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Old 12-08-2006, 01:03 PM
pace429 pace429 is offline
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High NOx 1997 vw

Anyone know a fix for high NOx reading. 1997 vw jetta gls 2.0. 459 is max in ca and car is reading 670. HC and Co readings are great.
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Old 12-08-2006, 04:54 PM
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curtis73 curtis73 is offline
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Re: High NOx 1997 vw

check static (initial) timing. If its too far advanced it will make high NOx. Then check the EGR valve. If its not functioning properly it will make it high too.
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Old 12-11-2006, 05:43 PM
abaird abaird is offline
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Re: High NOx 1997 vw

Quote:
Originally Posted by curtis73
check static (initial) timing. If its too far advanced it will make high NOx. Then check the EGR valve. If its not functioning properly it will make it high too.

True statements. Also since NOx is formed at high temps make sure your cooling system is working properly.
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