injectors or not
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Junior Member
Joined: Jul 2005
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From: Denver, Colorado
injectors or not
Okay I have a 1987 mazda rx7 turbo II, when I bought the car it look like it had been sitting for a while. Every time I try to start the motor it cranks but it doesent start even after I push the gas pedal. I checked my fuel lines and put a new fuel filter and a new fuel pump and still it wont turn over or start. I lossen the bolt that is in the front of the fuel rail and fuel squirts out. Is letting me know gas is reaching the fuel rail but I dont know if the fuel injectors are passing any fuel. 
Please can anyone help me!
Im trying to find out how fast it really is
Please can anyone help me!
Im trying to find out how fast it really is
Senior Member
Joined: Mar 2002
Posts: 637
Likes: 2
From: San Antonio TX
I'm only addressing your question about what's going on with the injectors, and ignoring any potential ignition or compression problems.
My TII would not start after sitting a couple of years, and the problem was, indeed, gummed up fuel injectors. You can do a lot of troubleshooting, but I think the best expedient course of action is:
1. Check for flooding, as gigenhagen suggested, and clear it if required.
2. Spray a shot of starter fluid in the intake, and see if the motor catches.
2a. If the motor catches, you have a fuel problem, and since you know you have flow to the rail, there's a good chance it's the injectors.
3. If so, I would then check the voltage in the injectors' circuit. For me, the easiest place is at the solenoid resistor pack located somewhere below the stock AFM/airbox assembly. You can stick a meter lead in the output side of the connector (just the primaries), pull the CAS and rotate the shaft (or turn your motor over with the starter), and see what happens.
4. If you have voltages to the injectors, I think your next step is to pull the UIM and injectors, and test them by wiring them into the rail with their electrical connectors attached, and rotating the CAS. Make sure your ignition switch is on, and that you've jumpered the test plug on the passenger side strut tower.
4a. If you have fuel flow in the rail, voltage to the injectors, and no spray from the injectors, then they are inoperative or gummed up. If neither of the primaries spray, gumming is the most likely reason.
My TII would not start after sitting a couple of years, and the problem was, indeed, gummed up fuel injectors. You can do a lot of troubleshooting, but I think the best expedient course of action is:
1. Check for flooding, as gigenhagen suggested, and clear it if required.
2. Spray a shot of starter fluid in the intake, and see if the motor catches.
2a. If the motor catches, you have a fuel problem, and since you know you have flow to the rail, there's a good chance it's the injectors.
3. If so, I would then check the voltage in the injectors' circuit. For me, the easiest place is at the solenoid resistor pack located somewhere below the stock AFM/airbox assembly. You can stick a meter lead in the output side of the connector (just the primaries), pull the CAS and rotate the shaft (or turn your motor over with the starter), and see what happens.
4. If you have voltages to the injectors, I think your next step is to pull the UIM and injectors, and test them by wiring them into the rail with their electrical connectors attached, and rotating the CAS. Make sure your ignition switch is on, and that you've jumpered the test plug on the passenger side strut tower.
4a. If you have fuel flow in the rail, voltage to the injectors, and no spray from the injectors, then they are inoperative or gummed up. If neither of the primaries spray, gumming is the most likely reason.
Last edited by buttsjim; Aug 12, 2005 at 11:13 AM. Reason: Clarification
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