plugging air ports on 75 heads, I promise I did run a search? Options

[brant]

I know this has been covered repeatedly..
I guess I'm not good at searching...

1) I'm looking for btdt ideas on plugging the air ports on the 75 2.0 motor...

2) also would love to know if I need to readjust the mixture or do anything to the FI after I plug these.

thanks in advance
brant

[lapuwali]

No, as the air is pumped into the exhaust stream. The idea was the promote more oxidation of any leftover HCs in the exhaust pipe itself. It also assisted in the early style "oxidizing" catalyst used in those days. If you've since swapped to a newer catalytic convertor, then it will be a three-way "reduction" catalyst. If you've removed the cat altogether...

According to at least one emissions engineer I know (guy inside Ford), the air pumps were only useful if the HC level was really high, which should only happen if your mixture was way off, or you where misfiring from ignition problems. In other words, the air pump was only useful if your car needed a tune-up or had some other problem. If your car was in good nick, the air pump was a pretty useless appendage. With a modern catalytic convertor, it's genuinely useless, as the cat by itself will clean up the exhaust tremendously.