Cylinder contribution test
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Posting Guru
Joined: Aug 2007
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From: Cato Arkansas
Cylinder contribution test
I got my scan gauge back and working and tried a contribution test and I'm getting a po113 and po603 code i looked up the code and
The po113 is a air intake code and the po603 is a kam code but I got no Idea what they mean. Any ideas? Thanks
The po113 is a air intake code and the po603 is a kam code but I got no Idea what they mean. Any ideas? Thanks
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
You can unplug a lot of things...the PCM still expects to see that sensor hence the code. Most folks leave the sensor plugged in and tie it off somewhere near the air filter element...
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Posting Guru
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From: Cato Arkansas
Ok so been doing some reading and from what I have discovered is the 94-97 contribution test you can hear and feel the cylinders cut out. On the. 99 and up its a silent test. I'm use to wrenching on the obs so that why I figured the test didn't work. I find it odd the a truck with 378k miles passed both the buzz and cct.
Postmaster
Joined: Apr 2012
Posts: 2,613
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From: North Georgia
Its not odd at all. These engines are well known for running like swiss watches for 500+ k miles.
Mine is at 414k miles still ticking along with 4 of her factory injectors. Granted... its time to replace them... but she starts up in 30* mornings like a champ.
Mine is at 414k miles still ticking along with 4 of her factory injectors. Granted... its time to replace them... but she starts up in 30* mornings like a champ.
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Butt-Head
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Why do you say that?
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Posting Guru
Joined: Aug 2007
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From: Cato Arkansas
I just figured that the injectors would not be balanced with that many miles. I was gonna use a failed comtribution test to talk myself into some sticks but that didn't work so now I gotta find another way to justify them
Cargo Master
Joined: Jan 2009
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From: OKC, OK
Ok so been doing some reading and from what I have discovered is the 94-97 contribution test you can hear and feel the cylinders cut out. On the. 99 and up its a silent test. I'm use to wrenching on the obs so that why I figured the test didn't work. I find it odd the a truck with 378k miles passed both the buzz and cct.
Butt-Head
Joined: Apr 2004
Posts: 9,415
Likes: 2,911
From: Reed Point, MT
..because neither a "buzz test" or "contribution test" have a whole lot to do with how "balanced" the injectors are.
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