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240 DL Emissions

posted by  Andy Hall on  Tue Feb 19 02:04 CST 2002
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Hello:
I have a 1988 Volvo 240 DL with a B-230 F engine.
The car flunked the emission test here in Massachusetts. On the first attempt, it was very low on HC and CO, but slightly high on NOX. I replaced the O2 sensor (which was dead) and air filter (which was filthy) and sparkplugs (which looked fine). When retested, HC and CO were even lower, but NOX was slightly higher. This car does not use an EGR system. Any Ideas on reducing NOX emissions would be appreciated.
Thank you in advance, Andy Hall






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