Is Backfiring normal
#1
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Is Backfiring normal
My 7 seems to backfire alot on deceleration is this normal as nobody in the real world seems to know.
The exhaust has been replaced with a jan speed and the air blower etc has been removed .
If it aint normal what can i do to fix it.
Stu
The exhaust has been replaced with a jan speed and the air blower etc has been removed .
If it aint normal what can i do to fix it.
Stu
#2
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From my limited experience with rx7s I would say it is normal. All of the mostly stock ones with air pump removed run quite rich, which are the ingredients for backfiring.
#4
Former FC enthusiast
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From what I read here with all the cats removed its normal. I had a custom Y pipe done that removed the main cat and it would backfire everytime I'd redline at WOT and let off/shift. Now after having gutted my precat (busted honeycomb) it backfires noticeably louder.
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#11
HAILERS
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One of the REAL roles of the TPS is what RETed mentioned above. When you let off the throttle, the injectors shut off, or are supposed to shut off. On a properly set tps they will. If the fuel does not shut off when you let off the pedal, then excess fuel goes into the rotor chamber and explodes in the exaust.
Also, the ACV has a anti afterburn valve built into it. That puts airpump air into the INTAKE during rapid deceleration to lean the mixture out that is going into the exaust. That's the only time a ACV should put air in the intake.
Also, the ACV has a anti afterburn valve built into it. That puts airpump air into the INTAKE during rapid deceleration to lean the mixture out that is going into the exaust. That's the only time a ACV should put air in the intake.
#13
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The tps adjustment is a screw near the tps sensors. It is on the cam that moves the throttle position sensor button as you move the throttle plates. It is not the lean/rich screw or the intake air bypass screw. Adjust it with an ohm meter or the 2 lights method.
#16
Rotary Gearhead
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Several causes of backfiring but 2 main ingredients.....air and fuel. When you remove a cat, or gut it, there is more unburned fuel in the exhaust than with a well-functioning cat. Anything that is making the mixture excessively rich sets up a dynamic for backfiring. Excessive oxygen entry from leaky exhaust gaskets, bad air injection control valves, etc. adds to this. My N/A backfired every time I accelerated hard until I got my 5th/6th ports to start working again. Rarely backfires now and just barely when it does. Hailers is right, the tps plays a major role in shutting off the injectors on decel if adjusted properly.
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