ou812jk Posted June 30, 2018 Share Posted June 30, 2018 2001 E7 400 was running fine started to miss and backfire like jake stuck on remove wires to jakes still does it backed off on jake adjustment still missing removed external oil lines evened removed solenoids still missing Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/ Share on other sites More sharing options...
Dirtymilkman Posted June 30, 2018 Share Posted June 30, 2018 Split injector tip. Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-401641 Share on other sites More sharing options...
wilbur Posted July 1, 2018 Share Posted July 1, 2018 or bent valve. Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-401684 Share on other sites More sharing options...
ou812jk Posted July 1, 2018 Author Share Posted July 1, 2018 at first when I started it up ran smooth till oil pressure got up to valves not long then started to miss again thats why i thought jakes Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-401686 Share on other sites More sharing options...
Dirtymilkman Posted July 1, 2018 Share Posted July 1, 2018 When a injector tip breaks or cracks fuel will drip almost all the time. It'll sound like a stuck Jake. Motor may even keep running for awhile after key is shut off. Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-401716 Share on other sites More sharing options...
fjh Posted July 4, 2018 Share Posted July 4, 2018 what color is the smoke if any ? should be gray blue eye burning type smoke if compression related. should be gray black fuel related in most cases! Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-401894 Share on other sites More sharing options...
Superken74 Posted July 19, 2020 Share Posted July 19, 2020 I’m having the same issue with my 2006 aset engine. It idles fine but when I rev it up to 1200 or more it starts to miss and backfire. It smokes like a freight train and smells like kerosene. How can you tell which injector is bad? I tried breaking the fuel lines while it was running and I notice they all made the truck idle rough. Do you have to remove each one and will you be able to visual see if it is damaged? Or could it be something else. Please help. Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-456145 Share on other sites More sharing options...
fjh Posted July 19, 2020 Share Posted July 19, 2020 In your case remove the valve cover and check for broken rocker shaft bolts! Just my opinion! the new engines had an issue in this department ! Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-456148 Share on other sites More sharing options...
Superken74 Posted July 19, 2020 Share Posted July 19, 2020 I checked the rocker arms. They are good. I had someone plug it into a computer and it shows injector 1 bad. I replaced the injector yesterday with a remack but it still spudders after 1200rpm Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-456157 Share on other sites More sharing options...
fjh Posted July 20, 2020 Share Posted July 20, 2020 The computer Will likly show a bad pump not the injector! u still may have a bad pump if you changed an injector! just sayin 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-456235 Share on other sites More sharing options...
Macktech20 Posted July 27, 2020 Share Posted July 27, 2020 I just worked on a 99 CH613 that had a bad transfer pump causing a misfire 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-456783 Share on other sites More sharing options...
fjh Posted July 27, 2020 Share Posted July 27, 2020 11 hours ago, Macktech20 said: I just worked on a 99 CH613 that had a bad transfer pump causing a misfire That is a possibility ! Should show up a low fuel pressure! Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-456816 Share on other sites More sharing options...
Bliue dm Posted August 8, 2020 Share Posted August 8, 2020 Timing sensor on flywheel. Clean it and see if it makes a difference. If it does. Replace it Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-457985 Share on other sites More sharing options...
Jamkar Posted August 9, 2020 Share Posted August 9, 2020 Any blink codes? Quote Link to comment https://www.bigmacktrucks.com/topic/53702-2001-mack-e7-400-missing-and-backfiring/#findComment-458002 Share on other sites More sharing options...
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