Hey Y'all. Got this Ram that misfires, occasionally stalls, and sets P0205. Initially had replaced the injector which hadn't fixed it. You need to drive it for about 10 minutes for it to start acting up. The stalling wasn't noticed until later and at lower speeds like coming to a stop or going through a parking lot. Had scoped the both the volts and amps and didn't notice anything wrong. This was at idle and comparing to another cylinder. Setup the scope to watch volts and amps while driving and didn't make it out of the lot before running bad and stalling. Ran fine at idle. Didn't fail until I accelerated a little and backed off to coast through the lot. Watching the patterns, the injector appears to be turned on at random and sometimes for a considerable amount of time. Doesn't look like a wire grounding as there isn't more random noise in the volt trace. Doesn't look to be an open wire as when the volts go low, the amps go high. So, like the title says, I think I've got a bad driver and would like for you to either confirm this or give other testing ideas. Currently planning on sending the PCM to be tested but waiting on what I get here. Screenshots and scope file to follow for those of you that use a Snap-On scope. Thank you for your time.

Yellow trace is volts. Green is amps.

Here's the file. [Injector pattern. Possible failure of driver.]

Here's a close up of the pattern when running fine. [Normal injector volt and amp pattern]

Here's a zoom out of a normal pattern. [Normal pattern and spacing]

And here's when it all goes wrong. Same zoom as previous. [Pattern during failure]

Erik Laudenslager
Technician
Advanced Auto Systems
Tualatin, Oregon, USA

Files Referenced: