Injector Buzz Test - General Question
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Fleet Mechanic
Joined: Feb 2007
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Injector Buzz Test - General Question
The other day I was helping a friend with a '96 OBS do a little troubleshooting. We used Forscan on my PC to do an injector buzz test. During that process we disconnected two injectors.
I was under the impression that what you are supposed to hear is all of the injectors buzzing together at first, then each of the eight injectors buzzing individually. However, with the two injectors disconnected, we still heard eight distinct buzzes (after the initial group buzz).
So what else is buzzing?
I was under the impression that what you are supposed to hear is all of the injectors buzzing together at first, then each of the eight injectors buzzing individually. However, with the two injectors disconnected, we still heard eight distinct buzzes (after the initial group buzz).
So what else is buzzing?
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Fleet Mechanic
Joined: Feb 2007
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Huh... Doesn't seem like it would be nearly as useful of a test, if they all buzz at once.
Papa Smurf
Joined: Nov 2009
Posts: 1,080
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From: Woodstock, GA
Thinking back... and my memory is terrible.... but was thinking it buzzed each injector, then the last was all eight at once. And do it when the engine is cold, like first thing in the morning before you crank it.
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Fleet Mechanic
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Hotshot
Joined: Jul 2008
Posts: 12,782
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From: N.GA Mountains
With one or two injectors unplugged, you can hear a buzz when it’s time for those to buzz - but the noise will come from the other injectors.
You should have gotten P127x ‘high to low side open’ or similar DTC with injectors unplugged.
You should have gotten P127x ‘high to low side open’ or similar DTC with injectors unplugged.
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From: Sault St.Marie
People say to listen to each buzz sound difference.
Now, what does that sound difference indicate?
Sorry, I'm just a little confused now, as I was using the sound to isolate a tight armature on an individual injector.
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Fleet Mechanic
Joined: Feb 2007
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Kind of surprised this is how it works. It seems like it would be so much more useful if it buzzed each injector completely individually.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
It does. Unless there is a open line or a short to ground. In those instances it’s possible to hear a ‘ghost buzz’ on other injectors.
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