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What happened to my injector?

Old 11-11-12, 07:26 AM
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What happened to my injector?

I pulled my motor to send it out for rebuild and noticed an injector clip looked to be melted from a possible short? Attached is the injector and clip. I'm going to send the injectors out again for cleaning and replace the clip but am trying to figure out why that would happen. The motor in the car now only lasted 2 hours (no I didn't build it) so this just happened. When trying to diagnose what was wrong with the motor someone else was using a test light and probing the injector wires to make sure the injectors had power. I am thinking that might have been related? Any ideas, would like to make sure I address whatever caused this to happen.
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Old 11-11-12, 07:29 AM
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possible loose connector pins would cause that
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Old 11-11-12, 02:55 PM
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Failed/shorted injector coil. It happens more often then you'd like to think.
Replace the injector with a new one.
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Old 11-16-12, 08:20 AM
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Originally Posted by nofords View Post
Failed/shorted injector coil. It happens more often then you'd like to think.
Was not aware that happened, thanks for the info. I was going to buy a used replacement for the dead one and then send them all off for cleaning and testing again.

But, if this is a somewhat common occurrence would it help any to buy brand new RC Engineering injectors instead of having 25 year old injectors cleaned?
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Old 11-16-12, 12:58 PM
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I would have to say yeah... New > 25 year old when it comes to electrical bits...
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Old 11-16-12, 02:00 PM
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i've seen one injector that was bad, we ran a 25 with too much duty cycle, and it fried em.
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Old 11-17-12, 06:34 PM
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Originally Posted by SCCAITS View Post
But, if this is a somewhat common occurrence would it help any to buy brand new RC Engineering injectors instead of having 25 year old injectors cleaned?
Well, I will say that for the cars purpose, new RC injectors are infinitely more reliable than rebuilt stock ones. It's not worth chancing when the end result my be dropping a rotor.

Your $150 injector is now $3,000!

RC injectors are also great pieces and are worth every penny!

Last edited by nofords; 11-17-12 at 06:37 PM.
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Old 11-17-12, 07:04 PM
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the test light most likely shorted out the injector
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Old 11-26-12, 09:29 PM
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Originally Posted by Donovan N. View Post
the test light most likely shorted out the injector
For every good original injector, I have 2 bad ones. Rx7 injectors take a lot of heat. Especially the primaries. Anyone who asks a 25yr old injector to run at a higher duty cycle for extended periods of time is asking for trouble.

With fuel related deaths of engines very rampant, why would you risk a $3000 rebuild on a set of 25yr old injectors? Rebuilt or not...

I've probed and prodded my injector wires with both stock and aftermarket computers. I've inadvertantly crossed wires and grounded injectors and the only time I've seen this is when the injector coil was internally shorted, not externally.
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