poor running on 2000 Ford Explorer

engine running poorly, codes say misfire on cyl 1 and 2. also bank 2 lean. changed fuel injectors,coils,plugs and wires still the same any ideas???

by in Aberdeen, SD on February 15, 2009
3 answers 3 comments
ANSWER by on February 16, 2009
Check for a vacuum leaks, especially at or near those 2 cylinders.
COMMENT by on May 24, 2011
what if you replaced that hose and the engine still running poorly but backfires after running for roughly 10 minutes. one of my cylinders isnt working and i replaced everything he did.
ANSWER by on February 18, 2009
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.
COMMENT by on February 18, 2009
i will indeed look for leaks and will disconnect the egr and see what happens. i appreciate the help
ANSWER by on November 19, 2009
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!
COMMENT by on May 16, 2011
fartidwell, is that the same for a 2000 ranger i have the same problem but i would have to take off in take to get to the sensor becasue its under the coil pack on mine
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