High NOx

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High NOx

Postby crazyceli25 » Thu May 31, 2012 10:12 pm

I have a 1992 gt4 with 115k on it. I recently took an emissions test and passed on everything but my NOx
were too high. I was wondering, if someone here knows how this egr system works? The valve does hold a vacuum
but the control valve is allowing a vacuum when not being supplied power and closing when it gets power
Just didn't know if that's how it is supposed to be.
I tried searching with no results.
Any help will be appreciated.
Sean
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Re: High NOx

Postby Awesome-Trac » Thu May 31, 2012 11:14 pm

You live in Cali I'm guessing?
-1988 Celica Alltrac (white) Sold
-1988 Celica Alltrac (black) new project
-1990 Corolla sedan (sky blue) totalled by my brother :(
-1990 Celica GT-S hatchback (sky blue) daily driver

•Daniel
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Re: High NOx

Postby tubasteve » Fri Jun 01, 2012 12:04 am

Can't be, Cali does tsi, that tests hc/co
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Re: High NOx

Postby tubasteve » Fri Jun 01, 2012 12:08 am

Also, the egr should be getting "ported" vacuum off the throttle body.

With the car running at idle apply 5 inches of vacuum and car should misfire horribly or die. Apply slow and evenly so that you don't flood the engine with egr giving you a false test. Also the buddy next to it (transducer) usually f fails also causing egr systems to fail functionality.

Very well versed in this.

-jr
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Re: High NOx

Postby crazyceli25 » Fri Jun 01, 2012 7:05 pm

Thanks, I'll give that a try. How could it test the transducer to see if it has failed?
Sean
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Re: High NOx

Postby crazyceli25 » Fri Jun 01, 2012 8:41 pm

I gave that first test a shot. I only got to like 3 inches before it ran like crap
At 5 inches it didn't die but ran horribly
Sean
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Re: High NOx

Postby tubasteve » Fri Jun 01, 2012 9:11 pm

Good, get another transducer, 9 times out of ten is the problem if the flow is good.also taking the timing back a little from ten.

Where on earth are you having a awd tested for Nox? If it's not on a dyno might be hard to lower nox.

-jr

Goto wrecking yard and pick up Camry or other ones that look same. If not I'll type up the test when i get home.
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Re: High NOx

Postby crazyceli25 » Sat Jun 02, 2012 1:45 pm

I live in CO
the testing stations here have AWD dynos
I'll go to the junkyard to find that
Thanks for the help
Sean
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Re: High NOx

Postby tubasteve » Sat Jun 02, 2012 8:32 pm

What are your other numbers for hc/co?

Plus what's all the limits
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Re: High NOx

Postby crazyceli25 » Thu Jun 07, 2012 9:08 pm

HC: 0.5838 GPM Limit 1.5000 GPM
CO: 8.6759 GPM Limit 15.000 GPM
CO2 measured 410.9560 GPM
NOx 5.2602 GPM Limit 3.5000 GPM
Sean
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Re: High NOx

Postby tubasteve » Fri Jun 08, 2012 1:08 am

Was o2 measured?
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Re: High NOx

Postby crazyceli25 » Fri Jun 08, 2012 10:43 pm

nope not on this one
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