U can check the temp of the exhaust before and after the cat with a temp gun, if the exhaust is hotter before the cat than it is after that would be a good sign of a clog. And not by a couple of degrees but a noticable difference obviously lol.
U can check the temp of the exhaust before and after the cat with a temp gun, if the exhaust is hotter before the cat than it is after that would be a good sign of a clog. And not by a couple of degrees but a noticable difference obviously lol.
'04 CC 2500 6.0 4L80E, K&N CAI, Magnaflow dual exhaust exit b4 rear wheel, 93 black bear tune
Your post above is what worries me. That is a clear sign of effed up cats. Having an exhaust pipe break off from the muffler will not cause the lethargic performance like you are describing.Originally Posted by 20''strong
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
ok i will check it tomarrow with a temp gun.
Nothing stock...I either broke it or replaced it before I broke it!!
well service light came on today(p0300) so i know it could be o2,plugs,plug wires and still could be cats too.so how do i narrow it down.
Nothing stock...I either broke it or replaced it before I broke it!!
Well for the cat u could still do the temp gun trick. How long has it been since a tune-up? Are those the original o2 sensors? Pull one of the plugs and check the condition. If its been awhile since ur last tune-up now would be a good time for one. But with the symptoms ur were describing last nite i dont think it would be that. Bad plugs and wires would be more like a hesitation and stumbling, not really a loss of power.
'04 CC 2500 6.0 4L80E, K&N CAI, Magnaflow dual exhaust exit b4 rear wheel, 93 black bear tune
alright im taking my truck over to my dads saturday and putting it on the hoist.im going to do the temp check on each down pipe and see what its doing.also my buddy told me to try two things also,he said drill 1/8 hole before and after the cats and check the vacuum difference between the two.and also pull out the o2 sensor before the cat and that will releive a little bit of the pressure and the idle should change alittle.one question i have is will leaving out the rear o2's hurt anything,i dont want to replace the cats since im getting lt's and ory when it warms up.
Nothing stock...I either broke it or replaced it before I broke it!!
It's a long shot, but try cleaning the MAF. Mine did the same thing and after every other thing I tried, the maf fixed it all. No cel for it or anything.
'00 Silverado 4.8L (Gone)
'11 Silverado 4.8L
Did u figure out what was wrong?
'04 CC 2500 6.0 4L80E, K&N CAI, Magnaflow dual exhaust exit b4 rear wheel, 93 black bear tune
my sons been sick so i didnt have time,but friday im going to.i went ahead and got plugs and wires since they never been changed.i did clean my maf but didnt work.i will update saturday.can anyone tell me how they gutted their cats,i dont see how its posible while still on the y pipe.did they have to be cut from the y and reconected.
Nothing stock...I either broke it or replaced it before I broke it!!
so i finally had a chance to work on my truck and the problem is still there. so far i have replaced plugs and plug wires,cleaned tb and maf and filter,replaced front 02 sensors(have some good ones laying aroun so gave it a shot).ive been getting random/multiple misfires,bank 1 lean and a maf code.i have looked every with a stethascope for vacuum leaks.im stumped and hate to take it to a stealership.
Nothing stock...I either broke it or replaced it before I broke it!!
Posting Permissions
Reply With Quote
