Injector Buzz Test on Startup

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Aug 21, 2021 | 05:38 AM

Mcrafty1

Thread Starter

Fleet Mechanic

Joined: Jul 2013

Posts: 1,330

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From: 'Pitlock, Maine

Injector Buzz Test on Startup

As of late my 2007 6.0 doesn't do the buzz test and cranks a bit longer before cold startup, five or six seconds compared to two or three when it did the buzz test, after that it starts normal until overnight cool down. The only gauge I have is Scangauge but no codes show there...(big surprise) and no CEL or Wrench lights. Truck runs great throughout the process and after initial startup it works as it always has...good. Any thoughts as to why the buzz test stopped and could it be related to the longer cold crank time? Thanks for any and all input.

Aug 21, 2021 | 05:58 AM

Hartwig

Cargo Master

Joined: Oct 2018

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From: unfortunately Germany

Which scantool are you using? Glowplugs getting power?
no buzz should be wiring issue.

Aug 21, 2021 | 08:47 AM

Mcrafty1

Thread Starter

Fleet Mechanic

Joined: Jul 2013

Posts: 1,330

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From: 'Pitlock, Maine

Scangauge, I know...it's a poor choice but served me well for the past 8 years that I've owned the truck. The glow plug light functions although I don't know for sure if that is actual or demanded. I will look in that direction. Thanks. Also when I watch the gauge while cranking the sync seems a bit slow and the ICP doesn't respond like it used to, it starts at zero and in the time it takes to fire goes from that to 1200ish in one jump so that leads me to believe it's actually building pressure but the ECM isn't seeing it as quick as it should. It actually seems like the ECM isn't coming on line as quick as it should,that's just an observation.

Also I had a new turbo installed recently and some AC work so possibly they did something to the wiring that may be causing my issues. Thanks for the reply

Another after thought, do you or anyone else reading this know if there is a relay or fuse directly linked to the buzz test that may be the culprit? Any insight into this will be welcome. Thanks again.

Last edited by Mcrafty1; Aug 21, 2021 at 08:50 AM. Reason: More content

Aug 21, 2021 | 10:09 AM

Hartwig

Cargo Master

Joined: Oct 2018

Posts: 2,808

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From: unfortunately Germany

Crank position sensor is behind AC comoressor.
damaged when changed compressor?

You do buzz test with your scanner??

Aug 21, 2021 | 06:03 PM

Yahiko

Fleet Owner

Joined: Apr 2012

Posts: 27,307

Likes: 549

From: Spanaway

Have you ever had the Stand pipes and dummy plugs replaced?

Also what are FICM Main Power and Logic Power showing?

Also there is a SGII code for setting up the Glow Plug on time.

Aug 22, 2021 | 05:10 AM

Mcrafty1

Thread Starter

Fleet Mechanic

Joined: Jul 2013

Posts: 1,330

Likes: 65

From: 'Pitlock, Maine

To my knowledge the valve covers have never been off this engine. The FICM logic power power is 13.5 and the and it shows 47.5 to 48.5 when the engine is running.