cold buzz test

[droobie d]

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?

[bigcountrysg]

Originally Posted by droobie d

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.

[KeepinItFord]

How do you do the buzz test?

[bigcountrysg]

Originally Posted by KeepinItFord

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

[KeepinItFord]

Originally Posted by bigcountrysg

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.

[bigcountrysg]

Originally Posted by KeepinItFord

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.

[KeepinItFord]

Oh ok lol well illl have to give it a look at.

[droobie d]

yeah, i did a cylinder contribution test and everything checked out.