hard to start after stc

[lmc122]

I just replaced the stc fitting and stand pipes/dummy plugs in a 2006 6.0l, the truck had a hpop leak. Once done the truck took 3 or 4 minutes of cranking to start, did it have to get the air out and is that normal? After first start I only drove it a few miles it ran fine. The next day I tried to start it and it took a couple of minutes to start again, drove it for about 40 minutes. It will now start quicker but still seems to be cranking a lot more then it should about the same as before “I fixed it”. Seems like it idles rougher too, will it get better the more I drive it or is there something else wrong maybe the ipc or ipr ?

[kjdowning18]

It could just need to get the air out of the system from when u had everything drained out of it doing the work..... I was told by a ford master diesel tech to run the piss out of it for a little after changing my stc fitting.... I did and have had no problems with starts since jmo


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[lmc122]

I've drove the truck enough to get the air out of the system, and it's still hard to start hot and cold. I can also hear a deep knock coming from the pasinger side rear is that the hpopgoing bad?

[dannyboy950]

Only way to know for shure is have it scanned with a real scanner on live data while cranking. See what the PCM is seeing.