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  1. Nap73

    Weird Trailer Brake issue 07 Yukon 2500

    What’s up guys ? Ok so I was fooling around with the trailer brake while the truck was parked & the Ignition was off. Instantly a check engine light came on. So I start the truck and check the code. Comes up as P1682. Anyone ever see this caused from the trailer brake ? Truck starts and runs...
  2. Nap73

    Persistent Misfire cylinder 3

    Just got home from My 2nd drive to NY today. All in All I drove 180 miles and was on the road 5 hrs. Not one code or pending code and I checked several times.It’s safe to say the harness was causing My misfire. The Chariot is running beautifully. All is good in the world. Sent from my...
  3. Nap73

    Persistent Misfire cylinder 3

    Of course Man. That’s what this is all about Helping each other. If any part of This helps the next guy out it’s worth it. I just wish the “search” of these forums yielded better results. Every time I have a situation I find myself having to start a whole new post because the search function...
  4. Nap73

    Persistent Misfire cylinder 3

    My gut feeling to be totally honest was to change it out in the beginning. Only reason I didn’t do it at first was I couldn’t find any info on how to do actually do it. I ended up just taking it apart & figuring it out Myself. Sent from my iPhone using Tapatalk
  5. Nap73

    Persistent Misfire cylinder 3

    Yea I know. You called it. Sent from my iPhone using Tapatalk
  6. Nap73

    Persistent Misfire cylinder 3

    Well I just got home from the 1st half of My trip today. All said and done it was a round trip 3 hour 90 mile drive. Only stopping to drop My Wife and Daughter off. The Truck was subjected to every driving condition possible. “”Sitting in stop & go traffic for 2 hours heading in. “”To...
  7. Nap73

    Persistent Misfire cylinder 3

    Yea it looked real good online I’m going to go ahead and get the AllDataDIY. I want to have something other than this message board & YouTube to rely on for repairs. That’s what I read they make a lot of the OEM electronics. The ignition coils are on Amazon for a great price. I’m just going...
  8. Nap73

    Persistent Misfire cylinder 3

    So do I Brother. There will always be a little something to do though. Thing is the more I do myself the more I learn. Parts are a lot cheaper than labor. Sent from my iPhone using Tapatalk
  9. Nap73

    Persistent Misfire cylinder 3

    Anyone use this service? http://alldatadiy.com/?gclid=CjwKCAiA27LvBRB0EiwAPc8XWX1Ndj_VJZIACSv246nux5Fho9BoDiZtUyX0S1bAogfOUgoJLpaaLBoCaUwQAvD_BwE Also what’s everyone think of Delphi parts ? Sent from my iPhone using Tapatalk
  10. Nap73

    Persistent Misfire cylinder 3

    Sent from my iPhone using Tapatalk
  11. Nap73

    Persistent Misfire cylinder 3

    Changed out the wire harness that connects to the coils. Was pretty simple/self explanatory. Just took a 40 min drive and no misfire/codes. I’ll be driving back and forth to Manhattan twice tomorrow about 180 miles in total. If I make it with no issue then that was the problem if not I’ll buy an...
  12. Nap73

    Persistent Misfire cylinder 3

    It’s used with the Candi module and connectors + the case. Sent from my iPhone using Tapatalk
  13. Nap73

    Persistent Misfire cylinder 3

    These are what I purchased ACDelco 357A GM Original Equipment Ignition Coil Wire https://www.amazon.com/dp/B001KSAQNM/ref=cm_sw_r_cp_api_i_dh76DbF5W3QDN Sent from my iPhone using Tapatalk
  14. Nap73

    Persistent Misfire cylinder 3

    Truck went from last Saturday to this Friday throwing zero codes. In that time it was driven many miles. On Friday my wife got the P0303 & P0353 codes again. I cleared the codes put some sea foam in the tank and continued driving code free. It’s worth it noting that those codes only seem to...
  15. Nap73

    Persistent Misfire cylinder 3

    Guy doesn’t know how to check what software it’s running. What do I tell him ? Thanks Sent from my iPhone using Tapatalk
  16. Nap73

    Tech 2 questions

    The tech 2 is a better option for me then. I have a MacBook. I’d have to buy a separate windows laptop or tablet. Sent from my iPhone using Tapatalk
  17. Nap73

    Persistent Misfire cylinder 3

    It’s a US based seller. He’s looking for $300 for it. More than likely buying it. Just want to make sure it’s running the correct software. Sent from my iPhone using Tapatalk
  18. Nap73

    Tech 2 questions

    It needs a windows laptop correct. Sent from my iPhone using Tapatalk
  19. Nap73

    Tech 2 questions

    What’s the downside to this as opposed to the tech2 ? What can’t it do that the tech2 can? Sent from my iPhone using Tapatalk
  20. Nap73

    Persistent Misfire cylinder 3

    I’ve got my eye on a Tech2. What do I need to look for? Sent from my iPhone using Tapatalk
  21. Nap73

    Persistent Misfire cylinder 3

    1-Mechanic swapped coils not injectors and the issue stayed with # 3. 2-We also inspected / manipulated the wiring to see if the misfire could be triggered that way. But nothing. I’m almost to the point that I change the wiring out anyway. It’s cheap and easy. Only thing stopping me is the...
  22. Nap73

    Persistent Misfire cylinder 3

    Ok so I ran 3 bottles of the Techron fuel system cleaner thru the truck one after another. 1st bottle in a tank less than 1/4 full. 2nd bottle on an almost empty tank that I then filled with 10 gallons of gas 3rd bottle on an almost empty tank that I filled with 10 gallons of gas After...
  23. Nap73

    Persistent Misfire cylinder 3

    Got your reasoning. So if it was an injector issue there would be a specific code ? Also I found a ECM for $220 on Amazon. How involved is this to instal ? I’m assuming a dealer needs to program or flash it for your specific vehicle. The explanation and info is appreciated. Sent from my...
  24. Nap73

    Persistent Misfire cylinder 3

    Miss read your post Man He swapped coils not injectors. Coils are an easy swap the injectors now that’s a different story. If I’m going that far I’ll just replace them all then. Sent from my iPhone using Tapatalk
  25. Nap73

    Persistent Misfire cylinder 3

    Everything looks fine with the scan tool. Before the ignition coil swap & after. And the misfire isn’t happening all the time. I ran a couple of 20oz bottles of Techron complete fuel system cleaner and took the truck on some longer rides. And it seems to be helping the situation as no codes or...

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