Panthera19
Newish Member
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- Jan 12, 2026
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Does anyone have experience with the GFB blowoff valves when having them set up to recirculation and atmosphere with the trumpets installed causing a misfire under boost? When I installed the JB4 I included the HKS plugs, and had a misfire on the first pull i did on map one. Car ran fine on map 0. The next step I took was coils because my car has 59k miles, replaced with worms coils, and it still misfired but I got 1 pull out of it. Misfire happened on a very mild pull. My next thought was maybe its because of air/fuel mix because the trims went up to about 35 when it misfired. I replaced the trumpets with the stoppers for the GFB kit and everything seems to have smoothed out on map 0. Once the weather gets better I plan to do a map 1 pull from 3rd at 2500 to 5000k and I'll post the log to see what you all think. Thanks for any thoughts or suggestions in advance!
