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OJ Avery

Porch Pup
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Posts posted by OJ Avery


  1. Thanks JoeH, I believe we have the correct rod here in the shop and I've googled techniques, so I'll take a swing at it later today. I was hoping it has been an issue for others and there was a solution to the problem. this isn't the first one I've encountered

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  2. Anyone run into this?? This is a abs sensor mount for a rear axle. Truck is an 11 gu713.  It rotted off from salt exposure. Is there a repair kit? or do I just go talk to the guy who has done "some" cast welding

    abs mount.jpg

    abs mount 1.jpg

    abs mount 3.jpg

    abs mount 4 .jpg


  3. Turckster, I have watched techs here do the same thing. They've done one set and don't think they need to look at procedures any more. I just did a set that was 18 months old, maybe 15,000 miles. Had air in fuel bad and leak down/no start over night.


  4. Hey! I was wondering how common a problem is injector leak down causing no start over night on a MP7? I've had it happen 2 times now and the first time I understand. It had OE injectors, ran really good n o codes. Cylinder balance was off a good amount (I don't recall how much) .  I replaced the fuel filter head....which did have a sticking check valve. Same problem.  We replace a lot of injectors here because of how the equipment is used. So I did the injectors in that one, problem solved. This one I just did is a MP7 also. It had injectors 18 months ago (conical). No start  overnight, have to prime it to start it. Cylinder balance was off especially for recent injectors. The difference on the cylinder balance between 5 & 6 was 50. It also showed air in fuel. We went over all fuel lines and connections and all looked good. I finished the injectors and ran it. Shut it off at 2 yesterday and it fired no problem just now.


  5. I have run into this twice recently and both times it was a bad injector. One is sticking open I believe therefore leaking down quickly. Both of the trucks I did, both ran great no drivability issues and no air bubbles indicating cups. There were no injector codes . Cylinder balance test will show it being off some but not really enough to condemn it on that alone.


  6. I have an odd one. 14 gu712 w/mp7. I'm the 3rd person to work on this so here's the story. Code for def quality. Derate for def quality on the lcd. Sensor was replaced, new def added. Same problem. Not sure what was done by 2nd person. I get it this  morning , no codes, derate for def quality on lcd. Cleared lcd warning with the guard dog. Drove for 20 minutes no problems. parked in my bay, off for about 10 minutes. Turn ignition on , lightning bolt and check engine light and def quality derate on lcd all on. after about 5 seconds lightning bolt goes off, a couple seconds later the check engine light goes off. Again I clear the derate message with the guard dog. No codes. I can't find a learned data reset or an acm reset anywhere in ptt. What is going on with this thing? Thanks


  7. ok, so I measured resistance , pin 4 to pin 27a... .5 ohm. Then pin 86 to 22b... 5.0 ohm. I wiggled the harness no changes. So then with everything connected , ignition on I pressed and held the switch and wiggled the connection at the dash panel and the light came on. So I have it positioned where it'll come on every time (so far ) but what would you recommend. I had my suspicions early on that the dash panel itself was bad. But I don't know what to do now. Should I order a dash unit? If I order a dash panel will it need to be programmed at the dealer?


  8. turckster, I concluded that the instrument panel controls the ground circuit. But you cannot just ground that circuit, you'll pop the fuse. ZDB I felt I should have a lit switch with out the mirrors plugged in. Here is what I have.

    At the switch I have power at terminal 2 with the ign on.

    When you push the switch I have power at term 4 on the switch, and that power goes to term 27a on the instrument panel.

    With ign off I have power at pins 85 and 30 at the mirror heater relay. With the relay plugged in I have power at pin 86 at the relay which sends power to pin 22b at the instrument panel.

    I have continuity from pin 12 on the switch to the positive at the mirror. The Ground at the mirror is good.

    ALSO.... I took the dash, the relay and the switch and installed them all separately in another 2013 gu and every time the heated mirrors worked.

    I'm so lost on this

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