Lee Bowman (68.106.61.64) - Sun Apr 20 19:47:13 2008

I have a 1997 Quest GXE, 180, 00 miles, that gets a P0306 code intermittently.

Recent work done: Replaced plugs, wires, rotor and cap. It starts/ runs fine, but gets this code on occasion. I have not been able to re-license it due that reoccurring problem (Arizona strict about codes).

The code is defined as "misfire 1-6" or "misfire cylinder 6". I have also seen it listed as "EGR excessive flow detected" (which one valid?)

I have had the EGR valve off, cleaned it, tested its vacuum function (diaphragm moves when vacuum applied).

Also, I have run compression checks on all cylinders. I believe they were within spec (~ 100 psi?), but perhaps marginal. I will recheck. Also, neither catalytic converter ever replaced. Should I do a temp check to see if high temp is achieved?

So, it seems to run OK, don't hear a misfire, but the code says so. Could it need a valve job (or rings?) Thanks for any comments!

Reply #1 bill (4.157.50.176) - Fri Mar 27 12:07:21 2009

reach behind cylinder head and engine comp . small egr hose is not heatproof and melts and breaks.

Reply #2 manuel bland (65.185.94.129) - Sat Sep 26 20:31:26 2009

my 97 quest has the same code now change plugs and stll have the code and the miss. replaced the hose on the egr it was gone south. put a ring seize in the plug hole and waited still have theproblem. need heop this unit still gets 25 mpg and i have 201 k i beleive this car still has plenty of life.

mayber what I have done may help U does the cyl have compression? mine had 30 lbs before I put a ring seize.

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