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OJ Avery

Porch Pup
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Everything posted by OJ Avery

  1. turckster, on the ambient air temp, I started checking resistance from sensor to bulkhead connector at firewall. at pin 1 I have .6 ohm. on the other pin I get a reading of 5 ohm and another pin in the block of 46 ohms. that tells me I've got a wiring issue.
  2. turckster, the ground circuit has 18 ohm resistance
  3. ok thanks turckster, I understand possible injector issue with the regen often, even though it runs good, I have run into that before. what about the ambient air temp code? It goes active often. the sensor and updated pigtail have been replaced. I checked for continuity from the connector at the sensor all the way to the dash. I have continuity at the dash but its pretty high resistance, 114 k ohm. what am I missing with that? and the 2 wouldn't be related correct?
  4. I have a 12 granite with a mp7(us10 emissions). its been in a couple times now. Has had most of the emissions components replaced. the code that keeps reoccurring is an active code for ambient air temp sensor. the sensor and pigtail have been replaced. The sensor reads correct temp in ptt. The other problem that has been on going is that its calling for a regen often. the last completed regen shows about 50 hours ago. soot level is at 130% dpf, 7th inj, egr, dpf, boost pressure/temp sensor, pre/post nox sensor have been replaced, and the ecm reflashed.... Last time in I did a def piss test and it was good. January it was having the same regen often issue.
  5. the pressure, the volumes were good, it even had me testing def level sensor values. It guided me through a pretty thorough def system testing
  6. yes the volumes were good, diagnostics even took me to the return side, that volume was good as well
  7. ok thanks!! I haven't noticed and cracks but will be sure to look closely now
  8. regen took care of it?? cleared code, drove, all good Why?? I also had another mp7 come in with same code yesterday, immediately took it outside and did regen, code gone?? I don't understand why this is happening, anyone have an explanation??
  9. I have a 13 Granite with 10 emissions. active code spn 5246 after treatment scr operator inducement severity, fmi 0 data valid but above operating range. the ptt yesterday sent the tech to the scr test module, doser passed all 3 tests. then it said computer needs reprogramming. went to the dealer this morning, reprogrammed, no change at all except now it has the same code with a fmi 16, and that code is pending. every time we try to run the diagnostics it runs us to the scr test module where we find no problems. what are we missing here?? thanks
  10. We have an over heat solenoid on our mp7's, idk if it comes on all. We've seen a no start condition caused by this
  11. sounds like a charge air leak, did the dealer smoke test it? It should be pushing 39-42 psi
  12. So I did the snap throttle test a couple times. the first time I did it the engine was cold and it let out a good sized puff of white smoke, then nothing. Shut it off, sat for about a hour and did it again, no smoke at all. Then I ran it in the bay for about 30 minutes to get some heat into it. It got up to about 170 and I tried it again and there was nothing. I did a warm hold function test which we've found to be handy when suspecting injectors and that was good. I'm not sure where to look next.
  13. The soot ratio was reset at time of replacement. What would a NOX issue be? It was suggested to me late yesterday by a dealer mechanic to do a snap test. I was told I should see a small puff of black, then it should clear up. If not the issue is probably injector(s) over fueling, which makes sense if the dpf soot levels are climbing quicker than they should. Thanks for the info on the rolling regen though, that will be useful! Also I got the turbo to hit #42 of boost a few times which the only other times I've seen it that high was bad injectors OR new turbo w/ new injectors.
  14. Hi all. I have a 12 mp7 with US10 emissions that has some catalyst issues. Here's what's been done. New DPF, 7th injector ,doser, doser lines, doser pump, doser coolant lines, EGR valve , EGR venturi and EGR differential pressure lines and sensor. Here's the problem. After a few days it calls for a parked regen. Driver does it and then in 10 miles or so it asks for it again. What I have done, ACM learned data reset (I don't know if that was done when doser was replaced) and an After treatment Injector Adaptive Factor reset. (again I don't know if this was done when the 7th inj was replaced). It came into the shop today with no codes. soot level was at 4%. I put 140 miles on it today, half country roads , half highway. Soot level is now 40%. I had the ptt hooked to it and it never showed a rolling regen. 7th inj was never activated. My biggest question is does any one know at what point (soot level %) will a rolling regen happen and at what point (soot level %) does it call for a parked regen? And why would it call for a parked regen with a new dpf?
  15. You'll pull the tranny, support the engine, pull clutch/ flywheel /bellhousing. The Granites we have here that have a mp7 and a Mack 10 speed are supported in the rear by the bellhousing. The granites (06) that have an asset, the rear is supported on the trans
  16. with 37# of boost its not likely you have an intake leak. we have a lot of mp7's where I work and the 3 top probs are injectors, intakes and exhaust manifolds
  17. I had a mp7 no start. Supposedly started out as a hard start. Found a check ball in the primary fuel filter housing stuck open. I changed it and thought for sure it was solved. Didn't change a thing. After it sat for 5 minutes it would not restart. Changed the injectors and cups. Problem solved.
  18. I tried the mack extractor but its such a fine thread it pulled right through. I ended up using a ford spark plug removal tool. I adapted to make work. did a great job. I have never seen such a carboned cup!! #3 & #4 were unbeliveable
  19. busted off 3 tips of the injector cups...ugh!! I've never done that before. I've probably changed out 10-12 sets.
  20. I didn't have any low pressure codes, I don't think I have ever had one. I already checked/ blew out the cooler lines, I have found them packed full of crap before as well a few times but this one was clean. I believe each time they were using bio. I work for NYS DOT and we have a lot of Macks from 08 to 15 so I have seen a lot of the common stuff. This 08 has never had injectors which is a little odd. I just thought for sure I fixed it when I found the stuck check ball in the fuel filter housing. well I'm off to order my 6 pack and get this done, thanks for your input, I appreciate it. The bad camshaft you had, was it just worn? or broke? Our trucks don't have a lot of miles but they get a lot of hours so we do go through a lot of injectors.
  21. so let me give you a little more detail to see if you still believe injectors. I got it all together from replacing filter housing. started good, ran great down the road. turbo had 38# of boost, pulled hills good. Now what I have experienced in the past (I've only been working on these mp7's for 5 years ) is the turbo wont build any more than 30# of boost with bad injectors. If they are bad, why would it still pull this amount of boost??
  22. thanks fjh, I was reading the mp8 posts on no start / hard start and came to the same conclusion. I'll do an air in fuel test tomorrow to confirm. I really thought I had solved it tho finding the one check ball stuck open on the secondary filter,I guess that was a problem too. Thanks for the response!!
  23. Update... I changed the filter head, one of the check balls for the filter (primary ) was stuck open. I thought this solved it...nope, now its a hard start. I replaced the fuel pressure regulator on the return side of the head as well as the valve/ banjo fitting on the filter head on the return to tank line. still hard start. Ive run it hard outside and it runs great but 30 seconds after shut down it has to crank a long time to catch. Help please!!
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