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Pokerface77
Novice
Jul 19, 2012, 2:50 PM
Post #1 of 4
(2748 views)
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NO Power 04 GMC 4.3
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04 GMC Silverado 4-3 v6 182000 Check engine light on. P0430 below threshold bank 2, P0300 Random/Multiple, P0101 MAF/VAF (latest code to show). Began with just the P0430. Truck was running fine so I just put it in the back of my mind. After about 2 wks, light went out. Now, complete lack of power, 0-60 about 30 sec. If I force it, it sounds very throaty like it's in the intake shorkel. I'm suspecting clogged cat bank 2 with such a loss of power. Idles just fine. This thing normally has plenty of power. Can easily tow my 24 travel trailer all day long. Help please.
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nickwarner
Veteran
/ Moderator
Jul 19, 2012, 3:14 PM
Post #2 of 4
(2738 views)
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Re: NO Power 04 GMC 4.3
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If you don't have a way to test the exhaust backpressure, hook up a vacuum gauge and run at idle. Now rev to 2500-3000rpm. If vacuum drops near zero it almost certainly points to a bad cat.
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Pokerface77
Novice
Jul 19, 2012, 7:20 PM
Post #3 of 4
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Re: NO Power 04 GMC 4.3
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Exactly right. I just had to confirm my suspecions before taking the leap. Checked, then drilled a few relief holes through the innerds of the cat. Power is back. Now to get a cat replaced. Thanks for the confirmation.
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nickwarner
Veteran
/ Moderator
Jul 20, 2012, 5:42 PM
Post #4 of 4
(2684 views)
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Re: NO Power 04 GMC 4.3
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Thanks for posting the fix and glad you want to diagnose instead of waste money. We're always here for the next repair.
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