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Originally Posted by shanes76
Yes still getting same code
Passenger side timing chain is loose, can almost take off with fingers,
 
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