Fix to the CAT to get SMOG passed?

[Cavell]

Scotty is like click/clack. They talk about repairs. And why you should buy a 1998 Toyota.

[sciconf]

I got some live stream data while the car was running:

At 2k rpm:

• O2 sensor output voltage-B1S2 = 0.095 - Low?
• O2 sensor output voltage-B1S1 = 0.210 (replaced in 2016)
• Ignition timing advance for #1 cylinder= 33.5 BTDC - high?

At 800 rpm:

• O2 sensor output voltage-B1S2 = 0.015 - Low?
• O2 sensor output voltage-B1S1 = 0.115 (replaced in 2016)
• Ignition timing advance for #1 cylinder= 15 BTDC

manifold absolute pressure sensor = 4.64

When I drive, the downstream O2 sensor fluctuate between 0.02 - 0.88 volts!

Anything obvious?

[kravenscroft1316_165014]

Just a possibility. You may be running a bit on the lean side (caused by an O2 or intake sensor or even a small vacuum leak) or higher than normal combustion chamber temperatures (caused by aggressive timing, cylinder head/piston buildup, incorrect AFR). Or you could just have a bad CAT like just about everyone has said.

[sciconf]

@kravenscroft1316_165014

lean side (caused by an O2 or intake sensor or even a small vacuum leak) or higher than normal combustion chamber temperatures (caused by aggressive timing, cylinder head/piston buildup, incorrect AFR).

Spot on. So:

1. O2 sensor
2. vacuum leak or leak on exhaust
3. higher than normal combustion chamber temperatures (caused by aggressive timing, cylinder head/piston buildup, incorrect AFR).

I just completed:

1. above by following the process below - disconnected the PCV and O2 voltage stopped fluctuating and fell below 0.1 volt - I didn’t bother checking for Rich condition given its NTK part that was replaced in 2016
   https://dannysengineportal.com/o2-oxygen-sensor-function-failure-symptoms-testing
2. I need to test - but the car idles fine. Also hole in the exhaust could also cause this
3. Unlikely since no mods were done to the car.

Also cleaned the MAP sensor.
I found a bad PCV valve - its only 2 yrs old! Replaced it.

[FoDaddy]

@shadowfax

but I wouldn’t let him within 50 feet of my car, much less trust him to tell me how to work on it.

Me neither. He’s shadow banned myself (and I’m certain hundreds others) from commenting on his videos. If you’ve ever take a look a comment section on his videos it’s comprised of roughly 99% of people who don’t know any better, singing his praises. If you post something criticizing him, and I’m not saying you’re running him down like you’re channeling a mid-80’s Ric Flair promo, but more like “Scotty is incorrect here and here’s objective proof as to why I say that…” He’ll shadow-ban you at the drop of a hat. I think the guy knows he gets alot wrong and contradicts himself often., but doesn’t want to let his less-informed fan base in on it.