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  1. Z

    Random Misfire

    So the misfire was gone all weekend back came back on my way home from work this morning. I decided to see how it would run with O2 sensors unplugged knowing all it would do is throw a code and the ECM would run in open loop. I drove it around for about 30-45 and there was no misfire. The fuel...
  2. Z

    Random Misfire

    I replaced a little over two years ago and and have put 60,000+ miles on them sense. But the voltage seems to be with the correct range. Is it possible for them to be bad and still give off the correct voltage? Oddly enough, today I haven't had a single misfire and I've driven quite a bit...
  3. Z

    Random Misfire

    I read posts from a few other people that have the same fuel pressure at idle and don't have an issue. But I guess that still could be an issue. If I remember correctly, the fuel pressure should be between 55-60 psi. Which it is at higher speed.
  4. Z

    Random Misfire

    Well, I checked the fuel pressure today. It's at about 47 psi at idle, at cruising speed it around 52-55 psi, and on hard acceleration it's about 60 psi. So fuel pressure doesn't seem to be an issue. I'm still getting a misfire while cruising but not during acceleration, normal or hard...
  5. Z

    Random Misfire

    I changed the crankshaft position sensor again to see what it would do. It got somewhat better but still far from great. So I an some diagnostic checks today to see if I could find an issue. From research I've done in the past, it looks like the fuel trim is out of limits at idle but gets better...
  6. Z

    Random Misfire

    The computer threw a code for a long time for a random misfire but it never really seemed to have a misfire until about a month or so ago. I thought it may of been a fueling issue but the fuel pressure checked out okay (I haven't checked it recently so its still a possibility). Then I did a tune...
  7. Z

    Random Misfire

    I know this is a common issue people have. I've done quite a bit of research but I can't seem to figure it out. I've got a 1998 Chevy K1500 with a 5.7 Vortec tuned by Blackbear Performance. I've had a misfire issue for quite a while now. I finally thought a had it figured out last weekend when I...
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