A friend has a '99 Ford Ranger throwing a P0401 Insufficient EGR Flow code.
Before we just swap out the valve (they're pretty cheap), anything else to consider/check? I've never seen this particular code before and I know sometimes the codes can be deceiving.
Rubber hoses leading to the DPFE are rotted away. If they aren't, replace the DPFE first.
Fords, 99% of the time, don't need the EGR replaced for EGR codes.
Brian
99 ranger egr is vacuum actuated yes? apply 6" vacuum to see if it opens. if it opens but still doesent flow exhaust gas, there is blockage upstream. it could also be the vacuum line rotted. thats all the help i am
more often than not, its a crap dpfe sensor. iirc, its like $15 from any of the stores. the vacuum operated egr valve is nearly as reliable as a hammer.
Since DPFE has already been mentioned, it's also possible that the passages are gunked up, depending on which engine it is. The 3.8/4.2 engines are horrible for not only EGR gunk, but selective EGR gunk, so when the valve does open it all goes into one or two cylinders (each cylinder has its own passage!) and this causes a light throttle misfire.
Make sure you check the EGR valve with the engine running. Just because the valve opens and closes doesn't mean anything useful is happening.
I was going to say all of the above...
You guys beet me to it. Valve change out would be last thing i'd do.
Get a can of AeroKroil and put the staw in each EGR passage and let it soak in then ream the hole the next day with wire getting bigger each time. Kroil will soften the carbon up real good.
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