Kyle 537 Posted April 28, 2014 Share Posted April 28, 2014 What is good Egr diff psi?? Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/ Share on other sites More sharing options...
Kyle 537 Posted April 28, 2014 Author Share Posted April 28, 2014 I have 3.49 with the valve and about 3.46 to 3.48 with it open. Any ideas. 08 chu613 Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243612 Share on other sites More sharing options...
wheeler73 Posted April 29, 2014 Share Posted April 29, 2014 Key on engine off it should read below 0.05 and running with the egr closed about 0.08-0.1 . That is from looking at many. Also does not matter if it is a MP7 or MP8 Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243690 Share on other sites More sharing options...
Kyle 537 Posted April 30, 2014 Author Share Posted April 30, 2014 Awesome. So this was reading way high koe was 3.49 also. what could cause this tech already r&r the diff sensor, Venturi tube and ports are clean. I was thinking Egr valve problem. Butnow Idk what to think. Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243798 Share on other sites More sharing options...
wheeler73 Posted April 30, 2014 Share Posted April 30, 2014 Does the truck idle a lot? How many hours on it? I see a lot of sensors go bad also see the egr coolers get extremely dirty if the truck idles a lot. I have a way to clean the egr coolers on the truck. Let me know if you would like to know how? Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243805 Share on other sites More sharing options...
staxx Posted April 30, 2014 Share Posted April 30, 2014 tell me tell me please..... Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243807 Share on other sites More sharing options...
wheeler73 Posted April 30, 2014 Share Posted April 30, 2014 Here are links to youtube videos I posted for Mack engineering to see. http://m.youtube.com/watch?v=W9J9Hi-juLk and http://m.youtube.com/watch?v=H9eHF1QZ2a0. If they dont work go on you tube and search MP7 egr cooler cleaning. I am new to this so bear with me. It works on MP8 also just have to set it upma little different. It works very well. We also did this with ASET AC engines. Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243809 Share on other sites More sharing options...
wheeler73 Posted April 30, 2014 Share Posted April 30, 2014 I used an old AC motor mass flow tube cut to attach the cheetah to the truck. Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243810 Share on other sites More sharing options...
Kyle 537 Posted April 30, 2014 Author Share Posted April 30, 2014 No sir not much at all the cooler is clean. I did replace it on this unit last year along with new Venturi and diff tsensor. When I looked int the cooler I found small amount of water no coolest May condensation ?? Yea I've have seen that video that awesome. I tried to get the boss to buy a cheetah and stuff the rigg it up but they are to cheep, maybe when we have to have it. Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243815 Share on other sites More sharing options...
wheeler73 Posted April 30, 2014 Share Posted April 30, 2014 Yes it probably is condensation if it is only a small amount. Replace the sensor as they go bad all the time and re-test the system. The system in my opinion is a bad design as Ford used a similar system years ago on cars and light trucks without a egr cooler and had a lot of sensor issues. Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243822 Share on other sites More sharing options...
wheeler73 Posted April 30, 2014 Share Posted April 30, 2014 Is this a MP7 or MP8? Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243823 Share on other sites More sharing options...
Kyle 537 Posted April 30, 2014 Author Share Posted April 30, 2014 8 and the tech replace the sensor already. Maybe a harness issue? Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243831 Share on other sites More sharing options...
wheeler73 Posted April 30, 2014 Share Posted April 30, 2014 Harness or EECU. Do you have guided diagnostics and the breakout boxes and are there any codes? Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243839 Share on other sites More sharing options...
wheeler73 Posted April 30, 2014 Share Posted April 30, 2014 Check the EECU for oil intrusion. See that alot and will cause incorrect sensor readings. You can clean the oil out of the EECU and connectors with contact cleaner. There is a bullitin to install an oil level jumper harness and replace the oil level sensor. Also have seen the oil pressure sensor and piston oil cooling pressure sensor pushing oil and there is a bullitin on a jumper harness for the oil pressure sensor. Also the bullitins state the harness does not need to be replaced. We change the harness and EECU if it is not a warranty repair as the oil wicks back out of the EECU and harness. Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243843 Share on other sites More sharing options...
wheeler73 Posted May 1, 2014 Share Posted May 1, 2014 Let us know what you find. Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243921 Share on other sites More sharing options...
Kyle 537 Posted May 1, 2014 Author Share Posted May 1, 2014 Ok another guys workin on it. I have an isx to put together. But I'm helping all I can. I'll let us know. Quote Link to comment https://www.bigmacktrucks.com/topic/35551-mp8-egr/#findComment-243938 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.