C-15 seems to have a miss and loss of power

The problem was a broken spring on #6 injector.

 

Well I wasted last Monday and Tuesday at LaVergne, TN Thompson CAT. Cost me $630 to ride down the road for an hour cutting out injectors and then a dyno run that they said they couldn't even complete due to my engine modifications. They're not my go to shop but they could get to it Monday and my go to Manchester shop couldn't look until Wednesday. Manchester is the only people I trust and I know they do good work but I didn't want to wait until Wednesday.

So last week LaVergne didn't find anything. I called Manchester and told him what they did and it was disappointing they couldn't or wouldn't find my issue over some silly engine modifications that had been that way for years and were never a problem. He said bring it to them this past Monday and they'd look at it.

So yesterday we took it over Monteagle up and down both sides twice so I could get it to repeat the miss I hear on long pulls. I had my trailer hooked, it was empty tho, and had a helluva a time pushing it to repeat the problem but I got it to do it twice that last p4ull.

But really that was a waste of time. Before we even got to Monteagle when we first got on the interstate he cut the injectors one by one and pinpointed #6 as weak. I dunno why LaVergne didn't hear it. So we let it sit overnight and this morning they were to check the overhead adjustment, have a look see and go from there. They found the broken spring. He's not charging,me for 2 hours of joyriding over Monteagle yesterday after knowing what LaVergne did or didn't do. Some labor and a new injector. They didn't have an,injector on the shelf but will have one in the morning I should be good to go by lunch tomorrow.

 

I intend to buy a troubleshooting and diagnostic CD like SAR suggested in an earlier comment in this post. An injector height tool, barring tool and feeler gauge too. Really after having this truck almost 10 years now there's no excuse for not already having that stuff. I just didn't have the time or money to do a quick crash course on it myself in the here and now. These past few weeks I've just been running some freight close to home covering expenses and getting my truck looked at as I could. This set me back several weeks of normal income the time that I've lost to this. Admittedly I've been a tad lazy this winter too. Time to get busy now. Appreciate everyone's input. Fingers crossed that this problem is all solved by the time I get my truck back tomorrow.