Quote:
Originally Posted by Estoril
I found a secondhand replacement pump from a 4.4 with OEM number 11721437910, does this fit a 4.6 model?
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Check it with RealOEM to make sure.
I have actually been driving for a few weeks with my secondary air pump disconnected for a few weeks, and the only issue is that it throws a check engine light (my car is a 3.0 though). When it is working, the DME injects extra fuel which is combusted in the exhaust manifold in order to heat up the cat quickly. The DME knows the secondary air isn't working, and doesn't inject that extra fuel (with the downside that the cat doesn't heat up as quickly). This is no big deal and actually saves you a bit of gas, but if you have to get smogged it will not pass. (I broke the vacuum line that actuates the valve in the exhaust manifold, which is why mine isn't working.)