kdbeen Posted July 23, 2012 Share Posted July 23, 2012 hello we have a 98 mack ch-613 truck with a E7-460 engine. we bought at a auction as is with the engine not running, was told had a possible bad engine electronic ecu. did read the fault codes and it did have 2 codes relating to the ecu controller and one for the data link. checked for voltage and grounds at the ecu according to the wiring schematic. all looked ok there, installed a good used ecu and still no start. still have same active fault codes with the used ecu. do have 80 psi fuel pressure, cracked all fuel line one at a time at the cylinder head and had what i think is good fuel there plus some air as they had ran one fuel tank completely dry, but i believe i have gotten all air removed. no black smoke at the exhaust. sometimes it will hit a few times but by the time you let off the key it has died. and by the way it will start and run on either just fine. any suggestions will be appreciated. thank you. Quote Link to comment https://www.bigmacktrucks.com/topic/26371-e7-460-mack-engine-no-start/ Share on other sites More sharing options...
jklj Posted July 23, 2012 Share Posted July 23, 2012 You might try checking the voltage at silenoid in the dash by the fuse box i had that happen to one of my trucks last week it showed 1.5 volts and would not start good luck. Quote Link to comment https://www.bigmacktrucks.com/topic/26371-e7-460-mack-engine-no-start/#findComment-130120 Share on other sites More sharing options...
kdbeen Posted July 23, 2012 Author Share Posted July 23, 2012 ok. thank you very much for the info. Quote Link to comment https://www.bigmacktrucks.com/topic/26371-e7-460-mack-engine-no-start/#findComment-130140 Share on other sites More sharing options...
burnstransport Posted July 24, 2012 Share Posted July 24, 2012 Had a Navistar DT motor do something similar, happened in dead winter and we thought fuel had gelled but after thawing out in heated shop 2 days and still no start (plenty of fuel in filter) we found a bad fuse under the battery cover seperate from all other fuses, apparently it ran the high pressure injection rail was a 40A Maxi plug in. Changed that and it fired right up but since it wasn't with any other fuses took a while to find. Point is look high and low at all wiring for a small black fuse holder you might get lucky. Look in the weirdest of places, sometimes they're hard to find! Good luck! Quote Link to comment https://www.bigmacktrucks.com/topic/26371-e7-460-mack-engine-no-start/#findComment-130167 Share on other sites More sharing options...
kdbeen Posted July 28, 2012 Author Share Posted July 28, 2012 ok i will dig a little deeper. thanks for the info. Quote Link to comment https://www.bigmacktrucks.com/topic/26371-e7-460-mack-engine-no-start/#findComment-130933 Share on other sites More sharing options...
kdbeen Posted July 31, 2012 Author Share Posted July 31, 2012 just replying back on my post to let anyone whom is concerned that the problem was the VECU module. installed a good used one and engine started right up. thanks to all Quote Link to comment https://www.bigmacktrucks.com/topic/26371-e7-460-mack-engine-no-start/#findComment-131271 Share on other sites More sharing options...
andrew smart Posted July 15, 2020 Share Posted July 15, 2020 J1939 wiring not twisted or shielded,both are required for J1939 standard Quote Link to comment https://www.bigmacktrucks.com/topic/26371-e7-460-mack-engine-no-start/#findComment-455914 Share on other sites More sharing options...
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