worangejuice

I dont have any CEL on......googling.....nothing.....what
NVM found it..........thanks
http://forums.nicoclub.com/1991-1994...s-t253912.html

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worangejuice

tried to test my O2 sensor last night by using the self check II method, and the red light in the ecu was not on at all and the CEL wasn’t blinking…did multiple tries, rotate,2 sec.,rotate…..
strange

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LovetoSlide

Seriously smogging it under the table would be so much easier....

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worangejuice

so i gave it some throttle and the egr doesnt lift, is this cause the egr-bpt is dead?

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milto0n

You might have to rip the throttle a little bit but to my knowledge it should lift. Check your vacuum hoses to make sure they are corrected. Look at these diagrams and then look at them again. Get really familiar with these pictures, hell bring your computer outside and make sure they are all there and are going where they should be. Remove hoses from underneath the throttle body and blow in them to see whats going where.

If possible, manually apply vacuum to the EGR valve and see if that causes it to lift. If it doesn't then the valve is your problem. However by the sound of your missing components I am willing to bet that these vacuum hoses are not going where they are supposed to.

240sx EGR tutorial : 240SX Technical Forum

milto0n

Here's a better link. I used this one when I removed my turbo set up to pass smog.

1991-1993 240sx: Vacuum line identifying pictures : 240sx General Discussion

worangejuice

Thanks man, Im thinking its the BPT at this point,
1. not being hooked up
2. hooked up,nox goes down
3. get a good working one in to work with EGR
4. NOX has gone down each time with seafoaming and maintenance cleaning

dreading another part purchased on BPT valve and no pass..........guh

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lethanh93

Hi sorry that this is late but I have the same problem, did your solution work for you?

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VertTwins

You guys crack me up with the cat thing.."its old, its got lots of miles on it. replace it"...lol

I have 2 of these cars 92 and 93, one has 210k and the other has 199k miles on it. both have the original cats and both pass as clean if not a bit cleaner then a lot of the 2005 cars I have smogged. Its about proper maint. Cat convertors have no moving parts, they are just metal. they go bad when a car is poorly maintained either run too lean and over heat the cat till it melts or the car is running super rich and plugs it up with carbon deposits. the later may be able to be cleaned up.

First off dude you needed to address the modified item (tamper) listed on the inspection sheet. Using a lambda calculator at 15mph your are running at 15.5:1 air fuel ratio. This is too lean. looking at your oxygen content sampled in the stream it is not surprising. you very likely have a vacuum leak somewhere. best way to find it is hook a volt meter up to your o2 sensor and use a can of brake clean to spray around the intake area and watch the voltage reading from the o2 sensor. Do it a little bit at a time. when the voltage spikes you hit the leak. fix the leak and whatever the shop noted on your customer copy that was tampered. The egr bpt issue sounds like it is the whole deal. probably the modified vacuum lines are causing all your problems because at 25mph your lambda ratio changes but your nox are still very high. the 25mph numbers indicate simply a egr issue. If you have not resolved this yet focus all your effort and making sure the vacuum lines going to the egr and bpt are absolutely correct.

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Smoke and Fire