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Started with a major miss at idle and no power when i give it some throttle. Put it on the scan tool and got #1 and # 5 injectors not firing. Changed all injectors... same problem but code changed to #4 injector not firing. Warrantied the injector put the new ( reman) injector in... same problem and code. Changed injector pump and lift pump... same problem same code. Found out the injection pump was faulty... warrantied that... same miss but no codes. Heres where it gets interesting. Hook up the snap on solus and individually dissable the injectors... #1 no change, #2 no change, #3 idle gets smoother when dissabled???, #4-6 idle gets rougher when dissabled. i checked all the wiring... seems to be in good condition(havent checked continuity at every connection and yes im avoiding the dredded short search). Checked valve lash, and compression... all good. no smoke of anykind nor is the oil level changing. I and just about every diesel mechanic i know are stummped. I have poured over $3k into this truck and am determined to conquer this issue but I am stuck Please help!! Thanks
 

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Do you have a programmer on the truck? If so take it off. I just got my '04 out of the shop and the programmer was not working correctly. it was causing the MAPP sensor to freak out making it run lean and idle rough and miss. The mechanic took the programmer off and it was still missing/idling rough. He changed the crank sensor and it runs like new now. I wish i could help more than this but I've had a miss for quite some time and finally it started really acting up. Hope this helps
 

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Do you have a programmer on the truck? If so take it off. I just got my '04 out of the shop and the programmer was not working correctly. it was causing the MAPP sensor to freak out making it run lean and idle rough and miss. The mechanic took the programmer off and it was still missing/idling rough. He changed the crank sensor and it runs like new now. I wish i could help more than this but I've had a miss for quite some time and finally it started really acting up. Hope this helps


Truck is bone stock. Did yours throw a code? Did you change the MAPP sensor also?
 
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