10-25-2023,
(10-24-2023 )Bengy88 Wrote: [ -> ]I just pm’d you my number. I can send you a schematic and if you want I’ll remote in and monitor a few things and give my opinion if you want
Yes that would be great. Thank you!
(10-24-2023 )Bengy88 Wrote: [ -> ]I just pm’d you my number. I can send you a schematic and if you want I’ll remote in and monitor a few things and give my opinion if you want
(10-24-2023 )Rawze Wrote: [ -> ]cranking up and then stumbling out sounds more like a fuel issue to me... but one never knows when they are just guessing at it on a forum...
fuel pump acting up or going out?. - Has anyone bothered to pull the fuel pump head off and inspected the plungers, rollers, cam, etc?.
Performed a plunger test to ensure they are not sinking ... and Also pulled them put and flipped them upside down to see if they go into the holes upside down, to ensure they are not not flared out slightly at the tops, causing sticking when operating?.
(10-25-2023 )shawn21998 Wrote: [ -> ](10-24-2023 )Rawze Wrote: [ -> ]cranking up and then stumbling out sounds more like a fuel issue to me... but one never knows when they are just guessing at it on a forum...
fuel pump acting up or going out?. - Has anyone bothered to pull the fuel pump head off and inspected the plungers, rollers, cam, etc?.
Performed a plunger test to ensure they are not sinking ... and Also pulled them put and flipped them upside down to see if they go into the holes upside down, to ensure they are not not flared out slightly at the tops, causing sticking when operating?.
Initially I was thinking fuel issue but the batteries were at 8v so I installed new batteries and still got low voltage code as only active code. Someone replaced the solenoid on the back of the pump so I checked wiring from that to ECM and insured resistance is within specifications. I am open to ideas but not sure how to perform plunger test. The way the truck fires right up initially is what lead me to believe its a voltage issue at ECM. Truck acts like you just turn the key off after it fires up. Is there any fuel pressures I should monitor before pulling the head off the pump?
(10-27-2023 )shawn21998 Wrote: [ -> ]UPDATE:Not sure if anyone cares but I thought I'd give an update. After testing and inspecting I have found the fuel shutoff solenoid is only getting 9v at connector, when measured with good ground voltage is 12v. Removed ECM engine harness connector and insured wiring is under 1 ohm for connector. Seems like ECM has short on ground circuit and is causing voltage drop. Im trying a test ECM and will update accordingly. Thank everyone for your suggestions.
(10-27-2023 )Rawze Wrote: [ -> ](10-27-2023 )shawn21998 Wrote: [ -> ]UPDATE:Not sure if anyone cares but I thought I'd give an update. After testing and inspecting I have found the fuel shutoff solenoid is only getting 9v at connector, when measured with good ground voltage is 12v. Removed ECM engine harness connector and insured wiring is under 1 ohm for connector. Seems like ECM has short on ground circuit and is causing voltage drop. Im trying a test ECM and will update accordingly. Thank everyone for your suggestions.
My fuel shutoff solenoid on my CM871 went bad years ago. I removed its guts to get the engine running again, and off the side of the roads.. and have not bothered to fix it for about 300,000 miles now...lol. - Engine starts and stops just fine without it.
(11-16-2023 )shawn21998 Wrote: [ -> ]...
I got the new ECM and unfortunately the truck still has the same issue. Still trying to figure it out... The only active code is SPN 168 FMI 1 SAE- Battery potential (Voltage) Data valid but below normal operational range - Most severe level. From component #128. I can't find any info on that code or what component 128 is.
(11-16-2023 )Rawze Wrote: [ -> ](11-16-2023 )shawn21998 Wrote: [ -> ]...
I got the new ECM and unfortunately the truck still has the same issue. Still trying to figure it out... The only active code is SPN 168 FMI 1 SAE- Battery potential (Voltage) Data valid but below normal operational range - Most severe level. From component #128. I can't find any info on that code or what component 128 is.
What is the fuel pressure and oil showing while cranking?... and after, as it dies?.
What is the ecm voltage while cranking?>,.. and after, when it dies?.
Also, what does the Insite software show for active and inactive faults instead of some after-garbage SPN-type code reader?.