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Sudden drop in gas mileage S90-V90

Hey Mike-The vacuum fittings on the hard lines is exactly whay I'm pointing at-don't simply snip the ends off and plug them back on-replace the suckers.
Those fittings can look OK and still leak air-if they are the original fittings I'll bet you will tell a difference once they are renewed-If you have the origanal 02 sensor,go ahead and replace the thing , like Dewfpo said they get lazy over time-I probally need to replace mine now for the second time-damn they are expensive-170 buck at the min. Oh yeah, don't forget that o ring in the vacuum tree.
Hope that helps
Poolman






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