The GraveYard. So, now as I try to start it, I make sure to rotate the ignition switch quickly to the off position rather than the run position. This is usually the case with carbon-blocked or stuck-close EGR valves. May 10, 2019 #4. The Virtual Lounge. Member's Rides/Appearance. Site Suggestions. This can happen under load when: 1) timing chain is worn 2) rocker arm/s is maladjusted or worn, ditto the rest of the valve train 3) slightly burned intake valve face or seat, or worn valve guide This is a discussion on Heavy backfire when under a load within the General Help forums, part of the LSx Technical Help Section category; Lately ive been getting a single heavy backfire every time i shift when im around 5k-6k rpms. 350 chevy firing order is 18436572. Sometimes she stutters and then backfires when I first step on the gas and sometimes at about 40 mph. I did try spraying some starting fluid into the intake, & with the throttle wide open during cranking I did get a couple coughs & sputters like it was trying to fire. My problem is that when I try to start the engine it will crank for a few seconds and then backfire through the throttle body. Bad plug wires can also short onto each other and cause the wrong cylinder to fire while it's intake valve is still open, igniting back into the intake. I have a 2001 ls v8 I took off the 02 sensors before cats and its higher idle but still backfires through intake . Has anyone figured out this problem im going crazy trying to figure out why my lincoln ls is popping thru the intake. Footage taken from Holley Carburetor Installation & Tuning DVD When i bought it the car would bog down at low rpm's and backfire like crazy so i replaced the spark plugs and it ran great but it would still backfire when i tried to get accelerate. Question: I have a 1957 Chevy with a 283. Since I have been doing that, no backfire. Hi i have a 94 camaro z28 lt1 6 speed. I'm not losing any power. Video. Hiccup intake backfire. Recreational. Most likely cause of my intake backfiring was #5 & #7 plug wires switched. Came out through the intake manifold, figured that out when I removed the throttle body. Come discuss mods, horsepower, engine specs and more! Full Forum Listing. In general if the engine backfires through the carb one or more intake valves is open during ignition on one of the cylinders. I have a k&N cold air intake … Backfiring through Intake. While Chevrolet Performance makes a popular 4 barrel intake (part #25534394), it is our friends at Edelbrock who offer the widest and most popular selections of carb-ready LS intake manifolds on the market today for LSX engines. Board Announcements. Pulled plugs all clean. Lounge. ... 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