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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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Wiki User
2015-07-14 15:04:45
2015-07-14 15:04:45

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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I would assume the 2.3 L SOHC 4 cylinder was the stock engine , with the 2.9 L V6 being optional or included as part of a higher trim level

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Driving on lower RPM's will reward you with higher gas mileage in addition to putting less wear on the engine. So, low RPM will be cheaper in the long run.

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The timing is set higher than recommended. It needs to be retarded.

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Engine Brake: One way to reduce speed by shift down the gear from Higher to Lower (Eg. Driving with 120 km/h with 5th gear, by turning to Engine Brake it reduce to 4th gear that make the speed is reduced) It's very helpful when driving with high speed.

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