Last week my air pump was running meaning that it was spinning. Today, I took a gander and it's not spinning while the motor is running. I recall a conversation I had a few weeks ago with a Ferrari mech at Auto Gallery that there is a piece on the end of the cam shaft that breaks when the pump siezes. Could the have broken?
Not really but I live in Ca so I have too I was just working on the car. I took the belt off the airpump as a "just in case" After I did that, I noticed that the pully was rotating and then upon futher inspection, I noticed that there was a pin that was hanging off the pully. I stopped the motor and pushed the pin back in and then it started rotating again. It seems that this pin worked it's wasy loose causing the airpump belt to stop spinning. Part #66 and #45 shown on the pic. What's the deal with this? Image Unavailable, Please Login
If that's all it does, how does that help anything? It still puts out the same amount of hydrocarbons, just less concentrated with each exhaust stroke. I am just guessing, though.
The air injected in the hot exhaust adds the additional oxygen to allow for the excess hydrocarbons to be burned up. This reduces the HC amount prior to the catalytic converter or thermal reactor on the earlier 308. Burning the leftover HC significantly increases the temperature of the exhaust. Richard
It's more than just adding volume to reduce the HC concentration -- the O2 in the added air chemically reacts with the unburned HC to form more CO2 and H20 (and actually reduces the total mass amount of HC coming out of the tailpipe). Without the added air, a catalytic converter will age/foul more quickly -- especially on a carbed set-up and to a somewhat lesser degree on a non-Lambda injected set-up like an '83 QV. In the warm-running, closed-loop mode on the later Lambda-equipped cars, they run so lean that they don't need the extra air, but during cold-running even those need the extra air added to keep the cat healthy and effective.
That had to be a terrible way to do it back then. It seems obvious that an engine needs to be designed with emissions in mind to begin with instead of designing emission controls around an engine as an afterthought.
