![]() The flapper valve on the air cleaner is both vacuum and thermostatically sprung for control. The hot air stove is only there to reduce the effects and time it takes to transition through cold start. The dirtiest part of emissions and highest internal wear of engine parts is during the cold start enrichment phase (choke). The hot air inlet off the exhaust into the intake is only there to allow the use of a leaner mixture on cold starting. You might not get that far if this is a different test station that you're going to. I can’t say which you'll encounter, apparently the previous owner got this past the equipment part and it passes the emissions part. On the other hand the tester may look under the hood, see the missing equipment and stop the test right there till you replace the missing equipment. It is possible to pass the second one with parts missing such as the hot air stove to the air cleaner. Two, will be passing the emissions test for gasses present in the exhaust. But the smog police may say otherwise.Ĭlick to expand.You always have two battles in California one, will be the equipment that should be there. Performance-wise, you can go w/o the thermo air cleaner assembly, providing the flap is open while the engine is running, and provided you're not driving in arctic conditions. If the flapper is always closed when connected to the vacuum port (engine running), disconnect it to leave the flapper open. By disconnecting the vacuum line to it w/the engine running, then reconnecting it you can see if it's working at all. ![]() If you look at how yours is working, you will see it is either always open or always closed with the engine running (and vacuum going to the vacuum motor on the snorkel). Usually the default setting (no vacuum applied) would be to have the flap open to allow cold air into the carb, but that's not always the case. Generally, the vacuum source should be controlled by a temperature activated vacuum port, so the flap is closed during warm up (allowing warmed air to the carb) and open after it's warm. ![]() But if you fill in the blanks (what type/make/year of the vehicle, engine size, etc.) and maybe a photo or two, we might be able to help.īut if you don't have a place on the exhaust manifold to pick up the heated air, the air filter housing might not even be original to that vehicle. That said, I'm no authority on CA emissions- or emissions in general. In CA I wouldn't be surprised if you needed to have it to pass. ![]()
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