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i had the same problem when i smogged my truck and it is probaly two things the extenison connector to a little sensor on the passenger side fender wall next to the fire wall. just follow the vacuum lines from the egr valve. all it is an 2 inche extenison to a connector that can go bad from time to time and you really don't need it. just plug the sensor back in.

the egr position valve sensor. the little plastic thing connect to the outside of the egr valve on the of the enginge to the rear. this part will run you around $30 - $45 dollars

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โˆ™ 2015-07-14 15:04:45
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Q: Why would a 1990 Ford Ranger 2.3L 5 speed with 106667 miles check engine light come on when driving at low rpms but go off at higher rpms?
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