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I'm sure most of you have seen this video but this is a great help anyways:
This covers the how to fix a simple misfire due to just plain old age of the car, things getting dirty etc.
If you're getting a nasty misfire coming onto boost, this will be a good place to start^
I was having a misfire throughout my rpm range a few weeks after my rebuild, and I diagnosed by:
Starting the vehicle in neutral with e brake applied
Unplugging each coil pack individually (plugging back in each before checking the next) to determine if one coil pack was dead.
Sure enough, I found cylinder 4 to be faulty. It had no change in idle when I unplugged it, meaning no spark was present before or after. After a coil starts to misfire it is only a matter of time before the spark plug gets clogged with unburnt fuel and such, then doesn't work at all.
After swapping out a coil from my other RB26 and cleaning the plug up with a wire brush and electric cleaner, she fired right up, boosted nicely, then proceeded to melt all 6 pistons, but that's unrelated lol.
What other ways have you guys diagnosed poor/dead coils and how did you fix them? I believe most situations don't require you to completely replace your coil(s) when they could be just getting old and in need of a little TLC.
That being said, I know a lot of you swear by different aftermarket coil brands, and since I work at GM, I will be giving LS7 coil packs a shot once they get in.
This covers the how to fix a simple misfire due to just plain old age of the car, things getting dirty etc.
If you're getting a nasty misfire coming onto boost, this will be a good place to start^
I was having a misfire throughout my rpm range a few weeks after my rebuild, and I diagnosed by:
Starting the vehicle in neutral with e brake applied
Unplugging each coil pack individually (plugging back in each before checking the next) to determine if one coil pack was dead.
Sure enough, I found cylinder 4 to be faulty. It had no change in idle when I unplugged it, meaning no spark was present before or after. After a coil starts to misfire it is only a matter of time before the spark plug gets clogged with unburnt fuel and such, then doesn't work at all.
After swapping out a coil from my other RB26 and cleaning the plug up with a wire brush and electric cleaner, she fired right up, boosted nicely, then proceeded to melt all 6 pistons, but that's unrelated lol.
What other ways have you guys diagnosed poor/dead coils and how did you fix them? I believe most situations don't require you to completely replace your coil(s) when they could be just getting old and in need of a little TLC.
That being said, I know a lot of you swear by different aftermarket coil brands, and since I work at GM, I will be giving LS7 coil packs a shot once they get in.
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