High NO ppm fail on emission test 91 accord
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Junior Member
Joined: Jul 2008
Posts: 32
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From: Toronto, ONTARIO, Canada
High NO ppm fail on emission test 91 accord
Hey guys I just did my emission test and I failed on high NO ppm but, the CO and HC are low. What should I do? I already tried cleaning out the EGR valve and, in the process of getting the spark plugs changed. Possibly it's the O2 sensor? 
Thread Starter
Junior Member
Joined: Jul 2008
Posts: 32
Likes: 0
From: Toronto, ONTARIO, Canada
Re: High NO ppm fail on emission test 91 accord (dtapia)
"does the egr hold and stall or almost when vacuum is applied ?" - I don't understand the vacuum part..
I know the vacuum hose that connects to the EGR..
I know the vacuum hose that connects to the EGR..
Honda-Tech Member
Joined: Mar 2007
Posts: 1,296
Likes: 3
From: Fresno, ca, usa
Re: High NO ppm fail on emission test 91 accord (mikeszutu)
if you use a vacuum gauge and apply vacuum to it while it is running it should almost stall or completely stall if so then egr ports are not plugged up.on the otehr hand if it does not stall with the vacuum applied them time to drill out the plugs and do some cleaning. but first check that.
drop me a email and i will send you the test procedure.
drop me a email and i will send you the test procedure.
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