Oxygen Sensor Tester (Design Idea)

[AN920]

Recently a friend

[audioguru]

My old car passed the emissions test. But when I drove away I floored it which left the testing place filled with too rich black smoke!

[AN920]

Oxygen senser feedback is disabled while engine is still cold or full-throttle operation. Max power requires a rich mixture.

[ante]

My old car passed the emissions test. But when I drove away I floored it which left the testing place filled with too rich black smoke!

You have a diesel, right?  ;D

[audioguru]

You have a diesel, right?  ;D

No, I don't drive a stinky, noisy diesel. It was a '75 Volkswagen Rabbit. It was made for California with a deluxe catalytic converter that lasted only a couple of months. It frequently backfired which broke the catalytic and the mechanics did not know why. Sometimes it made black smoke and other times it backfired.

[ante]

Stinky and noisy diesels?...  Must be a long time since you seen or heard a diesel car, just about when that Rabbit of yours was new! :D

[audioguru]

A neighbour has a new Volvo diesel powered car. It stinks and makes a noisy racket like an old Ford truck. Hey, it doesn't smoke.

[ante]

There is a perfectly logical explanation for this: Volvo is since a few yers completely owned by Ford!  ;D

BTW, for the topic; Bob Blick has something to add about oxygen sensors here:

http://www.bobblick.com/techref/projects/o2sensor/o2sensor.html