2000 Ford Explorer Q&A
2000 Ford Explorer Question: poor running
Check for a vacuum leaks, especially at or near those 2 cylinders. - Bret Bodas
Disconnect the EGR valve and plug the vacuum line. This will most likely correct the problem, but you will live with the "check engine" light. The "running lean" is caused by the EGR gases all traveling to that cylinder cuz the others are blocked. - ltcmustang
It's not the EGR valve; if it was, the code would read EGR insufficient flow. Check under the air intake cover. There is a small piece of 90degree vacuum hose just under the throttle body on the left side of the block (if you're looking at the motor) just behind the camshaft sensor ; maybe 2 1/2-3in long. My mechanic told me these are really bad on the 4.0 about dry rotting and splitting. My 2001 explorer sport did the same thing, and was loping horribly, he popped the hood heard a hiss, put his thumb over the hole on the hose, and the engine RPMs rose and the loping stopped; as soon as he moved his thumb it started again, and yes I had a bank 1 and 2 lean, and multiple cylinder misfire code as well. You will have to get it from a ford dealer ship b/c the parts houses don't have the right size hose you need. Take it off and to the dealership. It should run about $8-$10. HOPE THAT HELPS! - FarTidwell
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