1994 GS300 failed smog emissions testing. The car does not belong to me, it's my grandpa's. I do not know when the last time maintenance was performed. He doesn't speak any English so the smog tech was unable to tell him what might be wrong with it. Tried calling the smog tech, but the shop was closed yesterday. I have posted a picture of the smog sheet below for anyone that can shed some light on this.

 

Bump anybody?

 

Nobody knows anything about smog? Need to get this fixed asap!

 

Check vacuum lines for leaks and get a tune-up preformed on the car. Mainly spark plugs and filters. Any tiny leak can cause a fail. If that fails, then have the fuel system cleaned and injectors cleaned also. And i mean professionally, not the putinyourtankstufffromautozone cleaned.

 

What part of the test did it fail? I cant se the pic in my phone.

 

your co and your hc is high
id change the oil, spark plugs,air filter,radiator flush and run fresh gas
its looks like the car is either running hot or needs an oil really bad(hc problem)
i think you may have a vacuum leak or contaminated maf or unplugged ect/other sensor(co problem)
it could be a few things, just check the basics and go from there

 

Make sure your egr system is working.

 

Also, why did they dyno it? Who else had there car dyno'd?

I always get a 2 speed idle test because the gs300 has non-disingaugable tracton and will go into limp mode.

 

Your car is running too rich. I dont remember the GE motor, but check your timing. And every 1st gen is able to go on the dyno. The traction control if it has it, can easily be disengaged.

 

CO Failure is the result of an excessively rich air fuel mixture. The most common causes:
- Defective Oxygen Sensor
- Inoperative Air Injection System (if equipped)
- Leaking or defective Fuel Injectors
- Restricted air filter (especially if high CO is present only at high RPM)
- Vacuum leaks resulting in improper MAP sensor operation
- Defective air mass or air flow sensor
- Malfunctioning fuel evaporation system or purge valve
- Defective Catalytic Converter
- Defective thermostat (cooling system), thermostat stuck open
- Oil contaminated with fuel, excessive miles between oil changes

HC Failure is the result of incomplete combustion. Any item that causes incomplete combustion can result in high HC. The most common causes are:
- Worn spark plugs
- Defective spark plug wires
- Worn distributor cap and/or rotor
- Improper ignition timing, usually over advanced
- Vacuum leaks
- Engine mechanical failure, low compression, worn valves, excessive oil consumption

 

Excellent info, thanks siknezz408.