Kevin_Rymwid Posted November 6, 2015 Share Posted November 6, 2015 So I got another weird one here... 05 6.0 came in runs rough when engine is cold. Cust states ran rough for a little while now, he changed oil then it got worse and also then started to have blue/black smoke when running rough. When warms up all ok no problem. I can not verify smoke. I can verify the rough running for a minute or so. Also has a bit of a hard start. It does run rough after the first minute but only above 1000 rpm. at idle is fine. Power balance shows 1 and 6 cutting out above 1000 rpm intermittently. Codes listed: p0232 - fuel pump secondary circuit p0401 - egr insufficient flow p0404 - egr valve performance p0528 - cooling fan speed sensor Could the low side fuel pump cause the injectors to miss? Once the truck is fully warmed up no issues. ICP is fine, IPR is fine even when cranking all is ok. FICM voltage is 49.5 volts. I don't have a fuel pressure tester for one of these, I've read that weak fuel pumps can cause weird issues but not sure about this one. Thanks in advance yall Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted November 7, 2015 Share Posted November 7, 2015 Usually it's injectors when cold start performance issues clear up when the engine gets to operating temperature. Checking fuel pressure is a must. Quote Link to comment Share on other sites More sharing options...
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