2jzge Not passing emissions in a SC300

[SupraMario]

So my cousin has a stock SC300 with the 2jz, it is completely stock except for the stock exhaust has been removed and replaced with just straight pipes.

HC: Reading is 590 PPM and the limit is 220.
CO: Reading is 0.33 and 1.2 is the limit.
CO2: Reading is 13.9 and Limit is N/A ( I have no Idea why they don't have a limit on the CO2)

I was telling him to put the stock exhaust back on the car, we have the stock exhaust BTW.

So any suggestions to fix this issue quickly?

 

[Altezza576]

You need a catalytic Converter.... straight pipe will not ever pass.

 

[SupraMario]

You need a catalytic Converter.... straight pipe will not ever pass.

It has the stock cats. They removed the stock exhaust only, not the cats.

 

[RazoE]

then the exhaust won't matter..

make sure his vacuum lines are hooked up the right way, they're not brittle, and make sure he drives the car for around 20 minutes on the freeway, you want the cat to be hot...

 

[Altezza576]

Make sure your O2 sensor is actually functioning and putting the car in closed loop.

 

[4U2QUIK]

time to ditch the 2j and put a newer sc400 engine in it. j/k

 

[jetjock]

While the comment about the O2 sensor is normally good advice it's highly unlikely the CO would be where it is if the engine wasn't in closed loop.

Mario: there's no limit on CO2 because it's not a regulated pollutant. It's a "good" gas, an indicator of combustion efficiency. The higher the better. His is yet another indication the engine is in fuel control...

 

[SupraMario]

While the comment about the O2 sensor is normally good advice it's highly unlikely the CO would be where it is if the engine wasn't in closed loop.

Mario: there's no limit on CO2 because it's not a regulated pollutant. It's a "good" gas, an indicator of combustion efficiency. The higher the better. His is yet another indication the engine is in fuel control...

Meaning?? What do you mean the engine is in fuel control?

We will check the vacuum lines tomorrow.

 

[jetjock]

Meaning closed loop. And a vacuum leak isn't going to be the cause of his problem...

 

[SupraMario]

Meaning closed loop. And a vacuum leak isn't going to be the cause of his problem...

So plugs? Wires? Coil? Or does the ECU just need a reset?

 

[geartech]

Looks like the cats appear to be there but are either hollowed out or no longer functioning.
look at the cats. Depending on mileage they may just be dead. they were only supposed to last 80k to 100k miles. Many make it further than that.
If you want to test them take a wide band and read the a/f before and after the cat. after should be much leaner.

 

[SupraMario]

Looks like the cats appear to be there but are either hollowed out or no longer functioning.
look at the cats. Depending on mileage they may just be dead. they were only supposed to last 80k to 100k miles. Many make it further than that.
If you want to test them take a wide band and read the a/f before and after the cat. after should be much leaner.

Hmm...well the car does have 160K+ Miles on it.

 

[geartech]

If you have access to a wideband then checking shouldn't be a problem. You could drop the exh after the cats and look inside to see if the guts are still there.
Just remember cats and o2 sensors are wear/maint. items. they should be replaced at 80-100k depending on the manufacture. Not that any one really does it until they notice a problem.

 

[Evilempire1.3JZ-GTE]

If NOX fails then your to lean or advanced
If HC & CO is high then you have to much fuel or its running retarded on timing.

I think its your Cat & O2 also nevermind other information when HC & CO split meaning one fails and the other doesnt it is very likely to be your Cat & O2.

If you had other issues like NOX / HC CO then its engine issues AFRs timming etc.