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Old 01-09-2010, 09:57 PM
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Injector Buzz test basics

Howdy all,

I've got a couple of basic questions about injector buzz tests. I know that the terminator scan gauge and the AE will both do them. Now onto the questions

1. Are the same things required for the 'buzz' that are required for the injector to fire when the truck is running / starting? I.E. Voltage, fuel pressure, oil pressure so on an so forth, or just a good solid connection?

2. If you are not getting a buzz with a particular injector or all the injectors but the tach is still moving is that indicative of a failure of the injector(s) or the signal to that injector(s)? Or does it pass if the tach still moves?

3. How many 'buzzes' should there be? I've had one loud one followed by 8 softer ones. I am assuming that it is all 8 buzzing then each individual one.

4. At the end of the 9 buzzes should there be anything else? Reason being is my scan gauge continues to say 'testing' but nothing else happens, even after 5 minutes. Is this a failure of my truck or the gauge?


Thanks in advance, hope this clears some things up about this process.

JP5
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Old 01-10-2010, 04:58 PM
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Re: Injector Buzz test basics

1. no (buzz test = electrical continuity test) ie totally POS injectors will "pass" the buzz test if they are plugged in.

2. possibly either an electrical (wiring, IDM, solenoid) problem..or an internal injector issue (mechanical)...tach movement doesn't mean chit

3. 9. all (8 injs) simultaneous and then 1-8 numerically in order.

4. don't know...I would expect after a couple of minutes that the scangauge would return some result (as a scan tool would)...but I've never used a scangauge.
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