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Forum > Emissions Component > Question

For the 1993 GMC C1500 with a 350ci automatic transmission, did these models use a AIR system?

My father owns a 1993 GMC C1500 4.3L V6 with a 4l60E transmission, which is worn out(over 200,000 miles). I have purchased a salvaged 1993 5.7L from the same model with 40,000 miles and it does not have a AIR system (stock ehaust manifolds do not have air injection tubes) and I wanted to know if any 93 GMC C1500 models used the AIR system.
Answer:

According to our Emission Control Application Guide the original 4.3 liter engine on your 1993 GMC C series truck did have a Air Injection system installed. The new engine your purchased from the salvage yard (5.7 liter 350) does not have an AIS system. Since your doing an engine switch you only need to install the emissions components the new engine has been equipped with by the manufacturer. So in this specific case you no longer need an AIS system, however once the engine change is complete a California state smog referee will need to inspect and smog check your GMC truck. A regular smog station can not perform the initial smog inspection after an engine change. Once the smog check referee office conducts the first smog inspection and ensures the engine replacement was done properly and your truck does not pollute, subsequent smog checks can be conducted at regular smog stations. Call the referees office at (800) 622-7733 to schedule a smog check inspection once the engine change is complete. posted by SmogTips Support

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