Cutouts would have to go AFTER the rear o2's if there are any. The only way cutouts would screw up an o2 sensor reading is if they were before the sensors.
Chris
Cutouts would have to go AFTER the rear o2's if there are any. The only way cutouts would screw up an o2 sensor reading is if they were before the sensors.
Chris
2009 Silverado, HPTuners, all stock.
Still trying to figure out what to replace.Originally posted by kinjo1977@Feb 17 2005, 11:04 PM
New y-pipe and all?
If I gotta replace that I might as well just rip off this old flowmaster and put on the hooker aerochamber I was wanting.
I hate going into a shop not knowing what SHOULD be getting replaced and getting whatever THEY feel is needed.
Any insight would be appreciated.
FOR ALL YOUR WHEEL, TIRE, AND ACCESSORY NEEDS
CONTACT: EPLEY'S TOUCH OF CLASSIC 1-270-843-6892
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2000 Chevy Silverado 4.8L RCSB: smoked UPD, Flowmaster exhaust, De-screened MAF, Nelson 93 hot tune. Upcoming installs: trans-go shift kit, Eaton posi, billet servo, ported and polished throttle body...Near future: 6.0/4L80E install with 150 wet shot
have you fixed the exhaust leak? is your check engine light on? usually, or from my experiences working at the zone a clogged cat on that year model truck will throw up a PCM code. it is not extremely uncommon for that new of a truck to have a clogged cat. in the past mobth i have seen one 01 and two 02's with clogged cats.
Daily driver: '97 Z-71 reg. cab, electric fans, dual bats, K&N cold air, custom built muffler, and your standard blue light special equip...
My Baby: '67 GMC swb small back glass. 388ci stroker, old school bowtie heads est. 450hp, scat steele crank, eagle H beam rods, and Keith Black pistons, but only pushing 10:1 compression, fed by an Edelbrock 750 carb. THM350 trans. shiftkit w/manual valve body, 2800 stall going out back to some highway 3.42 gears, tubbed.
My connection was leaking there, and I tightened it. That would probably stop your leak there. as for everything else, I don't really know. I would think the cats, or a bananna in the tail pipe (grin).
Good Luck
No more trucks, but this is what I used to have. 2000 GMC Sierra, 6.0L-LQ4, Built 4L60, LS6 Cam, The Other Guys Headers, 3 inch exhaust and 7 chamber flowmaster, 43lb injectors, Nelson Tuning, Drop - 3/4 McGaughys Spindles, Bell Tech Shackles & Hangers. Best time 13.59 @ 106
i had some go bad in less than 16k miles on a new truck (not chevy)...Originally posted by agreif@Feb 18 2005, 08:55 AM
A long shot on an 00, but sometimes clogged cats can give you a hefty power loss too if they are clogged. Woudln't think that would be the case with a truck as new as yours though.
TXsilverado, my basic understanding is that with any type of forced induction the engine wants to breathe, so the cutouts help that, but with a NA engine I am under the same impression you are, performance falls to the floor. Someone will correct me if I am off on this.
Andrew
'13 silverado LT...stock
'11 lt 4x4 z71..tvs1900
'01 gmc twins 6.0 jakes 400 ladder bars w/ coilovers tuned by nelson performance
Alright guys, this is freakin makin me pissed.
It feels like I am towing a boat, but I'm not towing anything.
Or a better comparison would be like I am riding around with my emergeny brake on, but of course it is not.
So is this bigger than an exhaust issue??
I don't think a y-pipe leak could have such a dramatic decrease in power.
Any ideas, cuz I don't believe it is the cats either.
FOR ALL YOUR WHEEL, TIRE, AND ACCESSORY NEEDS
CONTACT: EPLEY'S TOUCH OF CLASSIC 1-270-843-6892
OR TO GET ME PERSONALLY CALL: 1-615-943-6514
2000 Chevy Silverado 4.8L RCSB: smoked UPD, Flowmaster exhaust, De-screened MAF, Nelson 93 hot tune. Upcoming installs: trans-go shift kit, Eaton posi, billet servo, ported and polished throttle body...Near future: 6.0/4L80E install with 150 wet shot
If you're down on power, I would bet it's the cats. Just my opinion but I feel strongly that is it. Your posts earlier didn't mention being down on power all times. Hell, if the cat is behind a bolt on connection, disconnect the pipe and see if the power is restored. It will be loud but you'll see if it's the cat. The only other thing I would think of is the intake tube collapsing down and choking the engine out or a dirty air cleaner but it would have to be really nasty to rob that much power.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I'm gonna have to say cats as well. One of the first signs is a drop in performance. The shaky engine could be the pcm trying to correct something related to the clogged cat.
If you don't have any emission testing, it might be worth it to change them to a high flow cat or gut them.
Mine were only on my truck 3 years and went bad, about 60K miles or so. I did run it hard, but it seemed like a short life for the cats.
keep us posted
Nelson Performance
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'94 Chevy Truck: 8.9 et, 408 twins
Supposing it is the cats, which brand would you recommend?
Are those magnaflows any count?
How about the super-flow spintechs?
FOR ALL YOUR WHEEL, TIRE, AND ACCESSORY NEEDS
CONTACT: EPLEY'S TOUCH OF CLASSIC 1-270-843-6892
OR TO GET ME PERSONALLY CALL: 1-615-943-6514
2000 Chevy Silverado 4.8L RCSB: smoked UPD, Flowmaster exhaust, De-screened MAF, Nelson 93 hot tune. Upcoming installs: trans-go shift kit, Eaton posi, billet servo, ported and polished throttle body...Near future: 6.0/4L80E install with 150 wet shot
if you dont have emissions, cut em outa there. If you do Magnaflow makes good highflow cats.
Chris
2009 Silverado, HPTuners, all stock.
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