1997 Ranger, 2.3L Code 0401 - Ranger-Forums - The Ultimate Ford Ranger Resource


SOHC - 2.3L & 2.5L Lima Engines Discussions and Topics specific to the Lima 4 cylinder engines

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Old 05-01-2013
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Join Date: May 2013
Location: Houston, TX
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1997 Ranger, 2.3L Code 0401

I have changed out the EGR, EVR, DPFE, all the associated vacuum hoses.

Intake Manifold => EVR vacuum hose,
EVR => EGR vacuum hose,
EGR Tube => DPFE hoses.

The only thing I haven't replaced is the EGR tube.

I get the following reading on the DPFE... from .7V @ 0% to 1.9V @ 90%. From what I have read, I should be getting closer to 5V @ 90%. Not sure why the readings from the Upstream and Downstream vary so little.

Does anyone have any ideas on what to look at next?
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Old 05-13-2013
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Join Date: May 2013
Location: Fayetteville
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I have been told that clogged ports inside the throttle body will cause this issue and that cleaning the throttle body may solve the issue.
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