wilbur Posted August 12, 2019 Share Posted August 12, 2019 2000 CH 460 When I take off after sitting a bit ,like for a stop light I get a little sputter for a second and sometimes a little pop. It only does it in the lower gears and if I ease into the throttle it doesnt do it at all. Mack says there is a file called a smoke file that could of gotten a glitch in it. They want to reload the file and see. If that aint it he says replace all the eup pumps. What do you pros think.? Another thing NO Codes. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/ Share on other sites More sharing options...
fjh Posted August 12, 2019 Share Posted August 12, 2019 You could try the download how ever if your truck has the XT file you it will not be replaced wit the extra torque file I would have the fuel pressure checked first! Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-429922 Share on other sites More sharing options...
wilbur Posted August 12, 2019 Author Share Posted August 12, 2019 Doesnt have the XT file. When you say fuel pressure do you mean from the supply pump.? The supply pump is new as of a few months ago.. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-429926 Share on other sites More sharing options...
fjh Posted August 12, 2019 Share Posted August 12, 2019 (edited) Yes fuel supply pressure!What colour smoke comes out when the miss occurs!if it doesn’t have the xt engine file then do the download! Edited August 12, 2019 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-429933 Share on other sites More sharing options...
Dirtymilkman Posted August 13, 2019 Share Posted August 13, 2019 My 2000 cl when it was new would stumble at random times. A reflash fixed it. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-429948 Share on other sites More sharing options...
Mack Technician Posted August 13, 2019 Share Posted August 13, 2019 I’d do per FJH recommendation and if nothing else is found install (solder) a 1K ohm resistor in the intake sensor line at the sensor. It will change your emissions slightly, but eliminate the stumble and won’t hurt (possibly improve) performance. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-429963 Share on other sites More sharing options...
wilbur Posted August 14, 2019 Author Share Posted August 14, 2019 You talking about the sensor that goes in the intake manifold.? Just cut a wire and splice in the resistor.? Does it matter which wire.? Where would I get a resistor like that? could you send me a link, Please Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-430081 Share on other sites More sharing options...
wilbur Posted August 14, 2019 Author Share Posted August 14, 2019 On 8/12/2019 at 6:22 PM, fjh said: Yes fuel supply pressure!What colour smoke comes out when the miss occurs!if it doesn’t have the xt engine file then do the download! Cant tell I put an under side exhaust on it and cant see it. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-430082 Share on other sites More sharing options...
wilbur Posted August 14, 2019 Author Share Posted August 14, 2019 Is this right.? https://www.ebay.com/itm/10-x-1k-Ohm-Carbon-Film-Resistors-1-2-Watt-5-1K-Fast-USA-Shipping/171349641402?_trkparms=ispr%3D1&hash=item27e53c08ba:g:2N0AAOxyTMdTLcZy:sc:USPSFirstClass!60411!US!-1&enc=AQAEAAAB0BPxNw%2BVj6nta7CKEs3N0qXGmLFe0EKDgGgCV9YiAWxhuPPm%2Fi%2Bjt9jVR8s8ZZU%2BQqkBzrJVOV8bCzvGvHzTSj1wGijKtydBnjz6j2kfaVtYnwR4hTb%2BFBVgl65htbuOVy2egDJnCwUf7DCQ8W8IP50h7UxwE8kCTmj5HWwlcNX3fnlD7yGCMyWfbMkdEh3F%2BHCjrvsyyFZ6024YvDFp1EOsYWTJ7%2FkdgdZaRjA8VrsSQWn5lmh%2B7TYzSQR7vDmWzqeVI7cXlILZuJ0HJufLYSTNqqcUy6RjoU9iCmr7e%2Fetg%2BnHS20%2B9ZrUsxbg5iTqmv9jvJJ5So9iJfyqbq4y4zwWeMBoP3N8gpZs9oPqa23QBLS6CI1%2BrSR%2BD90VptKHLkOlQHqVx%2F9xZFmtFnmbfc1K2HXveJjDJxa4L%2FZ4TImiN1tfBhqEaOyMDOrZDJdIhl8TybjlrDnOzun9h8Hy%2B9OGC03yEqL04ZtbUKfijmEVq9%2BaI0zWQXxoqMfQACOttfv9VXAbjCRc4nkOcvEEI5MYLhDpT1faqrCZ%2BtP5NRbDhuRMXQy%2BsuUTAVonLkntzrJAvZvX%2B1PYhnEmK5b0QdrGAazj3Ci5d4i3mwhEuyef&checksum=171349641402dadcb90c423949f28e67dadb8f8b1d46 Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-430084 Share on other sites More sharing options...
wilbur Posted August 14, 2019 Author Share Posted August 14, 2019 Dont know much about resistors but the wattage is the size ? Right.? What wattage do i need.? Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-430085 Share on other sites More sharing options...
Mack Technician Posted August 14, 2019 Share Posted August 14, 2019 44 minutes ago, wilbur said: You talking about the sensor that goes in the intake manifold.? Just cut a wire and splice in the resistor.? Does it matter which wire.? Where would I get a resistor like that? could you send me a link, Please Thanks Radio shack. Doesn’t matter which. Leave enough space to take it out if needed. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-430086 Share on other sites More sharing options...
Mack Technician Posted August 14, 2019 Share Posted August 14, 2019 Solder it. No butt connectors. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-430087 Share on other sites More sharing options...
wilbur Posted August 14, 2019 Author Share Posted August 14, 2019 What about the Wattage? Just get a 1K with a heavy enough wire.? Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-430088 Share on other sites More sharing options...
wilbur Posted September 28, 2019 Author Share Posted September 28, 2019 Seems like when they loaded the smoke file is when my mileage went from 5 to 4.5. Its either that file or the new EUPs Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-432977 Share on other sites More sharing options...
Mack Technician Posted September 28, 2019 Share Posted September 28, 2019 The EUP is the slave and the software his master. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-432979 Share on other sites More sharing options...
wilbur Posted September 28, 2019 Author Share Posted September 28, 2019 39 minutes ago, Mack Technician said: The EUP is the slave and the software his master. So which is the culprit and how do i fix it.? Another download.? Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-432983 Share on other sites More sharing options...
Mack Technician Posted September 29, 2019 Share Posted September 29, 2019 Did you do smoke file and resistor? Or just updated software? Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433004 Share on other sites More sharing options...
wilbur Posted September 29, 2019 Author Share Posted September 29, 2019 Just software Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433011 Share on other sites More sharing options...
wilbur Posted September 30, 2019 Author Share Posted September 30, 2019 I talked to the guy at Mack that did the download and he said that was probably the cause of the mileage to go down. And he also said the file cant be removed once its installed. What do you think is he strokin me.? I would think it could be over written but just guessin. Mack technician can you help.? Please. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433106 Share on other sites More sharing options...
OldRedMack Posted October 1, 2019 Share Posted October 1, 2019 For what it's worth, I never had a code for a weak eup. Put new injectors in and developed a miss, still no code. Cracked fuel lines 1 at a time found the problem, changed the number 6 eup, problem went away. Never had a single code pop up. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433131 Share on other sites More sharing options...
Mackpro Posted October 2, 2019 Share Posted October 2, 2019 What the last 6 of your VIN Wilbur. ? There was a “ White Smoke / Misfire” Service file up to and includeing the 2000 year models. Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433227 Share on other sites More sharing options...
wilbur Posted October 2, 2019 Author Share Posted October 2, 2019 133167 Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433242 Share on other sites More sharing options...
wilbur Posted October 2, 2019 Author Share Posted October 2, 2019 Sure would appreciate if you could help. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433251 Share on other sites More sharing options...
wilbur Posted October 3, 2019 Author Share Posted October 3, 2019 I think thats the file mack put in. But now I lost 0.5 miles per gallon. I would like to take the file out or overwrite it somehow to get my mileage back. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433305 Share on other sites More sharing options...
Mackpro Posted October 3, 2019 Share Posted October 3, 2019 My buddy who is still at the dealership said It looks like in the past , the engine ECM data files and software has been updated several times. And the dealer did install the correct file for misfire/ white smoke . To get your old file back the dealership would have to request it through their E-service email system with corporate. Hopefully the dealership and corporate can get it swapped back Quote Link to comment https://www.bigmacktrucks.com/topic/58572-engine-miss/#findComment-433307 Share on other sites More sharing options...
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