SLEDOG Posted October 27, 2022 Share Posted October 27, 2022 I have a 2007 Mack Granite with the AI-460 motor. It started to develop a slight miss so I changed both fuel filters. Didn’t notice much difference. now the motor will cut out completely for a second and come right back usually a couple times a day. It never seems to happen under heavy load and seems to pull fine on the hills. Any help is greatly appreciated. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/ Share on other sites More sharing options...
Onyx610 Posted October 27, 2022 Share Posted October 27, 2022 Fuel restriction? Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513669 Share on other sites More sharing options...
Solution Joey Mack Posted October 27, 2022 Solution Share Posted October 27, 2022 Grounds.... ACC. Relay... fuseable link at the batt. box.... Electric instant shut down or slow death...? does it start right back up?? Codes???? 9-2 for example...... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513687 Share on other sites More sharing options...
SLEDOG Posted October 27, 2022 Author Share Posted October 27, 2022 JoJo- No codes…shuts down for second only…it does it in cruise as well…. grounds should be good but I’ll double check. I haven’t checked acc relay… sledog Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513704 Share on other sites More sharing options...
SLEDOG Posted October 27, 2022 Author Share Posted October 27, 2022 Onyx- i can’t rule out fuel restriction…. probably need to get a gauge and long hose so I can tap fuel pump and rig it up in the windshield right? sledog 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513706 Share on other sites More sharing options...
Onyx610 Posted October 27, 2022 Share Posted October 27, 2022 That would be a good start and monitor fuel pressure while driving and when the issue occurs. Joey will be better on this then me so I’ll just stand back and watch. I don’t want too many ideas thrown at you. Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513714 Share on other sites More sharing options...
Joey Mack Posted October 27, 2022 Share Posted October 27, 2022 fuel pressure can cause a cutout, but I would expect a weakening or a slow death,, I think he said it picks back up.... so,, you may very well be right.. definately check fuel pressure during the test runs... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513719 Share on other sites More sharing options...
Onyx610 Posted October 27, 2022 Share Posted October 27, 2022 Id say check that but def listen to Joey. He’s got you, if I see anything along the way that sticks out I’ll holler! Haha Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513724 Share on other sites More sharing options...
SLEDOG Posted October 27, 2022 Author Share Posted October 27, 2022 Ok what pressure should I see? Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513737 Share on other sites More sharing options...
Joey Mack Posted October 27, 2022 Share Posted October 27, 2022 60-80 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513738 Share on other sites More sharing options...
Onyx610 Posted October 27, 2022 Share Posted October 27, 2022 (edited) Isn’t this the truck you had a hard time getting started about 9 months ago or so? Edited October 27, 2022 by Onyx610 Spelling Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513739 Share on other sites More sharing options...
SLEDOG Posted October 27, 2022 Author Share Posted October 27, 2022 Yes it is onyx Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513740 Share on other sites More sharing options...
Onyx610 Posted October 27, 2022 Share Posted October 27, 2022 I’ll have to go back and read to what all we talked about and see if anything could possibly correlate to the issues your having now. Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513742 Share on other sites More sharing options...
Onyx610 Posted October 27, 2022 Share Posted October 27, 2022 I believe you checked fuel pressure then Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513743 Share on other sites More sharing options...
Onyx610 Posted October 27, 2022 Share Posted October 27, 2022 @Joey Mackany possibility of engine position or speed sensor? Monday I’ll check the aset book for this symptom. I’ll post pics of any pages I find any value for you. Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513746 Share on other sites More sharing options...
SLEDOG Posted October 27, 2022 Author Share Posted October 27, 2022 I never get a guage and actually check pressure Onyx Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513757 Share on other sites More sharing options...
Joey Mack Posted October 27, 2022 Share Posted October 27, 2022 the sensor test can be done buy wiggling the wires while its running to see if it cuts out.. you can also unplug one at a time to see if it cuts out.. un plug one, if it stays running, plug it back in, then go to the other one and do the same.. Yes it will throw codes.. but at leaste you know what they are.. you can check codes before you do this test just to see whats logged.. Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513758 Share on other sites More sharing options...
SLEDOG Posted October 28, 2022 Author Share Posted October 28, 2022 Joey Not sure I totally understand sensor test. Are you saying it should stay running when I unplug one at a time? And if it does they are both good? sledog Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513775 Share on other sites More sharing options...
Joey Mack Posted October 28, 2022 Share Posted October 28, 2022 (edited) yes it will run on one or the other... if you unplug one and it shuts off... the other one is bad...... 2 sensors.. one on the right front for the cam, and one on the left at around 10 o'clock on the flywheel housing.. Edited October 29, 2022 by Joey Mack wrong info 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513776 Share on other sites More sharing options...
SLEDOG Posted October 28, 2022 Author Share Posted October 28, 2022 Joey Ok thanks I’ll try that tomorrow morning. sledog 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513778 Share on other sites More sharing options...
SLEDOG Posted October 28, 2022 Author Share Posted October 28, 2022 Joey yah motor shut off when I disconnected cam sensor. looking to get a new one for bell housing now thanks a million!! sledog Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513821 Share on other sites More sharing options...
Joey Mack Posted October 28, 2022 Share Posted October 28, 2022 Good deal... Easy free way to test them... You will have stored codes for the sensors.. make sure the wires on the truck side of the crank sensor are in good shape.. follow the wire about a foot or so from the plug.. they rot and break, and that may be the whole problem anyway... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513825 Share on other sites More sharing options...
Onyx610 Posted October 28, 2022 Share Posted October 28, 2022 2 minutes ago, Joey Mack said: Good deal... Easy free way to test them... You will have stored codes for the sensors.. make sure the wires on the truck side of the crank sensor are in good shape.. follow the wire about a foot or so from the plug.. they rot and break, and that may be the whole problem anyway... jojo Agreed, that’s what I was thinking when I mentioned the sensors. Maybe a break in one of the wires and maybe a bump in the road quick move it enough to cut out briefly? Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513827 Share on other sites More sharing options...
Joey Mack Posted October 28, 2022 Share Posted October 28, 2022 I'm out of likes already.. this one's for you Onyx....😘 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513829 Share on other sites More sharing options...
Onyx610 Posted October 28, 2022 Share Posted October 28, 2022 😊 Quote Link to comment https://www.bigmacktrucks.com/topic/70625-ai-460-cutting-out/#findComment-513830 Share on other sites More sharing options...
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