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Fuel Injectors Not Firing - New Engine Install

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Old Nov 12, 2006 | 10:45 AM
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Fuel Injectors Not Firing - New Engine Install

I put in a rebuilt long block into an RX-7 shell. It turns over but does not start - even with the F/P pin shorted to GND.

After much cranking, the spark plugs do NOT smell like fuel.
I verified that the fuel pump is working by shorting F/P to GND and watching fuel spew out of the return line connector on the block.
The TPS seems to give voltages that are within spec or extremely close to spec.
The starter signal wire gives 8V+.
I did the procedure for reading engine codes, but there were none.

Please help!
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Old Nov 12, 2006 | 10:48 AM
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Also, it was only trying to fire one of the spark plugs when cranking. I think it was the Leading. Is that normal? The timing light looked OK when shined on the pulley.
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Old Nov 12, 2006 | 08:04 PM
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To clarify, it turns over and there is no combustion at all. The fact that my plugs didn't smell like fuel, means the injectors aren't firing. Its all stock except intake, IC, and exhaust. Can anyone help?
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Old Nov 12, 2006 | 08:35 PM
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have the fuel injectors been cleaned by rc engineering or something? they could be stuck if it's been sitting for more than 2 weeks after they have been cleaned.
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Old Nov 12, 2006 | 08:38 PM
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Try this:
https://www.rx7club.com/showthread.p...drums+injector
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Old Nov 12, 2006 | 09:04 PM
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Originally Posted by RX7 RAGE
have the fuel injectors been cleaned by rc engineering or something? they could be stuck if it's been sitting for more than 2 weeks after they have been cleaned.
This is what happened to me when I put in my reman. My injectors sat in my garage for 4 months and the rear primary got stuck. I had to remove the injector and sprayed it with a little rubbing alcohol. It worked fine after that.

Good luck.
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Old Nov 27, 2006 | 01:01 PM
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Thanks everyone. I used a Noid light to verify that the computer was trying to fire the injectors. Then I dug into the engine and used a 9V battery to find out that BOTH primary injectors as well as one of the secondaries were stuck. A few taps with the hammer, and my car started.

However it runs rough at 2700 RPM and at ~1400RPM idle. Also it spews flames out the exhaust at idle. I don't have the intercooler pipes for it yet. So the turbo output just goes to the environment. The throttlebody sucks sucks air in directly from the environment. Is that causing the car to run rich and rough or is there likely something else?
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Old Nov 27, 2006 | 01:10 PM
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Its something else.

Start by pulling the ECU codes to see if something is being triggered (but not necessarily showing the CEL).
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Old Nov 27, 2006 | 01:44 PM
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Make sure you don't have any open nipples on the UIM or LIM.
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