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My 96 750 katana just started backfiring all the time. On acceleration and decceleration. It also wont start unless the throttle is wide open and dies as soon as u let off.
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The throttle is stuck, may be from corrosion from sitting. Find where its stuck, correct that and you should be OK. When the throttle is wide open, the choke plate will not be closed fully, and if you can't pump the throttle, the accelerator pump can not function (the pump must stroke to work)
Starting Mode
With the ignition switch in the ON position, before engaging the starter, the PCM energizes the fuel pump relay for 2 seconds allowing the fuel pump to build up pressure. The PCM first tests speed density, then switches to the mass air flow (MAF) sensor. The PCM also uses the engine coolant temperature (ECT), the throttle position (TP), and the manifold absolute pressure (MAP) sensors to determine the proper air/fuel ratio for starting. The PCM controls the amount of fuel delivered in the starting mode by changing the pulse width of the injectors. This is done by pulsing the injectors for very short times.
Clear Flood Mode
If the engine floods, clear the engine by pressing the accelerator pedal down to the floor and then crank the engine. When the throttle position (TP) sensor is at wide open throttle (WOT), the PCM reduces the injector pulse width in order to increase the air to fuel ratio. The PCM holds this injector rate as long as the throttle stays wide open and the engine speed is below a predetermined RPM. If the throttle is not held wide open, the PCM returns to the starting mode .
You could have a dirty or bad mass air flow sensor .
You could have
If you are lucky, you might just need new fuel filter and the fuel bowl cleaned out, and maybe new air filter. If not so lucky you need carburetor rebuilt. Backfire is usaully caused by engine running too lean ( too much air for the amount of fuel present). Fuel bowls get gunk in them and the fuel needles and fuel jets get varnished up. The accelerator pump gets worn out gaskets and/or bellows and doesn't give the right amount of fuel mist when you accelerate.
Full Choke is indicative of a motor starved for fuel
The F1 light is an engine management error, take it to your nearest dealer and get them to run their diagnosis machine on it. You may have a mixture problem or an ignition timing problem.
I would start with checking the plugs, wires, coil packs. If you haven't had a tune up in a while it will never hurt to replace these. Also check and clean throttle body. Check all around your intake manifold at each vacuum line for cracks and or leaks. May also be your catalytic converter. Does it run fine in park and neutral but have a loss of power in gear. Hope this helps
I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?
If your bike is carburetor equipped, I'd suspect that you have a jet in the carburetor that is stopped up or the accelerator pump on your carb is not working correctly.
To check the accelerator pump, remove the air cleaner cover and the air cleaner element. Wtth the bike NOT running. Look into the carburetor and crank the throttle wide open. You should see a stream of gasoline come out of the small brass piece and squirt into the carb in a continous stream from time you start opening the throttle until you get wide open. If you do not see this, you need to remove the float bowl and clean it out and replace the diaphragm in the accelerator pump on the float bowl.
Are you talking about "backfiring" out the exhaust or "spitting back" through the carb?
Backfiring through the exhaust under acceleration is rare. If he ignition is misfiring, unburned fuel and air mixture is exhausted into the exhaust system. The next time the plug fires, it ignites this mixure. In other words, your engine is "missing" and your ignition system needs attention.
If it's "spitting back" out of the carb, this is usually an indication of a lean mixture. If it's doing it at wide open throttle, you might need to go up one size one your main jet. If it's doing it under less than full throttle acceleration, raise your needle up one notch and try it again. You want to richen the mixture just a bit. Too much and the bike will get sluggish.
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