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Sounds like you could have an aux air regulator valve, that is not
working when it will not work; there is no fast idle cold. Should be around 1500 rpm cold, the car will stall out and pop through the intake when bad. You have a digital volt meter to do some testing with to make sure the mass air flow is working correctly. Also, check the plugs for how they're burning, check the air filter for good flow, do a compression test and judge from there. Intake backfire is usually caused by running lean or improper timing.
For the 79 model zx, ignition timing was 10 degrees BTDC @ 700rpm For 80 and up zx, non turbo - 8 degrees BTDC +- 2 degrees @ 700rpm turbo - 20 degrees BTDC +- 3 degrees @ 700 rpm
Also done with distributor vacuum advance hose removed and plugged. NOTE: * BTDC = Before Top Dead Center * + - = Plus or minus
Hope thos helps; keep us updated.
Unplug the Air flow meter. Try and start it. If it starts then you need a new AFM. If not then it can be any of the ton of sensors on the motor. You might have to have it looked at by a shop. Good luck.
have you reset the ecu? disconnect the battery for 5 minutes. make sure you have any radio codes if your radio has a security code lock.
Also could be the idle control stepper. Mitsu gives it some name like ICU but it's a small mottor attached to the throttle that opens and closes valves to let a little more air in and up the rpm.if it's sticky try cleaning the throttle and the valves.
You have upset the air flow meter You need to replace the air box lid.the flow of air past the airflow meter must be comsistant and surge free.the factory match the flow of air to the afm and they are like siamese twins,they are a matched pair.If you return the air box and rest of air intake to factory parts your problem will go away.Im sure these problems began to appear when you started changing parts and cutting holes.Good luck
That's not going to work. You can't install a air flow meter into a Pulsar from a Q45. Totally different animals. Air flow meters are car specific. I don't think its gonna work, but good luck with that.