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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   1989 toyota pickup 3.0 crank no start I have a 1989 toyota pickup 3.0 crank no...   Strut spring orientation and strut mount tension nut 2017 Nissan rogue awd 2.5 L Put in Monro...   Transmission stuck in part, I have tried everything So I'm working on my elderly fathers 201...   2017 dodge journey LED headlights on/off randomly Year of vehicle 2017 Make of vehicle dod...   Kia Soul starter replacement issues! Okay so my car is a 2010 Kia soul 2.0 en...   Please Help - Knock sound & engine fail Hi all, Hoping to get some insight and ...   multiple warning lights 2013 GMC Terrain 130,000 miles 4 cylinde...   03 alero no low speed blower Good day everyone, I have a 2003 Olds a...   04 Chevy 2500hd tail light issues Help!!! I have changed my combo switch...   1999 Grand Caravan Sport not starting. Hi. I'm new here. I hope someone can hel...

NO Power 04 GMC 4.3 Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes Pokerface77 Novice Jul 19, 2012, 2:50 PM Post #1 of 4 (2870 views) NO Power 04 GMC 4.3 Sign In 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. nickwarner Veteran / Moderator Jul 19, 2012, 3:14 PM Post #2 of 4 (2860 views) Re: NO Power 04 GMC 4.3 Sign In 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. Pokerface77 Novice Jul 19, 2012, 7:20 PM Post #3 of 4 (2824 views) Re: NO Power 04 GMC 4.3 Sign In 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. nickwarner Veteran / Moderator Jul 20, 2012, 5:42 PM Post #4 of 4 (2806 views) Re: NO Power 04 GMC 4.3 Sign In Thanks for posting the fix and glad you want to diagnose instead of waste money. We're always here for the next repair.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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