2011 ram 1500 misfire

Thank for all the help on this site. Im trying to learn everything I can with you alls help

chris.arriazola wrote: Thank for all the help on this site. Im trying to learn everything I can with you alls help

Same here! That's what makes this place such a great resource for the people with the ambition to learn.

Yeah, this Ram was kinda a basket case! :lol: Definitely not one that's gonna get fully covered in the standard one hour diag. The coil deactivation... I really don't have an answer for that one, either. :blink: Does this engine have the cylinder deactivation system? Maybe the coil strategy has something to do with that.

Perhaps there's enough valve overlap on this engine to allow the cylinder to suck air our of the exhaust, thus creating static compression? It's a stretch, I know, just thinking out loud.

Tyler wrote: Yeah, this Ram was kinda a basket case! :lol: Definitely not one that's gonna get fully covered in the standard one hour diag. The coil deactivation... I really don't have an answer for that one, either. :blink: Does this engine have the cylinder deactivation system? Maybe the coil strategy has something to do with that.

Perhaps there's enough valve overlap on this engine to allow the cylinder to suck air our of the exhaust, thus creating static compression? It's a stretch, I know, just thinking out loud.

Valve overlap sounds like a more realistic scenario than my theory.

I also like your thinking with the possibility of cylinder deactivation.

Wow, that thing really ate up that lobe! That cam is a keeper for sure!

As a general rule of thumb with these 5.7s if you don't see a code then don't worry much about the control/load side of the injectors/coils. That's one of the reasons why I love working on these 5.7s so much. They are so closely monitored and give you access to tons of data for both the engine and transmission. The power feed to the coils and injectors is through the ASD circuit of the TIPM. It's monitored by both the TIPM and ECU. If there's a problem there you will have codes. You can also watch live data. There will be an ASD Circuit Sense PID. It should stay High until after the vehicle is shut off where it'll go Low.

The coils are two wire coils so not only does the ECU have full control over them but it'll also be able to see the waveform of the voltage spike induced in the primary side. So it knows when the coils are firing. If you want to check your ignition system you can do it sitting on your butt looking at a scanner screen. Not only can you see dwell time (duration of time each coil is energized) but you can also see actual burn time (duration of time spark is jumping the gap) for every coil! Again, I love how much access these 5.7s give you!

I know you're already past the point now but if you're ever in this situation again then just go into live data. If ever you see a zero dwell time on one coil without a code then it's being done intentionally. The part that you need to look for is a coil that has the same dwell as all the rest yet a burn time that drops very low. A couple times I've seen a failing coil on one of these 5.7s that wasn't bad enough yet to flag a code yet I could clearly see on the live data that it would have partial fires.

ecwurban wrote: Wow, that thing really ate up that lobe! That cam is a keeper for sure!

As a general rule of thumb with these 5.7s if you don't see a code then don't worry much about the control/load side of the injectors/coils. That's one of the reasons why I love working on these 5.7s so much. They are so closely monitored and give you access to tons of data for both the engine and transmission. The power feed to the coils and injectors is through the ASD circuit of the TIPM. It's monitored by both the TIPM and ECU. If there's a problem there you will have codes. You can also watch live data. There will be an ASD Circuit Sense PID. It should stay High until after the vehicle is shut off where it'll go Low.

The coils are two wire coils so not only does the ECU have full control over them but it'll also be able to see the waveform of the voltage spike induced in the primary side. So it knows when the coils are firing. If you want to check your ignition system you can do it sitting on your butt looking at a scanner screen. Not only can you see dwell time (duration of time each coil is energized) but you can also see actual burn time (duration of time spark is jumping the gap) for every coil! Again, I love how much access these 5.7s give you!

I know you're already past the point now but if you're ever in this situation again then just go into live data. If ever you see a zero dwell time on one coil without a code then it's being done intentionally. The part that you need to look for is a coil that has the same dwell as all the rest yet a burn time that drops very low. A couple times I've seen a failing coil on one of these 5.7s that wasn't bad enough yet to flag a code yet I could clearly see on the live data that it would have partial fires.

Good tip with the dwell pid!