Ls style 4 bolt intake manifold aluminum throttle body housing with cable drive 92mm single blade. 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.
Fitech Efi Update V8buick Com
Fitech backfire through throttle body. Since the intake valve needs to provide the engine with a proper balance of fuel and air a backfire occurs when that balance fails. If the engine wont stay running without keeping your foot on the pedal a little turn the throttle adjustment screw clockwise another half turn. There is more fuel and less air. Although there are many problems that can cause the intake system to backfire the overall effect is the same. Man is that a sneaky problem or what. Look at the fitech system and all the wires duration.
The ratio of air to fuel in the mixture gets skewed in favour of fuel ie. This is why a steady throttle foot is necessary for best efi fuel economy. Cause of backfiring backfiring is a small explosion. All wires are in proper sequence. Once engine is running and at operating temperature turn on idle set mode. Vw volkswagen bug bus ghia thing all.
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. I still have an issue with a very slight hesitation but its sooo much better than the carb. Backfiring through the exhaust is a result of problems arising out of rich fuel mixture and out of turn sparking of spark plugs. If any body else is having this problem check the tps sensor and give it throttle when the engine is running. 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. To get engine to start you may have to press the throttle pedal slightly.
This locks the ecu in idle. Thinking my timing might be a wee bit off. I too have experienced a stiff throttle. Engine is popping thru throttle body starting at 2000rpm. Not a real issue but it does catch me off guard at times. I had a backfire through the throttle body the other day.
Still playing with it.
Gallery of Fitech Backfire Through Throttle Body
