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Fuel injector; Need a bad one to test
Topic Started: Oct 20 2017, 11:08 PM (181 Views)
freegeo
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I'm starting this thread to see if there is anyone that may have a bad fuel injector that they may want to part with? I'm trying to set up a way to clean fuel injectors and test them.

In another thread Mr1 Kingsbury posted this.

Quote:
 
I have an injector with an intermittent no start condition..... Not quite what is discussed here. I've used it a couple times as a test replace to see the short term fuel trim differences and to diagnose the O2 sensor cel.

turned out I had a bad injector that did not leak but would constantly overfuel the engine and O2 was tripping the cel because it never got lean enough to change voltage. Test injector seemed to solve the cel.
New injector was instant fix.

I have at least 1 injector I could part with for clean and test.... Is there a voltage and/or resistance test that you can put them through after cleaning??



Not really a voltage test that can be done. I think there is a resistance check in the FSM. If I can find that value it can be checked.

The thing i would want to be looking at most is the flow rate and spray pattern. I bought a cheap injector that looked to be just like the OEM bosch unit that comes in the throttle body. Once putting it in the cheap injector was letting in more fuel that the OEM one. My STFT (short term fuel trim) was buried -20 and the LTFT (long term fuel trim) was starting to correct the STFT. Mine didn't get as bad as Mr1 Kingsbury that it would set a code but it wasn't far from it. Did the cheap injector have a different return spring, Pintle size or was in some way electrically different, I don't know. I just know that not all fuel injectors are the same.

I would want to check how much gas flows through the injector at a certain pressure within a certain time. Before and after cleaning.
Edited by freegeo, Oct 21 2017, 04:10 PM.
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Iconn
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ICONN

Yes this defective Davco looks significantly different from the Bosh
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freegeo
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Thanks for the response.

I tried out the injector tester I recently got and it is not working. So my plans to test and clean injectors will be put on hold temporarily.
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freegeo
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Found this Youtube video that shows the potential problems with the cheaper fuel injectors. This is not one that would work in a metro but the OEM injectors were Bosch.

If you can find them in the junk yard it would be worth picking them up.

https://www.youtube.com/watch?v=l2ne6AVnF2k
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