backfiring 12A
#1
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backfiring 12A
So here is the problem, just got a 1979 RX-7 and just got it running after sitting for a long time.
compression is good (had a mazda tech check that)
fuel pressure is ok
filter is ok
oil was good but changed it anyway
the car starts right up and idles very nicly. Anyway when you rev the motor it doesnt wana rev very quickly and when you do rev it it backfires up through the carb a bit...
I have checked the cap and rotor and wires seem to be all ok, plugs are new
all vacuum hoses are intact and in the correct location. there is a sensor??? on the pass side of the carb that has one wire coming off of it, it screws into the carb itself, that wire is broken off inside the sensor .... What is that sensor for
also the fuel guage doesnt work and I put 10 gal of mid grade fuel in ..
let me know what you think
compression is good (had a mazda tech check that)
fuel pressure is ok
filter is ok
oil was good but changed it anyway
the car starts right up and idles very nicly. Anyway when you rev the motor it doesnt wana rev very quickly and when you do rev it it backfires up through the carb a bit...
I have checked the cap and rotor and wires seem to be all ok, plugs are new
all vacuum hoses are intact and in the correct location. there is a sensor??? on the pass side of the carb that has one wire coming off of it, it screws into the carb itself, that wire is broken off inside the sensor .... What is that sensor for
also the fuel guage doesnt work and I put 10 gal of mid grade fuel in ..
let me know what you think
#3
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OK...let me be the first to suggest a simple search. Normally, I hate it when people respond by saying "search", because I know how hard it is to find what you're looking for. But in this case I know it would have been easy to find a recent thread discussing this very topic, because I started the thread!
https://www.rx7club.com/1st-generation-specific-1979-1985-18/backfiring-problem-531873/
Anyway, welcome to the forum, and good luck!
Rich
https://www.rx7club.com/1st-generation-specific-1979-1985-18/backfiring-problem-531873/
Anyway, welcome to the forum, and good luck!
Rich
#4
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no the car is not backfiring through the exhuast it is backfiring back up through the carb... makes a pop pop pop, whith the lid off the air filter you can see the flame come back up through..
strange I know
strange I know
#6
My wife bought me 2 RX-7s
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Definately sounds like timing to me. That 'sensor' on the passenger side of the carb isn't a sensor at all, it's the float bowl vent solenoid. You should get that fixed as it can cause the carb floats to overfill and flood if it isn't working properly.
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