Ups mech Posted June 18, 2016 Share Posted June 18, 2016 I'm working on a 2014 Mack pinnacle we are having regen problems cannot get exh temp high enough only get to 300 deg. We replaced pdf filter doser injector dower module and air pressure regulator and air dryer and fuel filters. Mack said dryer when old has particles in air and harms dower module. No codes active or inactive. All test passed. No exh leaks. When in regen mode engine starts to stumble when coolant temp reaches 175 deg. When at idle engine idles smooth. But when you press the throttle it sounds like the engine is loaded up then smokes then clears out. Anyone have any suggestion. Quote Link to comment https://www.bigmacktrucks.com/topic/45712-low-exh-temp-in-regen-mode/ Share on other sites More sharing options...
fjh Posted June 18, 2016 Share Posted June 18, 2016 Do you have Teck tool ? Is the fuel preasure ok ? Quote Link to comment https://www.bigmacktrucks.com/topic/45712-low-exh-temp-in-regen-mode/#findComment-337016 Share on other sites More sharing options...
Ups mech Posted June 18, 2016 Author Share Posted June 18, 2016 Yes we have updated tech tool . Fuel pressure good. Passes all test. No faults. All green lights. Quote Link to comment https://www.bigmacktrucks.com/topic/45712-low-exh-temp-in-regen-mode/#findComment-337041 Share on other sites More sharing options...
turckster Posted June 19, 2016 Share Posted June 19, 2016 Check the EGR diff psi sensor(using ptt2) with the engine not running, should be 0 psi +/-.3 psi. If the egr is flowing, even slightly, it will cause the exhaust temps to cool down. Try following g/d symptom based diagnostics. Quote Link to comment https://www.bigmacktrucks.com/topic/45712-low-exh-temp-in-regen-mode/#findComment-337084 Share on other sites More sharing options...
Ups mech Posted June 20, 2016 Author Share Posted June 20, 2016 Thx I will try this Quote Link to comment https://www.bigmacktrucks.com/topic/45712-low-exh-temp-in-regen-mode/#findComment-337207 Share on other sites More sharing options...
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