GoldDog44 Posted 17 hours ago Share Posted 17 hours ago I have 2 2014 CHUs with MP8s. Both deleted. Right after the EGR delete both lost boost pressure and they are short on power. There is what seems to be an exhaust leak whistle on both and the turbos are sluggish. Can’t get more that 31 psi. There is no black soot trail that would point out the exhaust leak. Does anyone know if there is a way to back pressurize the exhaust through the turbo to find any leaks? Has it been done before? I changed both exhaust manifolds to remedy the issue and still no dice. I’m thinking it’s the EGR blocker plate but like I said there is no sign of soot anywhere. Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/ Share on other sites More sharing options...
fjh Posted 8 hours ago Share Posted 8 hours ago 8 hours ago, GoldDog44 said: I have 2 2014 CHUs with MP8s. Both deleted. Right after the EGR delete both lost boost pressure and they are short on power. There is what seems to be an exhaust leak whistle on both and the turbos are sluggish. Can’t get more that 31 psi. There is no black soot trail that would point out the exhaust leak. Does anyone know if there is a way to back pressurize the exhaust through the turbo to find any leaks? Has it been done before? I changed both exhaust manifolds to remedy the issue and still no dice. I’m thinking it’s the EGR blocker plate but like I said there is no sign of soot anywhere. Have you checked the intake side at the front for broken or missing bolts or cracked manifold? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579022 Share on other sites More sharing options...
GoldDog44 Posted 7 hours ago Author Share Posted 7 hours ago The intake side has been full gone through. 2 charge coolers and everything checked with soap water. Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579024 Share on other sites More sharing options...
fjh Posted 7 hours ago Share Posted 7 hours ago Can you notice this sound at idle? If so run a garden hose over all of the exhaust side joints turbo gasket too and listen for the sound to change! Use common sense don’t do it on a sreamin hot manifold? Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579025 Share on other sites More sharing options...
Joey Mack Posted 6 hours ago Share Posted 6 hours ago Have you looked at the wires to the boost sensor in the intake manifold? fjh, makes some good points . Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579030 Share on other sites More sharing options...
Jeffrey 34 Posted 6 hours ago Share Posted 6 hours ago Which one would be the boost sensor Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579032 Share on other sites More sharing options...
fjh Posted 5 hours ago Share Posted 5 hours ago 26 minutes ago, Jeffrey 34 said: Which one would be the boost sensor Inlet manifold! Let’s chase the sound first bro! Doubt the boost sensor for sound Joey no offence please! I know we’re both trying to help! Water at every gasket and joint even the egr cooler and tubing! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579038 Share on other sites More sharing options...
Joey Mack Posted 5 hours ago Share Posted 5 hours ago I dont remember, i think it has 3 wires. Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579047 Share on other sites More sharing options...
Joey Mack Posted 5 hours ago Share Posted 5 hours ago (edited) Yep. Gotcha fjh. Was thinkin about a broken wire .. all good, and i am posting on 2 of his threads, so i may get them mixed up too. 🤔 Edited 4 hours ago by Joey Mack Pour sell fone sperring 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579048 Share on other sites More sharing options...
fjh Posted 4 hours ago Share Posted 4 hours ago 1 hour ago, Joey Mack said: Uep. Gotcha fjh. Was thinkin about a broken wire .. all good, and i am oosting on 2 of his threads, so i may get them mixed up too. 🤔 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579052 Share on other sites More sharing options...
GoldDog44 Posted 33 minutes ago Author Share Posted 33 minutes ago 6 hours ago, fjh said: Can you notice this sound at idle? If so run a garden hose over all of the exhaust side joints turbo gasket too and listen for the sound to change! Use common sense don’t do it on a sreamin hot manifold? Not audible at idle. You can clearly hear it as soon as there is exhaust pressure. Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579092 Share on other sites More sharing options...
Joey Mack Posted 27 minutes ago Share Posted 27 minutes ago fjh,, i thank you for the respect. I read this over again. No magic bullet. Was wondering if the o- rings off the turbo to the CAC have failed. They will squeal or scream when boost leaks out.. Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579093 Share on other sites More sharing options...
fjh Posted 9 minutes ago Share Posted 9 minutes ago 11 minutes ago, Joey Mack said: fjh,, i thank you for the respect. I read this over again. No magic bullet. Was wondering if the o- rings off the turbo to the CAC have failed. They will squeal or scream when boost leaks out.. all good bro ! It’s a possibility! Not sure what tools he has but you can put pressure on the charge air on the compressor side and if you have the engine winder turn the engine by hand till you find the spot where the boost will build on the guage you may be able to pick this out with the water trick! I’ve only ever done it once on the red engine used to do it all the time on the gray engine! I’m like you I’m a gray guy in more ways than one!😂 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75783-mp8-low-boost/#findComment-579097 Share on other sites More sharing options...
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