Ameritrux Posted Thursday at 09:09 PM Share Posted Thursday at 09:09 PM Hello I need some help. I am not very familiar with these Mack engines. I have a 2006 E7 350 in this CV713. We bought it from a guy who said it had a fuel leak and would only start on either. Well after getting i back to the shop and going over it that is not the case. We have verified that it is not losing prime, I have a sight glass on the fuel line and have fuel and no air. I changed the fuel filters. The only thing i noticed was the wires going to the front cam sensor where rubbed through and i repaired them. This engine will start on either and run fine once its started. If you shut it off for a minute it will not restart without either. Can anyone point me in the right direction. Also, mt scan tool will not read off the J1939 only the J1708. Well if it is reading the 1939 it is not working with my Mack software. I do have a generic cose of SID 274 FMI 4 active Quote Link to comment https://www.bigmacktrucks.com/topic/74884-2006-cv713-only-starts-with-either/ Share on other sites More sharing options...
Joey Mack Posted Thursday at 09:51 PM Share Posted Thursday at 09:51 PM (edited) check the sensor in the fly wheel housing near the starter. the wires on the truck side tend to get beat up by debris coming off the steer tire. peel the loom back and inspect. ohm that sensor and the cam sensor.. 900-1500 ohms is good. Please leave the ether in the lawn mower shed... Edited yesterday at 01:14 AM by Joey Mack Pour sperring 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74884-2006-cv713-only-starts-with-either/#findComment-564302 Share on other sites More sharing options...
Ameritrux Posted 14 hours ago Author Share Posted 14 hours ago So I checked the sensor and they are ok. I changed the fuel check valve and i noticed i can push the fuel threw with the primer pump. I think that's odd. It says online it should hold 60 psi. Maybe this new calve is bad from the dealer. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74884-2006-cv713-only-starts-with-either/#findComment-564438 Share on other sites More sharing options...
JoeH Posted 11 hours ago Share Posted 11 hours ago What's your voltage when cranking? EECU shuts off at 9.5 volts. Weak batteries will drop that low when cranking. The ether gets it rolling, letting you ease off starter motor, redirecting voltage to the EECU. Check your battery voltage. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74884-2006-cv713-only-starts-with-either/#findComment-564453 Share on other sites More sharing options...
steeler Posted 8 hours ago Share Posted 8 hours ago What Joe said. I've seen bad grounds, weak connections cause this very issue. During cranking voltage can drop too low to start. Quote Link to comment https://www.bigmacktrucks.com/topic/74884-2006-cv713-only-starts-with-either/#findComment-564457 Share on other sites More sharing options...
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