Rsc1717

No codes , how would I be able to check for the injectors the cut out test ? I just thru a six pack in there a couple of months ago .

Have a 2014 cxu with the mp8 , this has happened twice turn on truck in the morning and starts up just fine , but after a couple of minutes it starts getting like a rough idle and then I try to give it some gas and it won’t settle down . So I turn it off and on again and it’s gone . Done it like three times In a row already wondering what this is .

Don’t know upsman , don’t have any codes it could be that, it’s weird how it comes and goes . But really gets worse when that temp goes high and boost only gets to 26 - 28 psi temp almost gets to 800f exhaust temp

Their is no soot leaking , or squeal or hissing , I don’t want to say it’s the bump that fixed it but problem does come and go .

2014 mack cxu613 mp8

Have noticed that my boost has not been going up like it used too and throttle response is not there . It seems like it does later in the day first load always seems good then as the day goes it gets worse I used to get 35 to 36 psi of boost now I only get 31 to 32 most of the time sometimes I do see 35 but drops and dosent maintain. Also have noticed that when it gets real bad my exhaust temp gets pretty high and when that temp is high I just get about 26 psi and don’t feel the power their . Don’t know what’s going on . I did have p0401 code recently . I changed sensor and cleaned egr and it went away . Yesterday I did notice that I hit a bump on the road and my power came back don’t know if something moved with the bump or it’s just going on /off . Recent work done was injectors and cups hard starts went away . Let me know what you guys think is going. Also something else have noticed my oil pressure drops down to 19 psi when I come to stop after a run but after a couple of minutes or so it maintain at 23 psi at idle . Did notice a little of oil from we’re the oil pressure sensors connects I guess it has a little leak just ordered it to change it .

Here is the cup puller I used had issues with the Ferrum tool as well . The problem is with the Ferrum tool you cannot tighten it up much or it will lose its grip and fail . So best choice make threads nice and slow put grease while making threads so shavings stick to grease without failing on cylinder . I used that high pressure grease you are going to use to install cups .

I sure will let you know how everything turns out . thanks

Thanks Mack pro , yeah I found the tool online at freedom racing like for 270 I believe , I haven’t purchased . I’ll look into Thanks .

FJH, the hard starting went away as soon as I did the cups it’s gone starts right up anytime . But that sensor did get hit with something and it does have some shavings so who knows . I will pay attention to rattling at rear .

Yeah ónix , on this one I’ll probably just leave it to them to take care of it not worth buying tool for just one sensor lol. Yeah and you’re right thats why I usually tackle my own jobs ,one because I like learning and also making sure no corners were cut . But with all the special tooling it makes it a little difficult and also got to have the correct scanning tools on top of it .

Thanks ónix just been having a lot of issues coming up with This truck getting to them one by one . I’ll order the tool and go from there . Thanks making another post about code p0410 that came back today .

I put the old one back the same way it was just showing pic of it how would I be able to tell if it’s making contact, I put it in don't seem like it’s touching anything do you think that one is bad Joey mack seems like it got hit in the corner . I know you need a tool to install new one don’t have it .

Got a change to pull the sensor off while doing the cups and injectors I’m attaching some pics let me know what you think .

Got done today, truck runs good and starts right up . Tomorrow going to go program injectors . Thanks everybody for the help .