Although there are many problems that can cause the intake system to backfire the overall effect is the same. Ls style 4 bolt intake manifold aluminum throttle body housing with cable drive 92mm single blade.
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Fitech backfire through throttle body. I still have an issue with a very slight hesitation but its sooo much better than the carb. Vw volkswagen bug bus ghia thing all. Once engine is running and at operating temperature turn on idle set mode. Backfiring through the exhaust is a result of problems arising out of rich fuel mixture and out of turn sparking of spark plugs. There is more fuel and less air. If any body else is having this problem check the tps sensor and give it throttle when the engine is running.
All wires are in proper sequence. On a carb when the throttle is slammed open nothing happens outside of the accel pump shot until air velocity through the carbs throttle bores increases. The ratio of air to fuel in the mixture gets skewed in favour of fuel ie. To get engine to start you may have to press the throttle pedal slightly. I too have experienced a stiff throttle. Fitech fuel injection does not represent or warrant that the functions contained in the site will be uninterrupted or error free that the defects will be corrected or that this site or the server that makes the site available are free of.
If the engine wont stay running without keeping your foot on the pedal a little turn the throttle adjustment screw clockwise another half turn. This is why a steady throttle foot is necessary for best efi fuel economy. Still playing with it. Not a real issue but it does catch me off guard at times. I had a backfire through the throttle body the other day. Engine is popping thru throttle body starting at 2000rpm.
Cause of backfiring backfiring is a small explosion. Man is that a sneaky problem or what. Since the intake valve needs to provide the engine with a proper balance of fuel and air a backfire occurs when that balance fails. This locks the ecu in idle. My guess is the tps was telling the computer the throttle was closed giving the engine very little fuel causing it to go lean and backfire randomly when driving. Look at the fitech system and all the wires duration.
Thinking my timing might be a wee bit off.
Gallery of Fitech Backfire Through Throttle Body
