switch mechanics and it was brought to my attention that my car does not have
an air pump. Can someone explain to me what is the purpose of the air pump <<
The air pump is activated by the computer for a minute or two on cold startup
to blow air into the exhaust ahead of the oxygen sensor to trick it into
sending a lean signal to the computer to cause it to enrich the mixture for
warmup. Like a choke function. Then it turns off.
425 White Horse Pike
The Air Pump is used to add air at the exhaust ports to aid the in the
oxidation of CO and HC to meet emissions and also heat the cat.
It has nothng to do with tricking 02 sensor . The ECU will not let the pump
circuit come on unless it is in open loop.
Once the system goes into 02 sensor closed loop, the pump circuit is done..
Damn! $1200 for an air pump? $441 is the lowest price I have seen for quick
search at Mr. Auto Parts.
Air pump is used only when engine is cold to supply extra air while idling.
It is part of emission control... but rarely used device... only when engine
is cold first thing in the morning.
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