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dang smog; 1993 4 door automatic
Topic Started: Aug 31 2017, 09:10 PM (1,026 Views)
ice
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alex smiles

:banghead
Of course, she is running like a top with no issues. And I fail smog. good news is that I just failed the emissions part.

So before I took it in smog shop I did the standard oil change spark plug air filter cap and rotor change. Even went to car wash and steam clean the motor. got water in something and got stuck there at a car wash for an hour in the 100-degree heat. I put the E 85 gas in it also about 5 bucks worth and 5 dollars worth of 87 regular. And no pass.

So the new quest starts. I am going to pull off the egr valve and clean. I guess I should pull off the intake manifold?

whats the best way to go about this? :O

.no (ppm)max 527 ave 201 meas 1068
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JellyBeanDriver


You could try and retard the timing a few degrees. In California I think you can be up to 3 degrees retarded. That will decrease the NOx. Also try going when the air temps are cooler.
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suzukitom
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Tom

If the EGR cleaning doesn't help you pass, I find that the catalytic convertors on Metros start to go around 120,000 miles. NOx readings can get really high. Before and after cat replacement, my NOx reading went from about 800 to nearly 0
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David95237


If you just failed nox, that is probably your egr system.
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ice
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alex smiles

hey dave
what does the egr consist of?
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ptcapboy


I can probably answer that Ice-consists of egr valve and passages, switching valve and vacume lines to turn it on and off and electrical wires to go to ecm and switching valve-you could probably clean your system without removing the intake manifold-I disconnect the exhaust manifold from the head, pull it back far enough to clean the small egr passage on the driver's side of the exhaust manifold and leaving the exhaust manifold disconnected clean the passage in the cylinder head straight back to the intake manifold-I then remove the egr valve and clean the passage back to where I left off at the cylinder head-I then clean the passage towards the throttle body-finally clean the 2 passages in the egr valve itself and make sure the plunger goes in and out-
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evmetro


I basic caveman approach is to pull the egr off and blow into the lower larger hose nipple, while covering up the lower hole with your finger, and make sure nothing gets through. Then, do the same while pushing the diaphram in with your other hand to ensure it opens up to let air out the top hole. Next, blow into the diaphram to make sure no air passes, and this will mean the diaphram is ok. EGR valve good.

Next, while the EGR valve is still off, unbolt the exhaust manifold and slide it back. Take some carb n choke spray and squirt it into the egr hole that leads to the exhaust manifold to make sure spray gets through very easily. If it does not make it out of the hole that is exposed after pulling the exhaust manifold, get busy cleaning the passageway with whatever you can come up with, until the spray can make its way through. Next, spray that carb n choke into the other egr hole that leads to the intake, while holding the throttle wide open to allow a view of where the spray comes out, which is inside the intake, directly below the throttle plate in the back, closest to the fire wall. If you see spray making it to the intake, your are all good.

Last, re install the egr valve with nothing else besides a new egr gasket, and make sure all your connections are correct. EGR system can now be checked off the list.
Edited by evmetro, Sep 3 2017, 04:44 PM.
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ice
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alex smiles

hi hi to all :)
well, today I put it all back together. I took off the EGR valve and cleaned it up really well. After that, I started unbolted the intake and the million hose's . found the 2 passage ways the EGR carbon goes. and spent an hour cleaning that.That just left the passage head passage way. I used the cable trick and some easy off. man, that stuff works wonders! leaves the passage ways shiny new.:)
Tommorrow I am pulling off the exhaust manifold and changing it out with the extra one I have and already cleaned.:)
I have cell phone pics but don't know how to upload. I will take pics with a camera tomorrow.
ps. Can I reuse the exhaust manifold gasket?
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suzukitom
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Tom

You can reuse the steel exhaust manifold gasket if it isn't rusty or flattened. You will know better when you can inspect it after removing the exhaust manifold.
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ice
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alex smiles

hey jellybean,
why better when it's cooler outside?
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ice
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alex smiles

well....
I am a little lost.

the smog man says the EGR valve is not opening. Either the egr is broken or I got one of the hoses mixed up. So no pass smog on visual.
can some one take a pic of where those 2 hoses plug into ?please and thank you
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JellyBeanDriver


Cooler = lower cylinder temps = lower NOx.
Question for you when you cleaned the EGR. Did you clean that nipple off the EGR that feeds the EGR transducer?
Also check that the solenoid works that enables EGR function.

Lastly, what exactly is he checking 'visually' to know the EGR isn't opening? Blipping the throttle you should see the valve open momentarily but it doesn't stay open except under a bit of load.
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ice
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alex smiles

I just mainly focused on the 2 big holes on the EGR. never even thought of the little nipple. How would I go about cleaning the nipple?
can I clean the transducer? and how?
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ice
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alex smiles

what does the transducer do?
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evmetro


ice
Sep 8 2017, 12:53 AM
I just mainly focused on the 2 big holes on the EGR. never even thought of the little nipple. How would I go about cleaning the nipple?
can I clean the transducer? and how?
You only need to focus on those two big holes if the egr valve does not pass the blow test described in post 7. If it seals, you are done with them. Once you have verified that it seals, you can then verify that it opens when you push the diaphragm. If the egr valve passes these simple tests, then your problem is somewhere else.
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