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Old 02-15-2009, 11:52 AM
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cold buzz test

So I did a buzz test early in the morning, before a warm engine, and it sounds like 5 and 6 are weak. Warm up the engine and they all sound the same. my problem is good boost, but lower power and rough acceleration. cruising at 60, there is a loud humming from the motor and a vibration from the motor. any ideas? should i pull valve covers and unplug those injectors to see if it changes the way the engine idles?
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Old 02-15-2009, 12:20 PM
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Quote:
Originally Posted by droobie d View Post
So I did a buzz test early in the morning, before a warm engine, and it sounds like 5 and 6 are weak. Warm up the engine and they all sound the same. my problem is good boost, but lower power and rough acceleration. cruising at 60, there is a loud humming from the motor and a vibration from the motor. any ideas? should i pull valve covers and unplug those injectors to see if it changes the way the engine idles?
Did you do a cylinder contribution test as well.

The buzz test tells you if the injectors are working properly.
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Old 02-15-2009, 12:58 PM
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How do you do the buzz test?
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Old 02-15-2009, 01:01 PM
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Quote:
Originally Posted by KeepinItFord View Post
How do you do the buzz test?
You need a diagnostic computer, or a lap top that has Auto Enginuity on it. The buzz test is a KOEO diagnostic test. A cylinder contribution test is a KOER diagnostic test.

KOEO= Key On Engine Off

KOER= Key on Engine Running
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Old 02-15-2009, 03:08 PM
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Quote:
Originally Posted by bigcountrysg View Post
You need a diagnostic computer, or a lap top that has Auto Enginuity on it. The buzz test is a KOEO diagnostic test. A cylinder contribution test is a KOER diagnostic test.

KOEO= Key On Engine Off

KOER= Key on Engine Running
Interesting, theres a Snap On diagnostics computer at my work for cars. will that work on my truck or do i need a different one for diesels?

Sorry not trying to HiJack, its just i asked this in another thread but it got closed so i figured you did it so youd know.
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Old 02-15-2009, 03:17 PM
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Quote:
Originally Posted by KeepinItFord View Post
Interesting, theres a Snap On diagnostics computer at my work for cars. will that work on my truck or do i need a different one for diesels?

Sorry not trying to HiJack, its just i asked this in another thread but it got closed so i figured you did it so youd know.
I can not say for sure or not if the Snap on tool will do these tests or not. Because I do not know which Snap On tool you have at work.
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Old 02-15-2009, 03:50 PM
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Oh ok lol well illl have to give it a look at.
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Old 02-15-2009, 03:58 PM
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yeah, i did a cylinder contribution test and everything checked out.
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