SLEDOG Posted December 4, 2021 Share Posted December 4, 2021 Ran fine until parked for one week. started and ran rough until it stalled. changed both fuel filters, primed pump. will not start.... thanks for any help Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/ Share on other sites More sharing options...
Onyx610 Posted December 4, 2021 Share Posted December 4, 2021 Possibly a engine position sensor or engine speed sensor. Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484076 Share on other sites More sharing options...
SLEDOG Posted December 4, 2021 Author Share Posted December 4, 2021 Is there a good way to check those sensors? Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484078 Share on other sites More sharing options...
Onyx610 Posted December 4, 2021 Share Posted December 4, 2021 You can ohm test them. I believe it’s 200-300 ohms is the in spec range. Also JoeyMack just posted a quick/simple test the other day on these. It was in AI 400 extended crank time. Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484080 Share on other sites More sharing options...
Onyx610 Posted December 4, 2021 Share Posted December 4, 2021 On 12/1/2021 at 8:16 AM, Joey Mack said: Just for kick's.... look at the cam sensor plug and socket (eng. position sensor) Do the same for the crank sensor (R.P.M./ T.D.C. sensor) look for fraying of the wires where it goes into the plug. The R.P.M. sensor may have a 3 pin plug with only 2 wires.. you can also, un-plug one of them and try to start the engine, it will crank for a few seconds before starting, and will run rough when it starts. then plug it back in and un-plug the other sensor, and crank it up. if it does not start, the sensor that Is plugged in is bad. These engines can run on either one but uses both to balance it out.. Just one of my "off the wall" test's.. Let us know how it goes... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484081 Share on other sites More sharing options...
SLEDOG Posted December 4, 2021 Author Share Posted December 4, 2021 Ok thanks Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484083 Share on other sites More sharing options...
Joey Mack Posted December 4, 2021 Share Posted December 4, 2021 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484086 Share on other sites More sharing options...
Onyx610 Posted December 4, 2021 Share Posted December 4, 2021 Sorry about those numbers I gave you, I was in the book the other day for some sensor ohm readings and for some reason that number kept coming to mind. Not sure why….Anyway let us know what you find out and we can go from there. Hopefully it’s just a bad sensor. 🤞🏻 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484088 Share on other sites More sharing options...
SLEDOG Posted December 5, 2021 Author Share Posted December 5, 2021 Ya it’s ok....828 ohms at 32deg F Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484134 Share on other sites More sharing options...
SLEDOG Posted December 5, 2021 Author Share Posted December 5, 2021 821 on other sensor Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484137 Share on other sites More sharing options...
Joey Mack Posted December 5, 2021 Share Posted December 5, 2021 have you checked fuse #40 in the dist. box on the firewall to see if it's loose or dirty. here is something else I have posted before... take a good 12v battery, and ground it to the truck with jumper cables and come off the positive with a small wire and power up #40 with a small probe or whatever you have that wont damage the fuse socket, and crank the truck... In a few cases, this showed me that the starter was pulling too many volts, away from the ECM.. this is generally for a 'no-start' condition... I hope my rocket did'nt go too far into outer space here? jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484140 Share on other sites More sharing options...
SLEDOG Posted December 5, 2021 Author Share Posted December 5, 2021 No rocket problems...lol....I’ll try it now Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484145 Share on other sites More sharing options...
SLEDOG Posted December 5, 2021 Author Share Posted December 5, 2021 Yah I don’t have a good connection on the main going to that block....let me work on that....thanks!!!! Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484147 Share on other sites More sharing options...
Joey Mack Posted December 5, 2021 Share Posted December 5, 2021 yes to checking the block grounds, battery, firewall ground breaker, ground posts behind the dash, left corner, and left of the fuse panel on the right.. the block ground goes to the frame behind the left steer tire. 15mm socket and wrench gets it off.. clean any heat shrink glue you see on the eyelets.. it can cause a weak ground by getting between each other... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484160 Share on other sites More sharing options...
Joey Mack Posted December 5, 2021 Share Posted December 5, 2021 one more idea, while you got the hood up, look at the wires coming out of the dist. box, and make sure they havent rubbed through on the edge of the square mounting bracket that it runs through or next to.. i have made that repair a fews times for a 'no-start' issue and such.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484161 Share on other sites More sharing options...
SLEDOG Posted December 5, 2021 Author Share Posted December 5, 2021 I see now that fuse 40 is drawing down to 10 volts when cranking I will find another battery and try what you said ... Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484162 Share on other sites More sharing options...
SLEDOG Posted December 5, 2021 Author Share Posted December 5, 2021 No wires rubbed thru 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484164 Share on other sites More sharing options...
Onyx610 Posted December 5, 2021 Share Posted December 5, 2021 This is gonna sound really odd, but how are the batteries? I’ve seen batteries do some weird 💩 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484184 Share on other sites More sharing options...
Joey Mack Posted December 5, 2021 Share Posted December 5, 2021 the small's can really ruin you're day... jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484185 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 1 hour ago, Joey Mack said: the small's can really ruin you're day... jojo This is so true, I’ve heard of modules being replaced and ended up being a bad fuse. Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484191 Share on other sites More sharing options...
Joey Mack Posted December 6, 2021 Share Posted December 6, 2021 (edited) heck I have even spent hours looking at an issue, only to find a bad fuse or dirty fuse socket... it happens... like I have said before.... 'not an expert, just joey mack'... Edited December 6, 2021 by Joey Mack Poor spelling Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484192 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 I haven’t had any problems with batteries all season ...they are two years old.... Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484194 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 18 minutes ago, Joey Mack said: heck I have even spent hours looking at an issue, only to find a bad fuse or dirty fuse socket... it happens... like I have said before.... 'not an expert, just joey mack'... Agreed, but as stupid as you feel when you find out it’s a fuse your very relieved haha. Check the simple stuff first stupid! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484196 Share on other sites More sharing options...
Onyx610 Posted December 6, 2021 Share Posted December 6, 2021 8 minutes ago, SLEDOG said: I haven’t had any problems with batteries all season ...they are two years old.... Ok…how about some more info on this problem? Are you getting fuel? Have you checked fuel pressure? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484197 Share on other sites More sharing options...
SLEDOG Posted December 6, 2021 Author Share Posted December 6, 2021 I have fuel at the rail but I don’t know what the pressure is. Quote Link to comment https://www.bigmacktrucks.com/topic/68870-460-aset-no-start/#findComment-484215 Share on other sites More sharing options...
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