MackWorld Posted February 20, 2013 Share Posted February 20, 2013 One of my Dump Trucks was involved in a major frontal collision. The front bumper, Hood, Rad, and Driver Side steering arm were damaged. Otherwise, no other visible or mechanical damage was observed. The Mechanic believes all mechanicals have been repaired but the engine would not start. We have two different electricians have a go at it and nothing has been found. One thing that was noted is that there is no current to the Injectors (Electronic Unit Pumps - EUP). The engine is an E7 350 with Electronic Injection. Current view is that the problem is electrical in nature. I would appreciate any advise from this forum on hour to diagnose this problem further. Thanks a lot. Quote Link to comment https://www.bigmacktrucks.com/topic/30068-e7-350-engine-wont-start-on-mack-ch613-after-repair-from-a-major-accident/ Share on other sites More sharing options...
Superdog Posted February 20, 2013 Share Posted February 20, 2013 Will it crank and not fire or not crank at all?I had trouble once with the Etech in my '99 CH,crank over fine but wouldn't run,I was able to pull start it,though.Took the plug off were it screws in the ECM and sprayed in with electric contact cleaner,screwed it back in and all was well. Quote Link to comment https://www.bigmacktrucks.com/topic/30068-e7-350-engine-wont-start-on-mack-ch613-after-repair-from-a-major-accident/#findComment-166370 Share on other sites More sharing options...
theakerstwo Posted February 21, 2013 Share Posted February 21, 2013 Make sure the batterys are good and fully charged and all cables are conneted. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/30068-e7-350-engine-wont-start-on-mack-ch613-after-repair-from-a-major-accident/#findComment-166380 Share on other sites More sharing options...
Challenger Posted February 22, 2013 Share Posted February 22, 2013 I've seen Engine ECU's fail after wrecks, the wreck can cause internal damage. You could swap the EECU out with another truck's EECU. Quote Link to comment https://www.bigmacktrucks.com/topic/30068-e7-350-engine-wont-start-on-mack-ch613-after-repair-from-a-major-accident/#findComment-166922 Share on other sites More sharing options...
theakerstwo Posted February 23, 2013 Share Posted February 23, 2013 I have seen ECMs go bad after welding on the truck also. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/30068-e7-350-engine-wont-start-on-mack-ch613-after-repair-from-a-major-accident/#findComment-166953 Share on other sites More sharing options...
Ahubbard Posted March 10, 2013 Share Posted March 10, 2013 What about the sensor on the front cover where the cam is. I think it has something to do with the timing at which the EUPs pop. Could it have been damaged? Quote Link to comment https://www.bigmacktrucks.com/topic/30068-e7-350-engine-wont-start-on-mack-ch613-after-repair-from-a-major-accident/#findComment-171084 Share on other sites More sharing options...
jklj Posted March 10, 2013 Share Posted March 10, 2013 Did you check the solenoid by the fuse box we have had that trouble on our ch Quote Link to comment https://www.bigmacktrucks.com/topic/30068-e7-350-engine-wont-start-on-mack-ch613-after-repair-from-a-major-accident/#findComment-171211 Share on other sites More sharing options...
skip Posted March 12, 2013 Share Posted March 12, 2013 Like old mate said, check the sensor on the side of the front cover for the cam. on RHS from memory. Other than that the harness is pretty well protected. If the ECM has had a jolt from a crash it would be worth hooking one up from another truck like mentioned earlier Quote Link to comment https://www.bigmacktrucks.com/topic/30068-e7-350-engine-wont-start-on-mack-ch613-after-repair-from-a-major-accident/#findComment-171612 Share on other sites More sharing options...
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