CoastalSVCSMike Posted March 11, 2015 Share Posted March 11, 2015 Good morning.I am new to the forum, I work for a Marine Industry based in Norfolk, VA. Among many pieces of our equipment, we have (2) Mack CH613's, one a 1998 and one a 1999. I am having an issue with the 98. Upon first start up, when air pressure is below 60psi, it smokes on first start up and has been for years, then clears up and idle smooths out (takes about 5 seconds). However, now, upon first starting in the morning which has happened more when we were having 20 degree days.....the engine shut down and elec malfunction would come on and after 15-20 seconds it would shut down. If I started it and repeated the process, once it reached about 120 psi and maybe two more shut downs, I could drive the truck with no issues or faults. Now we are passing winter, the days are much warmer and the truck is still having this issue. I have replaced the fuel filter as of now, have not checked it yet as I am getting pulled off to go captain the tug boat..I am not confident draining and replacing the fuel filter is going to resolve my issue. Has anyone had any experience with this in the past? Any insight on where to look and chase. My local MACK dealer has been very unhelpful in getting me a service manual as well as an owners manual which I am willing to pay for!Thanks!Mike Quote Link to comment Share on other sites More sharing options...
dogg rescue Posted March 11, 2015 Share Posted March 11, 2015 The first thing I would check is the coolant level. Make sure it is above the sensor. Also try looping a wire into both ends of the plug in to see if the problems go away, and see if it's a bad sensor. Quote Link to comment Share on other sites More sharing options...
turckster Posted March 11, 2015 Share Posted March 11, 2015 Three things will shut down an engine: oil pressure, coolant level and coolant temp. Depending of the software step or version the transmission temp can shut down an engine too. As stated above, coolant level is the most common reason for shut down, be it a sensor issue or actual coolant level. Sometimes during the cold weather the coolant is slightly below the sensor, but after a little heat in the cooling system, it expands enough to cover the sensor probes. Quote Link to comment Share on other sites More sharing options...
CoastalSVCSMike Posted March 11, 2015 Author Share Posted March 11, 2015 I appreciate the insight fella's. I will try this and recheck in the morning on cold start and report back to you guys. Quote Link to comment Share on other sites More sharing options...
CoastalSVCSMike Posted March 11, 2015 Author Share Posted March 11, 2015 I found the coolant level sensor was gummed up, I cleaned it and refilled the bottle. So far repair worked, however, will know for sure tomorrow morning. Quote Link to comment Share on other sites More sharing options...
CoastalSVCSMike Posted March 12, 2015 Author Share Posted March 12, 2015 Problem is no longer around. Thanks! Quote Link to comment Share on other sites More sharing options...
Keffer inc Posted March 15, 2015 Share Posted March 15, 2015 Cool deal, my dad's '94 always had a rough idle for 5 seconds after start up, I guess thats just normal for our trucks. but my '99 doesn't so I don't know. Quote Link to comment Share on other sites More sharing options...
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