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Could a bad knock sensor effect emissions?

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Old Jul 10, 2005 | 11:54 PM
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Could a bad knock sensor effect emissions?
I've been told that my knock sensor is loose, hence my knock readings at the 200 mark from just revving it in neutral.

Would this effect emissions from the ECU adjusting the timing?
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Old Jul 11, 2005 | 12:17 AM
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Are you using the PFC? IIRC, the PFC doesn't do anything with the knock reading aside from display it.
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Old Jul 11, 2005 | 12:48 AM
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I'll test with the stock ECU. The smog tests requires a check engine light.
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Old Jul 11, 2005 | 12:56 AM
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Originally Posted by BATMAN
I'll test with the stock ECU. The smog tests requires a check engine light.
The stock ECU does use the Knock Sensor, however I believe it just throws the car into limp mode (as well as CEL).
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Old Jul 11, 2005 | 10:10 AM
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So no ill-effects on emissions?

I assume that limp mode means that it does kills boost/HP?
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Old Jul 11, 2005 | 10:19 AM
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Originally Posted by BATMAN
So no ill-effects on emissions?

I assume that limp mode means that it does kills boost/HP?
Well, I'm not sure what that would do to emissions. I can't imagine it affecting emissions but you never know with these cars! Yep, limp mode does cripple boost/hp.
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Old Jul 11, 2005 | 10:21 AM
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could retard the timing which may cause you to fail a sniff test.. lots of other cars retard timing under excessive knock
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Old Jul 11, 2005 | 10:29 AM
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Yea, that kinda makes sense.

I don't think too many people have experienced a bad knock sensor to failed emissions due to the timing being adjusted........
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