Should the valve STAY open when maintaining revs at 2000-3000rpm, engine at operating temp, trans in park? Mine just opens very slightly , < 1/16", for a second then seems to close again which I verified with a vacuum gauge. It went to full vacuum then dropped back to zero in a second or 2 while maintaining the 2-3k rpm. Going above 3000 doesn't make a difference.
EGR valve
Aug 03, 2012
4 Replies
Probably not.
You don't mention the year, make, model of vehicle or engine type, but these could prove informative:
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where XX = integers 25 through 36, inclusive
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This type of information is readily available and easily locatable by doing a google search.
Thanks, good links but nothing I have read, there or elsewhere, tells me if the valve should stay open as higher rpm's are maintained while in part/ neutral. Car is a 1993 Nissan Altima. See "93 Altima Emissions fail on high Nox..." posted Jul 26. The emission test graphs are also there.
Thanks
as before, your aftermarket cat is 5 years old and it's giving you high HC. those are both big red flags that it's dead.
now, you still need to fix the source of the high HC [low CO2 means you're not getting combustion and therefore have an ignition issue], and the egr issue, but you could probably pass smog with just a new cat. i disabled the egr on my civic and it passes smog just fine.
No it shouldn't. EGR valves will vary depending on operating conditions. They are not a steady state item.
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