Thread: muliptle misfire code when boosting

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  1. #1 Re: muliptle misfire code when boosting 
    Turbo is the way to go. BillBoost37's Avatar
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    Have a borescope handy?

    Hearing that the previous owner ran 89 octane, I'm thinking it's time to ask him how many plugs were mangled when he replaced them. I'm thinking the low octane with boost may have chipped some pistons. However before we condemn the pistons and scare you to hell, let's talk further.

    Do the coils on the car look original or are they red MSD coils? MSD coils are known to cause issues at higher rpm, stock are better.

    What kind of plugs did you use? Platinum are never suggested in our cars, iridium or copper are the way to go.

    Do you have a scanner capable of telling you which cylinders are misfiring when you drive it? If it was a shared coil (3/6, 1/4, 2/5) then you could replace just that coil.

    That's where i'd start.
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  2. #2 Re: muliptle misfire code when boosting 
    SE Level Member johannib's Avatar
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    No borescope, would have to rent or borrow one.

    Coil packs are original, still have the cylinder #'s written on them. I put in AC/Delco iridium plugs, same as the ones I removed. I do not have a scanner that can tell me which cylinder.

    I used a MAC scanner from a friend (no recent software updates) and also had Advance Auto run a scan. They both only gave me the 3000 code for muliple random misfire. I'm hopin for the best but expecting the worst.

    The other thing I'm bothered with is why on earth he ran the car with the BBV electrical connector unhooked and never noticed anything? The plugs I removed showed no signs of physical damage form debris but then they probably wouldn't.

    If it is a coil pack will it show up when I test it with an HEI tester. Have one ordered and will be a few days before it gets here. No auto parts stores carries one around here, ughh!
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