ryans3140
Junior Member
Hi All,
I bought a 5th gen 2023 ram w/ the 5.7 Etorque earlier this year. The truck (only 10k miles) was in the shop for 38 days due to a P0306 & P0300 code. Dealership couldn't figure out problem.
Dealership contacted Ram Engineers and opened a star report. The dealership was very kind to provide a rental car (Chrysler voyager minivan). In case you're wondering, yes, I did get made fun of.
After 38 days, the dealership had contacted me that they had unplugged and replugged some connections as well as used fuel injector cleaner and the misfire disappeared. Certainly don't feel great about it but the misfire has been gone and put roughly 5k miles on the truck since then.
The reason for this post is to relay what the engineers recommended in case anyone else has a similar problem.
Star Report:
1. Fuel Pressure test, Fuel Pressure leakdown, Fuel sample (check for contamination), perform compression test and leakdown test.
a. everything passed Right bank (2,4,6,8, cylinders around 120-135; Left bank 1,3,5 @ 127 and 7 @ 136. Fuel pressure was 59 PSI.
2. Check MDS Solenoid connectors for damage, corrosion, bent terminals, or any irregularities. Also, check the engine & intake manifolds for any vacuum leaks.
a. all passed
3. Perform Block pressure test overnight to inspect for irregularities. Also, inspect spark plugs for any fouling, carbonation, and irregularities. Also, check cylinder 6 using borescope for scoring or other degradation.
a. all passed, no sign of coolant with borescope, checked pressure gauge and the gauge stayed at 15 psi over the weekend.
4. Monitor fuel injector pulse width and see which one is off, one will be at least 15% higher or lower than others. The issue may not be at idle, so recording different rpm ranges is helpful. Once you determine which cyclinder is the issue, measure resistance of injectors and compare. Try swapping that injector to another cylinder, reset fuel trims and reevaluate to see if you have a plugged or leaky injector.
a. misfire is still happening on cylinder 6, cylinder 6 & 8 a little off from the rest. Put in fuel injector cleaner and let the vehicle run for a while. Test drove vehicle and misfire didn't return. Vehicle operating as normal.
-------------------------------
Hopefully this was helpful for anyone with a similar issue and is out of warranty.
Thanks!
Ryan
I bought a 5th gen 2023 ram w/ the 5.7 Etorque earlier this year. The truck (only 10k miles) was in the shop for 38 days due to a P0306 & P0300 code. Dealership couldn't figure out problem.
Dealership contacted Ram Engineers and opened a star report. The dealership was very kind to provide a rental car (Chrysler voyager minivan). In case you're wondering, yes, I did get made fun of.
After 38 days, the dealership had contacted me that they had unplugged and replugged some connections as well as used fuel injector cleaner and the misfire disappeared. Certainly don't feel great about it but the misfire has been gone and put roughly 5k miles on the truck since then.
The reason for this post is to relay what the engineers recommended in case anyone else has a similar problem.
Star Report:
1. Fuel Pressure test, Fuel Pressure leakdown, Fuel sample (check for contamination), perform compression test and leakdown test.
a. everything passed Right bank (2,4,6,8, cylinders around 120-135; Left bank 1,3,5 @ 127 and 7 @ 136. Fuel pressure was 59 PSI.
2. Check MDS Solenoid connectors for damage, corrosion, bent terminals, or any irregularities. Also, check the engine & intake manifolds for any vacuum leaks.
a. all passed
3. Perform Block pressure test overnight to inspect for irregularities. Also, inspect spark plugs for any fouling, carbonation, and irregularities. Also, check cylinder 6 using borescope for scoring or other degradation.
a. all passed, no sign of coolant with borescope, checked pressure gauge and the gauge stayed at 15 psi over the weekend.
4. Monitor fuel injector pulse width and see which one is off, one will be at least 15% higher or lower than others. The issue may not be at idle, so recording different rpm ranges is helpful. Once you determine which cyclinder is the issue, measure resistance of injectors and compare. Try swapping that injector to another cylinder, reset fuel trims and reevaluate to see if you have a plugged or leaky injector.
a. misfire is still happening on cylinder 6, cylinder 6 & 8 a little off from the rest. Put in fuel injector cleaner and let the vehicle run for a while. Test drove vehicle and misfire didn't return. Vehicle operating as normal.
-------------------------------
Hopefully this was helpful for anyone with a similar issue and is out of warranty.
Thanks!
Ryan
