Rsc1717 Posted February 25, 2023 Share Posted February 25, 2023 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 . Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/ Share on other sites More sharing options...
Joey Mack Posted February 25, 2023 Share Posted February 25, 2023 Make/ Model/ Year/ Engine?.. Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/#findComment-526041 Share on other sites More sharing options...
Rsc1717 Posted February 26, 2023 Author Share Posted February 26, 2023 2014 mack cxu613 mp8 Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/#findComment-526099 Share on other sites More sharing options...
Joey Mack Posted February 26, 2023 Share Posted February 26, 2023 (edited) The guys that know these, will be along soon... jojo Edited February 26, 2023 by Joey Mack poor sperring.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/#findComment-526103 Share on other sites More sharing options...
Joey Mack Posted February 26, 2023 Share Posted February 26, 2023 so you hit a bump and power came back?? that sounds like a loose wire or bad sensor. have you checked the grounds under the hood and behind the dash? all those wires are gray. Do you see soot leaking from the exhaust at the pipe joints? Do you hear a squeal or hissing when the problem occurs? That's about all I can think of for simple free checks.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/#findComment-526104 Share on other sites More sharing options...
Rsc1717 Posted February 26, 2023 Author Share Posted February 26, 2023 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 . Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/#findComment-526111 Share on other sites More sharing options...
Joey Mack Posted February 26, 2023 Share Posted February 26, 2023 ok Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/#findComment-526112 Share on other sites More sharing options...
upsman Posted February 26, 2023 Share Posted February 26, 2023 DPF plugging up? Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/#findComment-526124 Share on other sites More sharing options...
Rsc1717 Posted February 27, 2023 Author Share Posted February 27, 2023 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 Quote Link to comment https://www.bigmacktrucks.com/topic/72545-losing-boost-power/#findComment-526144 Share on other sites More sharing options...
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