Mazda Repair Questions? Ask Mechanics for Answers ASAP
Hello I will help,
It probably is the computer failing. Most of them do. The injectors are fired in pairs so first thing to do is pull the computer mounted in front of the passenger door opening and open it for inspection. If you see any burning or a whitish substance on the circuit board near the can capacitors you need another computer.
let me know how I can help you with this
Then it could still be the computer have you looked at the photos online of damaged ones?
Are you confident you know what to look for?
The is no computer to put it on. All testing is done by visual inspection or point inspection with a voltmeter.
Take a look at this site for images
It is so common for the computer to fail you have to be absoutely sure the computer is clean before proceeding to pinpoint test.
Do you know anyone with a 2600i? Maybe you could borrow their computer for 10 minutes to check if the problem goes away?
The power for the injectors comes from the fuse block through the large injector connector under the intake. The ground for the injectors is through the computer. If the ground wire to the computer were shorted to ground then the injectors would stay on all the time the key was on. Inside the computer the injectors are grounded through one of the transistors mounted to the side of the case. It is common for this type of transistor to short and ground all the time. Usually there are slight burn marks where the transistor is soldered to the circuit board or where the large connector is soldered to the board.
You can check if the injectors are shorted with a meter, same for the wire to the computer.
Has any work been done or damage to the wiring? A visual inspection of the wiring would be the best place to start. You can only get to the #1 injector without removing the intake, the large connector near the back you can see the wiring running into from the injectors will be the place to check.
I can't walk you through all the testing and how to do it, that would be many hours work.
No, as I posted above they are fired in pairs so one transistor runs the ground for each pair of injectors. 1 and 3 are a pair, 2 and 4 are the other pair.
I really think your issue is in the computer Maybe you could take it to a shop and have them take a look?
I am going to OPT OUT as this is much more work than I am willing to do here