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Discussion Starter · #1 ·
the HO and CO were waaaaaay under average. NO was over twice the max level....my timing was at TDC ( ooops my bad) so i set it back to stock. he said maybe EGR is bad? it works, i checked it. when is vaccuum supposed to be applied to the EGR? i know it works when it get vaccuum and its not plugged.....what else to do to lower NO levels? thanks
 

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The EGR has vacuum modulated to it at part throttle. EGR should be closed at WOT and at idle. The test to see if it is working is to apply vacuum at idle, the EGR opens and the engine dies. EGR DOES lower NOX. NOX is formed during high temperature combustion, and EGR lowers peak combustion temps. Did he try it after you advanced your timing? EGR shouldn't directly effect NOX at idle, but timing could. Higher octane gas may help as well.
You could try plugging a vacuum gauge into the line to the EGR and drive it. If you have vacuum at part throttle, it should be OK. Just run it down the highway before you go in, and give it another whirl!
 

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Discussion Starter · #3 ·
when i applied vaccuum th the EGR, it ran reeeeeealy rough and almost died, but it did not totally kill the motor.....what does this mean?
 

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Originally posted by dallas:
<STRONG>when i applied vaccuum th the EGR, it ran reeeeeealy rough and almost died, but it did not totally kill the motor.....what does this mean?</STRONG>
Its working, need to make sure you have vacuum at cruise. May have carbon on the
pistons, high engine temp.,bad cat..

<IMG SRC="smilies/smile.gif" border="0">
 

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I ran mine through emissions with a hollowed-out cat just to see what it would do (we get a free re-test after fail). HC and CO were well within acceptable limits but the NOx went through the roof, more than double the limit, qualifying me as a gross polluter (yeah, right...). Anyway, threw a new cat on it, drove it around for about an hour, then went back and re-tested the same day. Passed with flying colors <IMG SRC="smilies/biggrin.gif" border="0"> So I would say check your catalytic converter.
 

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Really, cause the one I bought had an arrow on it indicating the direction of the exhaust flow...... <IMG SRC="smilies/question.gif" border="0">

[ 10-27-2001: Message edited by: Bad Karma ]
 

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In Vacaville you got to do the SMOG II, Treadmill test, that sucks!!! Hope you paid extra to do the pretest first. You don't want to get tagged as a gross polluter.
If your engine is dying when you apply vacuum to your EGR valve, its working as advertised. I also throw in the vote for the Cat being bad. <IMG SRC="smilies/skull.gif" border="0">
 

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Discussion Starter · #10 ·
okay EGR is good, timing is set right....looks like the cat is bad then, there arent any holes in the scree <IMG SRC="smilies/confused.gif" border="0"> that might not matter tho....yup dyno tested it, but the smog guy is reeealy cool and said that the gross polluter thing is not used anymore, they call you that, but as soon as you pass the re-test it is taken off your record. casue i was gonna do the pretest, but he said its a waste of money because they dont tag you as a gross polluter forever, just until you pass again. i hope hes right, i trusted him. <IMG SRC="smilies/eek.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0">
 

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My nox was through the roof so I took off my egr and it was clogged down with carbon ...cleaned the pipe out and passed with flying colors <IMG SRC="smilies/biggrin.gif" border="0">

[ 10-28-2001: Message edited by: sschevytrucks ]

[ 10-28-2001: Message edited by: sschevytrucks ]
 

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Discussion Starter · #12 ·
STILL DIDNT PAss!!!

i put in a new cat, but i still was too high on NO. the cat only had 5 miles on it tho when i tested....EGR works, BUT is the port on the head supposed to be blowing when the EGR is off? or does the intake vaccuum suck the gasees thru? HELP HELP HELP! thanks, i am running wiht expired plates!
 

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Re: STILL DIDNT PAss!!!

dallas said:
i put in a new cat, but i still was too high on NO. the cat only had 5 miles on it tho when i tested....EGR works, BUT is the port on the head supposed to be blowing when the EGR is off? or does the intake vaccuum suck the gasees thru? HELP HELP HELP! thanks, i am running wiht expired plates!
hook up a hand vacuum pump to the egr valve. With the engine running, apply about 5hg. of vacuum to the valve. The engine should start to run really rough or flat out die. If it doesn't, either the valve is stuck closed, or the passages are plugged. In either case, take the valve off. put vacuum to the valve and make sure it opens. if it does, try tostart the engine with the valve off.
if it idles o.k. the intake manifold side is plugged. if you don't hear
a loud exhaust leak, the exhaust side is plugged. it is almost always a plugged intake side. Good luck!
 

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I just had my '81 22R fail at idle. The HC PPM was way over the limit, but at 2500 RPM, it ran clean. I talked to a Toy mechanic, and he told me to turn the fuel mixture screw in a few turns until the idle drops and then turn the idle back up.

I don't know if this wil help ya, but thought I'd put it out there.

Hopefully, it will pass today!
 

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It sounds like you are desperate to pass. If all else fails try what I did. On my fully desmogged FJ40 I got it to pass by adding a gallon of denatured alcohol and a bottle of "guaranteed to pass" fuel additive to 1/4 tank of gas. Passed with flying colors.
 

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you need to check the EGR and see if it's actually getting vacume at cruise speeds. If you can find a vac. guage hook it to the line that acually opens the EGR valve and verify that the EGR is actually getting vacume at part throttle. I the valve causes the engine to stall or run rough at idle when vacume is applied it's functional but might not be opening when you actually drive.

on a toyota there is a metal tube that comes off the side of the cast iron part of the EGR and runs to a plastic valve that controls the EGR(backpressure switch, I think), this line is almost allways clogged. Run a coathanger down that thing and make sure it's open and that all the vacume crap is hooked up correctly.

this is a great page for troubleshooting smog stuff.

good luck
 

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<font color="yellow">Too bad you don't live in memphis (just the sniffer, at idle, and your done).

Mine had no cat (NOx was way high), so I left, disconnected the wire to one of my fuel injectors, and passed running on 3 cylinders.</font>
 
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