Join Date: Jun 2010
Location: chapel hill n.c.
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purge valve replacement?
for starters i'm very new to fixing my own discovery II (181k.) i've purchased a shop manual and do consider myself to be very mechanical.
i haul ass every morning on my way to work. in the past month my SES light has showed up twice on the same hill/curve. it eventually would go off after a day or two.
last week it happened again, same curve/hill, but this time it stayed on. then yesterday it flashed a few times like a new code or problem emerged. i haven't noticed any odd changes in performance at high speed or idle. i made the trip to autozone for the codes.
here they are, and i've interpreted them as read in my disc II work shop manual
p1590 abs rough road signal circuit malfunction. possibly due to my fast driving on that aforementioned hill/curve.
p0305 cylinder # 5 misfire. (i did check plug it looked comparable to the others, no gas smell etc..)
p0455 evaporative emission system leak( i looked at the lines on the evaporative emission system, at least the ones i could see. gas cap looked fine.)
p0440 purge valve not sealing ( this may sound stupid, but i took it out and couldn't blow through it from either side.)
p03000 excess emissions detected on more than one cylinder.
what i think is happening: my purge valve is bad (not sealing or stuck open) hence the code (p0440.) this in turn is my large evap emissions leak (p0455) and my excess emissions on more than one cylinder (p0300) and possibly my cylinder misfire (p0305)
i'm thinking that i should order a purge valve (charcoal style) and a gas cap just for sh**ts and giggles. just wanted to know what you guys thought about that, and if there were any other avenues i should explore before wasting my money. thanks.
i didn't address the (p1590, abs rough road signal circuit malfunction) code at all. i'm wondering if there is any correlation between the three amigo lights (TC, HDC, ABS) that have been on for almost a year now.
my mechanic at rover automotive, in durham nc, replaced my ABS shuttle valve and my front right ABS sensor, but the lights magically came back on right when i picked the car up, haha.
i've pulled so much useful info from this site. i really appreciate what you guys are doing. i'll definitely post my results once the repairs are finalized. thanks again.