Stinky Smell At WOT On '97 LSC

Guess il be doing the o2 :q:q:q:q, Advance auto running 30 off 100 right now plus my brother works at a local car place. So il have to see whats better...
 
FML new o2 sensors did NOT work.

Just put them on this weekend. Also wasn't very friendly of a job lol
 
Removed 3rd cat and replaced with H-Pipe. No more stink!! Yay!! :)

And get this, when I dropped it off at the shop, the computer said the average economy was 17.4mpg. After driving it home 40 miles with the A/C on and multiple WOT's just to hear the mufflers scream, it was at 17.9 when I pulled into my driveway.
 
thaywood said:
Removed 3rd cat and replaced with H-Pipe. No more stink!! Yay!! :)

And get this, when I dropped it off at the shop, the computer said the average economy was 17.4mpg. After driving it home 40 miles with the A/C on and multiple WOT's just to hear the mufflers scream, it was at 17.9 when I pulled into my driveway.
Click to expand...

I already have an X pipe on mine, not sure if the third cat/res is on or not tho...
 
You really need to find out why it's running rich and making the cats work so hard, if it's only once in a while (esp after wot only) it probably is fine...
It could be caused by O2 sensors, bad fuel pressure regulator, a bad MAF, a leaky injector, or elsewhere...
 
thaywood said:
Removed 3rd cat and replaced with H-Pipe. No more stink!! Yay!! :)

And get this, when I dropped it off at the shop, the computer said the average economy was 17.4mpg. After driving it home 40 miles with the A/C on and multiple WOT's just to hear the mufflers scream, it was at 17.9 when I pulled into my driveway.
Click to expand...

Mine are not there either, its only after WOT...so fk it
 
Nice installation. It looks stock. Also, nice deep muscular tone. Do you notice any drone in the interior? I have a set of Thrush tube mufflers on my 82 diesel Suburban and it is crazy loud. Full throttle down the street at 4000 rpm's will set off all the car alarms. It is also very loud inside which get's tiring on long trips. I use a set of noise cancelling headphones while driving at times to enjoy some quietness.
 
Icarus said:
You really need to find out why it's running rich and making the cats work so hard, if it's only once in a while (esp after wot only) it probably is fine...
It could be caused by O2 sensors, bad fuel pressure regulator, a bad MAF, a leaky injector, or elsewhere...
Click to expand...

It doesn't do it anymore since removal of the 3rd cat. Before, it only smelled bad after a WOT run like passing somebody. The cats have 177K miles on them. I'm surprised they're not completely stopped up. But the biggest surprise was the gas mileage increase. It is truely amazing what a difference it made in the entire character of the car.
 
Here's my H-Pipe.

h-pipe.jpg

Ain't it purdy?:)

h-pipe.jpg
 
thaywood said:
It doesn't do it anymore since removal of the 3rd cat. Before, it only smelled bad after a WOT run like passing somebody. The cats have 177K miles on them. I'm surprised they're not completely stopped up. But the biggest surprise was the gas mileage increase. It is truely amazing what a difference it made in the entire character of the car.
Click to expand...

They were probably partially stopped up. This may be why you're getting better fuel economy. With the new exhaust setup, what effect does it have on interior noise?
 
Of course it won't smell without them, theres nothing there. It's still running rich most likely though...
 
Ed Hall said:
They were probably partially stopped up. This may be why you're getting better fuel economy. With the new exhaust setup, what effect does it have on interior noise?
Click to expand...


It's loud.:D Really, not bad at steady highway speeds, though. But at takeoff and any time you give it gas to speed up, it gets pretty loud. At low speeds around town there is a drone. Not anoying, but actually quite pleasant. I like to hear my engine.
 
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