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4.8 LS Breaking up under boost only!

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Old Oct 1, 2021 | 02:28 PM
  #11  
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Originally Posted by dantheman1540
99.9% sure they were TR7XI #3690 truck didn't make that much power cause TVS1900 turned way up on a stock engine is not that efficient but it never had spark issues on 93oct. When the belt didn't slip it would see 18psi on a cool day.

I also had no issues with TR6s at that boost level and according to my amazon history, I've purchased half a dozen TR6s and only 2 sets of TR7s so I vote to go back to the 6s and see if it fixes the issue.
Thanks for the fast reply! Will try that first before I start looking at other stuff. It is the LAST thing I did lol I wonder if my boost and timing is too low to use the br7 plugs..🤔
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Old Oct 1, 2021 | 04:49 PM
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That plug is too cold for you. Go back tr6
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Old Oct 4, 2021 | 12:26 PM
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4.8 LS Breaking up under boost only!


Avoid boost...
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Old Oct 4, 2021 | 02:42 PM
  #14  
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99% of the time when I have a misfire issue it is from the ignition system. Either plugs, wires, or coil packs.
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Old Oct 4, 2021 | 03:50 PM
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There is a point at which a conservative approach to the toon goes from safe to inoperable. That extremely low boost, relatively rich mix and super low spark is a recipe for tooner induced misfire. If you cripple it that much, there's a good chance you're going to feel some dead misses. I see this all the time on cam swapped cars at high load/low rpm. The combustion is just garbage in that area with stock settings because the spark is so low - it literally makes itself misfire. I'm betting you are seeing similar effects, and no thanks to the decapped injectors either. You need to do something to get the combustion moving faster. Leaner, more spark, more boost (not all at once) and probably some better injectors. Baby steps though.
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Old Oct 5, 2021 | 11:41 AM
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Originally Posted by smokeshow
There is a point at which a conservative approach to the toon goes from safe to inoperable. That extremely low boost, relatively rich mix and super low spark is a recipe for tooner induced misfire. If you cripple it that much, there's a good chance you're going to feel some dead misses. I see this all the time on cam swapped cars at high load/low rpm. The combustion is just garbage in that area with stock settings because the spark is so low - it literally makes itself misfire. I'm betting you are seeing similar effects, and no thanks to the decapped injectors either. You need to do something to get the combustion moving faster. Leaner, more spark, more boost (not all at once) and probably some better injectors. Baby steps though.
thanks for the reply! I will be going back to TR6 plugs and will lean it out a hair. I will put back in timing once I get the fueling dialed in!
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