Results 1 to 10 of 57

Thread: Massive misfire cylinder 1 -- SOLVED (wire corrosion)

Threaded View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Senior Member Rkt Ship's Avatar
    Join Date
    Jan 2014
    Location
    Mansfield, Oh
    Country
    United States
    Posts
    384
    Thanks
    22
    Thanked 188 Times in 79 Posts

    Massive misfire cylinder 1 -- SOLVED (wire corrosion)

    I ran into an issue last night. I was on cruise control going down 71 and I started getting a massive misfire. It felt like I lost a cylinder. I immediately pulled over and had the car towed home. I was flying blind as my Bluetooth obd reader was in my wife's truck so I started checking things that could cause misfire. I pulled spark plugs. They looked pretty beat so figured why not replace. No fix. I took the spare could that were known good at one time and swapped them in. No dice. I then moved to injectors. Once I swapped out the newer injectors from when I bought the engine. Everything seemed fine. Then this morning I went to leave it felt ok then about a mile from my house I lost power and lost a cylinder again. Check the one reader and I have misfire cylinder 1. Now I checked the Injector resistance and they were at about 12.5 ohms across the board. I then checked the wires to see of there was any voltage drop. I found 12v on one side and 2.5v on the other across the board. I think with the key on it's "priming" the injectors which is why there's 2.5 on one side. If you pull a connector and check codes you'll get a pending injector low voltage code. If you plug it back in it goes away. After coming up what seems to be good there I moved to the scary stuff. Draining the oil to look for bearing material. I had no bearing material in the oil nor any metal shavings stuck to my drain plug magnet. Just to play it safe I ran the oil through a paper towel to try and find some material. No material. I also ran a magnet through and cut open the oil filter to check for stuff and nothing. Now I'm confused as to where to go from here. I guess I could pull the valve cover and see if there are any valves stick open. That's a pretty quick check. Other than that I'm lost. Any advice would be great. Thanks in advance.



    Quote Originally Posted by Rkt Ship View Post
    Now onto the real problem. It was corroded wiring. Like really corroded. The wire had chaffed in the tab that holds the injector harness to the intake manifold.
    Quote Originally Posted by Rkt Ship View Post
    Another wire that had rubbed through on the plastic connector that mounts the harness to the manifold. This one had rubbed through completely when I opened up the harness it was in 2 pieces.
    Last edited by Eggman; 07-19-2021 at 07:47 PM. Reason: Added solution

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •