Wont pass smog

[tex50]

Had a pretest today. California. Wont pass. Numbers are:
RPM=853 HC=402ppm NO=0 ppm CO=1.83% Co2=11.1% o2=3.3%

Dont know where to start. Had cats put in about 8 months ago. Any advice appreciated.

 

[MAKG]

Those can't possible be complete numbers. Smog Check I counties use two speeds, idle and 2000 RPM. The latter results are quite a bit more useful. So are the SPECS. Those aren't the same for different transmissions on the same model year, even.

Is it a gross polluter?

Regardless, you may be much better off at a shop, as there are quite a few variables here. If you know your way around a voltmeter and understand how oxygen sensors work, you might stand a chance. If that's mumbo jumbo to you, it's not at all a good DIY.

 

[tex50]

Those can't possible be complete numbers. Smog Check I counties use two speeds, idle and 2000 RPM. The latter results are quite a bit more useful. So are the SPECS. Those aren't the same for different transmissions on the same model year, even.

Is it a gross polluter?

Regardless, you may be much better off at a shop, as there are quite a few variables here. If you know your way around a voltmeter and understand how oxygen sensors work, you might stand a chance. If that's mumbo jumbo to you, it's not at all a good DIY.

We just had a smog shop sniff it. Thats where the numbers came from. I am not with the truck its my sons and he's about 2.5 hrs away at college. The numbers were only done at idle and then the tech told him no way it would pass and he should consider selling it as is. Thought that was weird. Specs are 90 ford ranger, 2.9, 4x4, we just put in a used trans and it seemed like the ration was a little higher. Dont know if that can effect it or not. Didnt think so. It is not a gross polluter yet as we didnt do a real smog check. I always do a pre smog 1st. Was going to have a muffler shop check the cats and o2 sensors next but I really dont have a clue. Never had a vehicle that wouldnt pass.

 

[MAKG]

Those numbers indicate it is rich at idle. Might be a miss.

Selling a truck as-is is illegal in California, though quite a lot of jerks try it. You have to smog it to sell it. Try otherwise, and you'll end up in Small Claims, and you'll lose.

Without the sniff specs, you can't know if you're close. I think you're far over.

Though I strongly recommend a shop for this, you can try to find the miss with a cylinder balance test and/or spark plug inspection. IF it's missing (an experienced tech can hear it).

The transmission doesn't change how the vehicle behaves, but autos come with different computers than manuals, and among other things, the idle speeds are different by more than the 10% the test allows.

You're obviously not in LA. Where is the truck? He's at college in August? Berkeley?

 

[tex50]

Those numbers indicate it is rich at idle. Might be a miss.

Selling a truck as-is is illegal in California, though quite a lot of jerks try it. You have to smog it to sell it. Try otherwise, and you'll end up in Small Claims, and you'll lose.

Without the sniff specs, you can't know if you're close. I think you're far over.

Though I strongly recommend a shop for this, you can try to find the miss with a cylinder balance test and/or spark plug inspection. IF it's missing (an experienced tech can hear it).

The transmission doesn't change how the vehicle behaves, but autos come with different computers than manuals, and among other things, the idle speeds are different by more than the 10% the test allows.

You're obviously not in LA. Where is the truck? He's at college in August? Berkeley?[/QUOTE

Those are sniff tests at idle. Will use shop. Trans was changed from 5 speed manual 1990 to 5 speed manual from a later model 4.0 explorer. Truck is in Chico, CA. Chico State started Monday. Thanks for your help.