tkaysjr Posted June 8, 2015 Share Posted June 8, 2015 Has anybody had a E427 start quick revving at an idle? Can't figure out what is going on. Something electrical I think but not sure if its the throttle pedal or a sensor someplace. Any help would b appreciated. Thanks ,TedSent from my XT1080 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/ Share on other sites More sharing options...
wheeler73 Posted June 11, 2015 Share Posted June 11, 2015 What year is it. How high does it go to and is there any throttle response? Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-292898 Share on other sites More sharing options...
Dirtymilkman Posted June 11, 2015 Share Posted June 11, 2015 I had a vmac 2 doing that, then the injector pump went to hell Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-292907 Share on other sites More sharing options...
tkaysjr Posted June 12, 2015 Author Share Posted June 12, 2015 What year is it. How high does it go to and is there any throttle response?The rmps very some times it goes to 1000 to 1200 very seldom any higher than that. If I bump up the rmps when sitting it doesn't do it. Just at an idleSent from my XT1080 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-293076 Share on other sites More sharing options...
tkaysjr Posted June 12, 2015 Author Share Posted June 12, 2015 The rmps very some times it goes to 1000 to 1200 very seldom any higher than that. If I bump up the rmps when sitting it doesn't do it. Just at an idleSent from my XT1080 using TapatalkIt's a 96 ch613Sent from my XT1080 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-293077 Share on other sites More sharing options...
tkaysjr Posted June 12, 2015 Author Share Posted June 12, 2015 I had a vmac 2 doing that, then the injector pump went to hellReally. We been fighting this for a few months. Every now and then it will start jumping going down the road it did it to me last night but u lay into the fuel it goes away or let off it goes away. Very puzzled any response is appreciated.Sent from my XT1080 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-293079 Share on other sites More sharing options...
tkaysjr Posted June 12, 2015 Author Share Posted June 12, 2015 It was doing it real bad we found a crack in the block behind the fuel pump so we changed motors (we had a spare) and it started it with this motor now. Electrical possible? Sent from my XT1080 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-293081 Share on other sites More sharing options...
theakerstwo Posted June 12, 2015 Share Posted June 12, 2015 Take it to mack and have them to monitor the TPS. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-293102 Share on other sites More sharing options...
tkaysjr Posted June 12, 2015 Author Share Posted June 12, 2015 I will try that. The Mack dealer keeps telling me to keep the underside of the pedal clean from dirt. Even at that it still does it but I'll have them look at the tpsSent from my XT1080 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-293127 Share on other sites More sharing options...
Dirtymilkman Posted June 13, 2015 Share Posted June 13, 2015 On vmac 1&2 instead of a spring governor setup in the injector pump its controlled by electric servos. And they can go bad. I still think vmac2 is one of the best setups mack had. Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-293153 Share on other sites More sharing options...
tkaysjr Posted July 1, 2015 Author Share Posted July 1, 2015 On vmac 1&2 instead of a spring governor setup in the injector pump its controlled by electric servos. And they can go bad. I still think vmac2 is one of the best setups mack had.I changed the throttle pedal and it still does it I think I'm gonna have the injector pump looked atSent from my XT1080 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-295126 Share on other sites More sharing options...
theakerstwo Posted July 1, 2015 Share Posted July 1, 2015 That is one way of testing parts but another way would have been take it to mack and they could have monitored the tps and said yes or no for being bad. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-295159 Share on other sites More sharing options...
tkaysjr Posted July 1, 2015 Author Share Posted July 1, 2015 That is one way of testing parts but another way would have been take it to mack and they could have monitored the tps and said yes or no for being bad.Hell the Mack dealer around here says they have no idea why it does that. I found a loose plug on the fuel pump last night. Sent from my XT1080 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-295185 Share on other sites More sharing options...
tkaysjr Posted August 24, 2015 Author Share Posted August 24, 2015 I found a broken wire in the wiring harness. I replaced the entire wire harness and fixed the problem. Thanks for all the adviseSent from my XT1080 using Tapatalk 1 Quote Link to comment https://www.bigmacktrucks.com/topic/40379-e427-mack-revving-issue/#findComment-301297 Share on other sites More sharing options...
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