cold buzz test - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 02-15-2009, 10:52 AM Thread Starter
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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?

1999.5 F350 XLT SD Reg. Cab Long Box 4X4
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afe Stage II cold air intake
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post #2 of 8 Old 02-15-2009, 11:20 AM
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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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post #3 of 8 Old 02-15-2009, 11:58 AM
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How do you do the buzz test?

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post #4 of 8 Old 02-15-2009, 12:01 PM
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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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post #5 of 8 Old 02-15-2009, 02:08 PM
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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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post #6 of 8 Old 02-15-2009, 02:17 PM
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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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post #7 of 8 Old 02-15-2009, 02:50 PM
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Oh ok lol well illl have to give it a look at.

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post #8 of 8 Old 02-15-2009, 02:58 PM Thread Starter
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yeah, i did a cylinder contribution test and everything checked out.

1999.5 F350 XLT SD Reg. Cab Long Box 4X4
DP Tuner
6 spd manual
afe Stage II cold air intake
Banks Six Gun tuner (expensive digital gauge)
4" turbo back straight pipe
high pressure crossover line
x-wheel



1995 Ford Ranger
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