BUZZ TEST ?
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More Turbo
Joined: Mar 2011
Posts: 683
Likes: 1
From: cincinnati, oh.
BUZZ TEST ?
ok, so i figured out how to do the buzz test. but what exactly should i be listening for. as some of you no i think i've got some clogged injectors due to dirty fuel i put in my tank.
it was getting dark and cold when i figured out how to do the test so i'm going to do it again today.
i heard all 8, then counted 8 one by one, so they are all buzzing. they all sounded about the same, not real loud and maybe not so crisp.
so what does this tell me ?
are they fine. or could they still have blockage and buzz anyway.
have i eliminated some of the causes, " uvch connections" problem.
whats your opinion? not the best speller
it was getting dark and cold when i figured out how to do the test so i'm going to do it again today.
i heard all 8, then counted 8 one by one, so they are all buzzing. they all sounded about the same, not real loud and maybe not so crisp.
so what does this tell me ?
are they fine. or could they still have blockage and buzz anyway.
have i eliminated some of the causes, " uvch connections" problem.
whats your opinion? not the best speller
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
When you do a buzz test it only test the electrical side of the injector.
Do one buzz test with engine cold then another with engine up to temp.
They should be loud and crisp.
Then do a Cylinder contribution test (CCT)
Do one buzz test with engine cold then another with engine up to temp.
They should be loud and crisp.
Then do a Cylinder contribution test (CCT)
Thread Starter
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More Turbo
Joined: Mar 2011
Posts: 683
Likes: 1
From: cincinnati, oh.
thanks for that guys, i'll be rechecking the buzz and doing the cct .
but what about my other questions, have i eliminated anything ?
also, is the cct a koeo or a koer, i dont want to be sad after the fact.
but what about my other questions, have i eliminated anything ?
also, is the cct a koeo or a koer, i dont want to be sad after the fact.
Veteran/Sheepdog
Joined: Feb 2012
Posts: 6,047
Likes: 110
From: Western AR
CCT is KOER...you will get an error if you try to do it with the engine off. What it does is drops one cylinder at a time while the truck is running and takes measurements of the results. You can hear the engine change pitch/sound while the cylinders are dropping out one by one during the test.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
The engine needs to be at temp for the CCT to get a reading. If you have the gray CPS you might get false reading on #3 and #8 injector.
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More Turbo
Joined: Mar 2011
Posts: 683
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From: cincinnati, oh.
ok, i ran the buzz test 2x, first time i heard what sounded like 2 of them not as loud. second time. all about the same.
then ran the "cct" got codes p0263,p0269,p0272 cylinders 1,3 and 4 say, injector circuit contribution fault.
so what is that telling me.
then ran the "cct" got codes p0263,p0269,p0272 cylinders 1,3 and 4 say, injector circuit contribution fault.
so what is that telling me.
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More Turbo
Joined: Mar 2011
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From: cincinnati, oh.
it was installed 2 years ago, ford recall . not sure of the color
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
Nothing really. I mean, you could spend a lot of money throwing parts at the truck and hoping for the best.......
What in the world is your truck doing that gives you the impression that something is wrong? Cylinder contribution tests and buzz tests are a huge waste of time (and money when people start replacing stuff "just because") if the truck runs good.
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More Turbo
Joined: Mar 2011
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From: cincinnati, oh.
here is the story about what happen with the truck.
awhile back i put diesel fuel in my truck from a tank that used to be a home heating oil tank, we was using that old tank to transport fuel. i was told it was a clean tank , ready to go. i asked first, he lied. long story short, it had a couple inches of setiment / sludge type build up in the bottom of the tank . that went in my truck.
within a matter of hours it clogged my filter so bad the truck just slowley came to a stop on the side of the road. foot to the floor it would only idle. removed the filter and beat it on the ground, put it back . the truck would go, but it had no power to speak of. done that several times before i could get to a new filter. put in the new filter, it lasted 2 days before in was loaded up and the truck still had hardley any power. so, five fuel filters later along with dropping the tank and cleaning the foot and both round pick up screens, the truck still runs terrible. took it to a diesel shop they pluged it in to a laptop told me , two cyclinders were not firing. so, thats what leads me to believe i probily got some injector problems.
awhile back i put diesel fuel in my truck from a tank that used to be a home heating oil tank, we was using that old tank to transport fuel. i was told it was a clean tank , ready to go. i asked first, he lied. long story short, it had a couple inches of setiment / sludge type build up in the bottom of the tank . that went in my truck.
within a matter of hours it clogged my filter so bad the truck just slowley came to a stop on the side of the road. foot to the floor it would only idle. removed the filter and beat it on the ground, put it back . the truck would go, but it had no power to speak of. done that several times before i could get to a new filter. put in the new filter, it lasted 2 days before in was loaded up and the truck still had hardley any power. so, five fuel filters later along with dropping the tank and cleaning the foot and both round pick up screens, the truck still runs terrible. took it to a diesel shop they pluged it in to a laptop told me , two cyclinders were not firing. so, thats what leads me to believe i probily got some injector problems.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I think you have clogged nozzles as well. A breakout box with the ability to kill one injector at a time, or pulling the VCs and unplugging one injecor at a time (power off and restart) will be the closest you can come to confirm. I have a high speed camera and I did a vid of the oil coming out of a bad injector. Plenty of oil - bad nozzle. No or little oil - bad poppit valve, loose plate, or injector signal. Good buzz test after little or no oil - bad poppit valve or loose plate. Good buzz and no fire usually means something's going on with the guts in the injector.
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
The fact that you had bad fuel, you addressed the filters and the screens, but what about the inlet screen to the fuel pump? Do you know what your fuel pressure is? Even a quick/cheap temporary gauge plumbed to the fuel bowl drain will help get those numbers if not. You could still have a fuel restriction.