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Old 04-28-2021, 05:59 AM   #1
Littleboyhardbody
 
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Default Hardbody 4cyl 1993 wonít pass SMOG HELP!!

Hello guys I need help getting my hardbody to pass a SMOG. Some guy there told me try changing oxygen sensor which is on the way. I hope I can get some advice since I have a basic understanding about cars not really that much of a fault detector. Itís my first car Iím just in high school and I just wanna be able to drive this already, Iím already in love with it. I hope I can pass it so I donít have to sell it and get a Ford Ranger or something not that cool. Wanna be able to keep my JDM truck. It sometimes lowers rpm by itself on idle and starts getting shaky when I like park it but once Iím driving it runs perfect. Could it be linked ? Here is a picture of my SMOG results it was to high on NO (PPM) at 15 mph but everything else is perfect.
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Old 04-28-2021, 10:59 AM   #2
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Hopefully the oxygen sender will fix it, but do a major tune up anyway if overdue. Including the air filter, plugs, wires, ... Keep/take the receipts; some states will pass if a certain dollar threshold is done on repairs.



Check to make sure that no one illegally removed any emissions control equipment.
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Old 04-28-2021, 02:11 PM   #3
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California is pretty strict on emissions. Aren't high NOx emissions like yours usually tied to an EGR fault? Look that up.
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Old 04-29-2021, 04:06 AM   #4
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Bad catalytic converter and a lean fuel mix are the usual culprits. Try advancing the timing and retest.
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Old 05-02-2021, 06:12 PM   #5
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Quote:
Originally Posted by cadillacdude1975 View Post
Bad catalytic converter and a lean fuel mix are the usual culprits. Try advancing the timing and retest.
Engine timing ????? Like the camshaft ?
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Old 05-02-2021, 06:57 PM   #6
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Lugnut is correct about the $ limit.

They sell an additive that is supposed to help you pass smog...also, possibly real gasoline and/or premium.

When you go in, your PU should have a HOT cat...run it in a low gear. When I did my 5spd T.bird, I drove it in 3rd, on the freeway, off the freway and right in to the bay....the car had about 35k on it at the time. It made a big dif in the readings.

Timing, ignition. Theoretically, it shouldnt change, but chaons and belts stretch.

If that doesnt work....sell it in AZ, NV, UT, CO....some place w.no smog tests.
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Old 05-02-2021, 08:22 PM   #7
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Quote:
Originally Posted by Littleboyhardbody View Post
Engine timing ????? Like the camshaft ?
Yes, engine timing... controlled by the dist cap and you'll need a timing light.
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Old 05-03-2021, 01:38 PM   #8
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Quote:
Originally Posted by Stinky View Post
If that doesnt work....sell it in AZ, NV, UT, CO....some place w.no smog tests.

Arizona has absolutely no emissions tests. Except if you live in the counties containing Phoenix and Tucson, whee they test back to 1967 year. Yes, 1967.


But zero safety testing.
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Old 05-03-2021, 03:26 PM   #9
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The EGR is supposed to control NOx emissions.
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