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How do I determine if the Oxygen sensor is defective on my 1993 Eurovan MV (2.5L gas engine)?

Local driving gas mileage is 11 mpg. Highway mileage is 14 mpg. New plugs(Bosch 4 prong) & wires installed in November 2011 but no change in local/hwy mpg. Suspect oxygen sensor but not sure. Would appreciate any suggestions or ideas on how to improve my fuel mileage and determine condition of oxygen sensor. There's only one(1) oxygen sensor on van and it's located BEFORE the catalytic converter. Tire pressure is 35lbs. Using 87-89 octane fuel. You can also send your responses to: bgwathmey@hotmail.net Thanks for your help.

Asked By: - 1/8/2012
Best Answer - Chosen by Asker
You have few small issues going on here. First of all, you have a dirty IDLE AIR CONTROL VALVE and throttle body. That is typical for an older engine. THe IAC is EASILY removed for cleaning. The throttle body is cleaned in plae. These tiems affect, control and fine tune your engine's air/fuel mixture from signals sent... More
Answered By: Robert M - 1/8/2012
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