test blocked cat
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Veteran
Joined: Feb 2015
Posts: 315
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From: CA
test blocked cat
so i bought my truck a little over a year ago and i ended up replacing the cat within a month cause it was blocked as hell. Anyway in the last few months ive replaced the plenum and the 02s and a mess of over things. My question is, is it possible that i clogged the new cat in a year since i didnt fix the plenum until recently. Sometimes i get a vibrating metal sound when i start it and for some reason as of late i have absolutely no power going up hills if im not in overdrive. IF the truck is in last gear it wont going any faster then 50ish or so no matter how much i smash the pedal unless it goes into overdrive. Is there anything i can run through the gas tank or system to maybe clean out a newer cat
Last edited by zildjian3707; Apr 12, 2015 at 03:36 PM.
Grand Champion
Joined: Apr 2010
Posts: 5,011
Likes: 6
From: Meeker, CO
Are you sure about it being in/out of overdrive? It's usually the other way around: Won't accelerate or pull hills worth a damn until shifting out of overdrive.
Anyway, it is certainly possible that the blown plenum gasket killed the cat in a year. A (back) pressure test will tell the story.
Anyway, it is certainly possible that the blown plenum gasket killed the cat in a year. A (back) pressure test will tell the story.
Administrator
Joined: Apr 2010
Posts: 87,376
Likes: 4,209
From: Clayton MI
That's actually fairly normal. 
It should hold speed in O/D, on cruise, up fairly mild hills, but, anything steeper, and it will either struggle, and refuse to downshift, or, it will downshift, and maintain speed easily.
It should hold speed in O/D, on cruise, up fairly mild hills, but, anything steeper, and it will either struggle, and refuse to downshift, or, it will downshift, and maintain speed easily.
Grand Champion
Joined: Apr 2010
Posts: 5,011
Likes: 6
From: Meeker, CO
It's not supposed to have power in overdrive. Overdrive is for flatland unladen cruising only. When you need to make power, mash the button to get out of overdrive, then mash the pedal. 'Tis just the nature of the beast. Where I live, I don't get to use overdrive at all until I'm at least 40 miles from home.
That said, check out that cat with a pressure test. If it's fouled, it's time to get it out of there before it causes overheating and failure of your expensive cylinder heads. Oh, and there's no magic chemical cure for a fouled catalytic converter.
That said, check out that cat with a pressure test. If it's fouled, it's time to get it out of there before it causes overheating and failure of your expensive cylinder heads. Oh, and there's no magic chemical cure for a fouled catalytic converter.
Administrator
Joined: Apr 2010
Posts: 87,376
Likes: 4,209
From: Clayton MI
It's not supposed to have power in overdrive. Overdrive is for flatland unladen cruising only. When you need to make power, mash the button to get out of overdrive, then mash the pedal. 'Tis just the nature of the beast. Where I live, I don't get to use overdrive at all until I'm at least 40 miles from home.
That said, check out that cat with a pressure test. If it's fouled, it's time to get it out of there before it causes overheating and failure of your expensive cylinder heads. Oh, and there's no magic chemical cure for a fouled catalytic converter.
That said, check out that cat with a pressure test. If it's fouled, it's time to get it out of there before it causes overheating and failure of your expensive cylinder heads. Oh, and there's no magic chemical cure for a fouled catalytic converter.
Grand Champion
Joined: Apr 2010
Posts: 5,011
Likes: 6
From: Meeker, CO
DuPont Red Cross Spinner Bait will work but it's tough on the paint. 
