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  1. MP9C

    Weird HVAC issue on single climate system

    Hey guys I am trying to wrap my head around this one an it’s not going well lol 2011 1500 5.7 Big Horn When the AC is on I everything works normal but when I change over to heat I loose the fan on the driver side ??? You could cook eggs on the passenger side and air flow is normal there but...
  2. MP9C

    In-depth look into p0300

    I still have not opened up my engine, after flashing my pcm with a 800 rpm parameter 95% of my issues went away. At this point I would say it’s a sticking lifter in my situation. Its possible you could have the same issue, I would suggest doing a wet compression test on 6 to see if your...
  3. MP9C

    In-depth look into p0300

    The truck still has the factory intake.
  4. MP9C

    In-depth look into p0300

    I have not changed it, might be something to look into.
  5. MP9C

    In-depth look into p0300

    Well in further testing, last night I cracked the PCM turned off the MDS and bumped the idle to what seems to be a reasonable rate to me 750 rpm and I went from 1500 misfires on a drive down to 50 misfires on the same drive. So that is interesting, I am going to do a longer drive and see what...
  6. MP9C

    In-depth look into p0300

    Priming fuel pressure 55 Running fuel pressure 64
  7. MP9C

    In-depth look into p0300

    Well I didn’t get into much today but I did go pick up a mopar oil filter and tossed it on and it is still missing but I would say it improved slightly since the oil pressure went a little higher with the new filter. I still need to torque the intake manifold as suggested before and I am...
  8. MP9C

    In-depth look into p0300

    I will have to look around and see if I have a manual gauge chilling anywhere. It’s not consuming any coolant I have not done the timing nor had it apart or know the history so…. There are some possible questions here.
  9. MP9C

    In-depth look into p0300

    I will give this a try, it can’t hurt
  10. MP9C

    In-depth look into p0300

    Well, You don’t have to pull the heads to change the MDS Solenoids. It doesn’t have an EGR valve. The crank position sensor has already been replaced. The compression numbers are posted and even the lowest one as well above Chrysler spec and within the 20% rule of the highest. If it had...
  11. MP9C

    In-depth look into p0300

    Possible I suppose but with compression being as high as it is I’m not 100% that would cause the miss but anything is possible. An it seems to go away with a rpm increase so I really am thinking it’s something to do with the lifters collapsing at lower rpm an not opening the valves all the way.
  12. MP9C

    In-depth look into p0300

    MisterB, This comment pertains to you.
  13. MP9C

    In-depth look into p0300

    I agree but I’m going to go on a limb and say most guys don’t have a oscilloscope chilling in there garage. I was just pointing him in a couple directions of things to check to find out if his issue is load related or position related.
  14. MP9C

    In-depth look into p0300

    Yeah Mister Luck, if it comes down to tearing it down I will be looking everything over, might even load all the springs to see the pressure rating on them to see if they all match up. An at that point lapping the valves at a minimum.
  15. MP9C

    In-depth look into p0300

    Umm that’s definitely different, I can roll right into mine and it’s balls out it don’t miss a beat. For you I would check your fuel pressure and check your throttle body and pedal position sensor one of those could have a dead spot in the potentiometer.
  16. MP9C

    In-depth look into p0300

    I will check all my Mode6 again and see if there are any direct faults that I overlooked before or if it’s showing all is normal MisterB, does yours do the same thing with cold vs warm and stop and go vs express way and stock idle vs 2 footing it to hold it up a little ?
  17. MP9C

    In-depth look into p0300

    I also agree everyone should bump the idle speed that increased idle speed everyone would gain more top end oil and that would help keep lifters pumped up. Burla, think about if if the lifters are bleeding off they are not staying pumped up that would essentially shorten the rocker ratio not...
  18. MP9C

    In-depth look into p0300

    So I think pulling the head and doing a set of lifters is probably in my future. My only other short term test option I could think of would be tossing on a programmer and bumping the pcm idle to 700-750 and see how it does. But that would be more of a bandaid on a repair that needs to be addressed.
  19. MP9C

    In-depth look into p0300

    Well it’s single digits outside and snowing so I didn’t get to test anything yesterday. But I went for a good 1.5 hr drive taking the dog to the vet. So I decided to 2 foot the whole way and holding the idle when stopping around 700rpm just above where it would idle on its own and it makes a...
  20. MP9C

    In-depth look into p0300

    It seems odd to me that the problem cylinders with these trucks just happen to be the MDS cylinders Bank 1 1&7 Bank 2 4&6 Odd or coincidence hummm ?
  21. MP9C

    In-depth look into p0300

    I have been thinking about how it runs to relative oil pressure but haven’t charted it yet. I rotated injectors twice to see if I could get any variance, hence removing them from the rail and moving the actual injector location. All wiring is still in factory condition. I have tested the...
  22. MP9C

    In-depth look into p0300

    Another odd thing I noticed was if you are stopped at an idle and it starts to miss bad, most of the time you can turn the truck off and start it right back up and it runs a lot better for a bit again but will go back to missing the next time ya stop.
  23. MP9C

    In-depth look into p0300

    I did run a bore scope down and the pistons and walls look good but I couldn’t really get a 180 view to see the actual chamber. I would think rings that worn would show on the compression test, something crazy ya know sub 100 psi
  24. MP9C

    In-depth look into p0300

    I know it’s 4,6 because I can see the livestream data in the pcm and watch the misfire counters.
  25. MP9C

    In-depth look into p0300

    VVT screens were clean and no flake at all in the oil. No real hemi tick either, tho I am wondering if the lifters are just starting to bleed off or developing an issue on those 2 cylinders. Or wiring is messed up somewhere. I am running pretty thin on ideas.

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