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Go Back   NissanForums.com :: Nissan Forum > Nissan Models > Sentra, Pulsar, NX, B14 200SX > SR-Series Engines (DE/VE)
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SR-Series Engines (DE/VE) Engine Discussion: G20, 91-94 Sentra SE-R, NX2K, 95-98 200SX SE-R, 98-01 Sentra SE

       
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Old Mar 2nd, 2003, 11:23 PM   #1 (permalink)
NXtremese-r
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Location: Fairfax, VA
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emissions and missing PAIR valve (whatsa PAIR valve do anyway..?)

About a year ago I put on a new hotshot header. Although I do have the opening for the EGR tube, I didn't have an opening for a PAIR valve tube. So, I left it off.
I went to get emissions done almost a month ago and failed, horribly. here are my #'s

at 15 MPH

gas: Limit Reading Result
HC ppm 141 186 Fail
CO% 0.79 0.41 Pass
NO ppm 1088 2362 Fail

At 25 MPH

HC ppm 136 167 Fail
CO % 0.76 0.38 Pass
NO ppm 984 2365 Fail

I just changed my cap and rotor and both the mechanic and I agree that doing that would probably fix the HC problem. No biggie.
I assume the NO problem is due to the lack of a PAIR valve. So, I know I need to hook this back up, somehow. Here are my thoughts.

Idea #1 - make a spacer, about 1.5" with flanges on it, and weld in a piece of copper tubing. put spacer in between secondary and cat, and run a tube up to the PAIR valve.

Idea #2 - Take secondary to a machine shop, and have them weld in a fitting for the PAIR valve tube.

recently, (same weekend that i did the header) i put in a new catco cat, and i have also cleaned my O2 sensor using the torch and heating it up and cleaning the crust off. plug wires (stock size) where put on about a year ago, as well as a new cap and rotor this weekend. so, I'm assuming that cleaning out the EGR tube, hooking the PAIR valve up would help me get there. (what the heck does that thing do anyway..i know its emissions equipment, but still, I have no idea). any other thoughts on this and the new PAIR valve tube placement?

From the main list, Mike Jez said that my EGR is probably not funtional and my car is running rich possibly due to injectors. the running rich part im SURE of. Has anyone turboed there 95+ SE-R and want to get rid of there low mileage injectors?
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'93 NX2k w/work
'06 350Z w/no work
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Old Mar 3rd, 2003, 07:00 AM   #2 (permalink)
Centurion
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http://www.se-r.net/header_exhaust/pair_valve.html
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