Holley HP lq4 miss fire
04-28-2019, 05:28 PM
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Staging Lane
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Holley HP lq4 miss fire I have a lq4 with 243 heads, tick stage 2 cam, fast 90/90 intake. Tha car runs but not very well. It will backfire through the exhaust while running. I pulled plugs and noticed 2 cylinders on passenger side had not been firing. I also confirmed this has the header tubes were cold to the touch and the others were hot. I have spark as i pulled plug and had spark while turning the engine over with the fuel pump unplugged. I dont want to keep running the engine and hurt something. I am out of ideas and dont know what all the lines mean on the data log. I have searched and watched YouTube videos for months trying to figure this out. Any ideas or help is appreciated. Thanks
04-28-2019, 06:19 PM
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do u have injector pulse to the dead cylinders. have u tried swapping injectors from cylinder to cylinder to see if issue moves cylinders. due u have good compression in all cylinders
