MackE7760 Posted January 11, 2022 Share Posted January 11, 2022 This morning, checked oil and coolant, both good, cranked right up, 10-15 seconds later, shutdown. Double checked, all good, started again, 2-3 seconds later, 60+ oil pressure, ice cold temp, shuts down. Restarted and kills again (red shutdown light), even with override. Does shutdown system use a different o/p sending unit than gauge? Any ideas? Ran great yesterday 11 hrs Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/ Share on other sites More sharing options...
67RModel Posted January 11, 2022 Share Posted January 11, 2022 It would help to know what year and engine model we are talking about here. Also what engine control system if known VMAC I, VMACII, VMAC III, etc. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486885 Share on other sites More sharing options...
mechohaulic Posted January 11, 2022 Share Posted January 11, 2022 where is this unit located ; are you in sub=zero new england and truck parked outside ? frozen fuel lines? can't help much with the VMAC stuff. i go back to simple kysor shut=down days. if it started right up don't thing its in sub weather. Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486886 Share on other sites More sharing options...
JoeH Posted January 11, 2022 Share Posted January 11, 2022 Thumb is pointing at cab gauge oil signal. Index finger is pointing at computer oil pressure sensor. So yes, 2 separate oil signals. (This is a 2003 ai350. Forget what yours is.) 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486888 Share on other sites More sharing options...
Vmac3 Posted January 11, 2022 Share Posted January 11, 2022 Try unplugging the coolant level sensor, and see if the truck stays running. V Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486889 Share on other sites More sharing options...
67RModel Posted January 11, 2022 Share Posted January 11, 2022 1 hour ago, Vmac3 said: Try unplugging the coolant level sensor, and see if the truck stays running. Wouldn't this be equal to having low coolant? I mean if your trying to diagnose a bad coolant level sensor you need to have voltage or continuity across the plug. Unplugging it is the same as having low coolant level? I think you would want to unplug it and jump the harness plug with a paper clip or other conductive wire. If it starts and runs with the harness plug jumped then you could say the level sensor is malfunctioning. I could be wrong but that is how it works on my non electronic E7 where all the sensors do is give you an alarm and warning light in the cab. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486895 Share on other sites More sharing options...
MackE7760 Posted January 11, 2022 Author Share Posted January 11, 2022 Truck is in South Louisiana, temp was in the 50s at start Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486896 Share on other sites More sharing options...
MackE7760 Posted January 11, 2022 Author Share Posted January 11, 2022 And to make it worse, it’s running fine now. Will check the coolant sensor and plug this afternoon, maybe the cold(cool to most of you IK) made for a bad connection? Got someone trying to see if computer logged the shutdown Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486897 Share on other sites More sharing options...
Popular Post MackE7760 Posted January 11, 2022 Author Popular Post Share Posted January 11, 2022 Ok, computer logged low coolant level, and some injector codes(eup?) Seems my driver forgot to tell me he added coolant yesterday. pressurized cooling system and found a leaking hose behind the blue silicone extended “T” hose, gonna pull her down, flush her out, and change that hose and see if we have any more issues. Thanks for the assistance on this one, JT 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486904 Share on other sites More sharing options...
Vmac3 Posted January 12, 2022 Share Posted January 12, 2022 9 hours ago, 67RModel said: Wouldn't this be equal to having low coolant? I mean if your trying to diagnose a bad coolant level sensor you need to have voltage or continuity across the plug. Unplugging it is the same as having low coolant level? I think you would want to unplug it and jump the harness plug with a paper clip or other conductive wire. If it starts and runs with the harness plug jumped then you could say the level sensor is malfunctioning. I could be wrong but that is how it works on my non electronic E7 where all the sensors do is give you an alarm and warning light in the cab. Sorry about that, I was thinking about the mp powered vehicles where it would log a circuit fault. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486917 Share on other sites More sharing options...
Joey Mack Posted January 12, 2022 Share Posted January 12, 2022 we used to put a paper clip in the sensor plug to test this fault... I've seen them left in,,, trash companies are the worst offender's... Non MP trucks... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69048-engine-shutdown/#findComment-486918 Share on other sites More sharing options...
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