tylerrmack

Yeah i figure it would through codes if bad enough. I have had misfire code previously chalked up to faulty spark plug. Dont know if that was just BS. I figure these things have certain parameters that dont throw codes as long as its able to adjust. Just like it wont throw a misfire code unless its really bad multiple misfires. My question is that if its normal or is the system having to constantly adjust/compensate to stay just below the code throwing threshold?

2016 1500 6.2l. Having a intermittent rough idle stumble and even stumbles with increase to 1000k RPM. Its slight but noticeable. I have a cheap OBD2 bluetooth and Torque app for reading. I don't know how accurate it is, but figure all its doing is sending numbers, so should be find. With my truck idling fuel pressure is sporadic around 45psi with dips to 30 and even 22 psi, then sometimes up to 50psi. This seemed to be at about the same frequency as my stumble. The other reading if Fuel rail pressure which is much higher and cycles high and low but not as drastically. Is this normal? I tried attaching a screen shot. The numbers on the left are wrong but the graph shows the fluctuation. If someone knows the right reading to be expected or have a sensor to check their truck and see what the reading are, I would appreciate it.

I have noticed vibrations throughout my highway drives. Any on brand new smooth pavement my water is always jostling. Looking through forumns I dont know what to think. Everyone has a different fix. Anyway im lookig into the suggestion for fix here. 2016 denali 6.2l shortbox. I figured the mag ride was going to be super smooth but its definetly not what i expected or something is wrong. Looked under my truck. No spring spacers like on other forums (why do some have these and others not?, is it different grades of suspension or did they come leveled?). Also i have marks on my rear axle and drive shaft. Do you think the factory did this or was there some sort of out of factory repair on it that i wasnt told about?

I know this is 6 months old. But has anyone got a fix. I actually have a 6.2l sierra denali. Idle rough but engine mounts absorb most of it, except every 3 seconds or so it seems to stumble and I can feel it in the cabin. Then one morning p0300 engine misfire. Dealer said just bad luck with bad spark plug. Replaced it, but stumble every few seconds still ther. Very slight but annoying. Would be better if constant.