Skishop69, thanks for the info. I will do a combination of the tactics recommended in this thread. Then give it another test and see what happens. My suspicion is there must be an EGR blockage or maybe it has failed. Rock Auto carries EGR's but they are not the correct part. My part number book says I need #14710 AA170 which has the tube to connect to the "anti-backfire valve" (I think that's what it is). The Nox number on my report is very high from what I have been told so whatever is causing it must be profound. I will report back what happens. Thanks for all the feedback USMB! Aaron
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85 GL wagon smog fail
Posted 01 June 2014 - 01:12 PM
did you test egr yet? on the backside there is an opening. you can push in the diaphragm while it idles and the motor should start to stall out if the egr is working properly. if not , it is easy to take off. cleaning all the carbon off if the diaphragm is NOT broken is time consuming.
also , you the passages in the manifold are probably clogged with carbon too. I cleaned mine out with screwdrivers and wire from a clothes hanger and whatever else would fit.
Posted 16 June 2014 - 09:14 PM
Hey roadsubiedog, I have not had the wagon retested yet. I have done the following: 1) removed and inspected the EGR. It wasn't clogged up with chunks or pieces of anything but has charcoal black coating on passages and ports. I moved the valve open and closed and put a finger on the vacuum line connector and it had good suction. The valve remained in position until I removed my finger. IMO the EGR seemed fine. The small 90 degree elbow vacuum line hose (numbered 5504) was loose on the nipple coming off the intact manifold. The hose is hard and rigid and I thought maybe it was leaking vacuum and not actuating the EGR as a result so I replaced it with a different hose that fits snug on EGR and manifold nipples. This may have been the big gross polluter culprit...I don't know.??
2) I had an almost empty tank of gas and I added 1 can of Sea Foam to that gas then I drove until the tank was empty.
3) I filled the tank with 91 octane and added 1 bottle of "Guaranteed to Pass Smog" product, which according to instructions says retest after a full tank is run through the engine.
4) I changed my oil and oil filter.
Yesterday while crawling under the car I noticed an exhaust leak coming from an exhaust pipe flange connector before the muffler and I am wondering if that would cause NOx to exceed limits. My car has no appearence of smoking whatsever, runs with good power, idles about 800 rpm but it does have a slight "off balance" kind of idle. So I plan to remove the bolts and put a new gasket in a clamp down on it with new bolts. So thats the update as of now.
I plan to fix that exhaust leak and run out the tank of gas with the Guaranteed to Pass Smog in it. Then I'll add 2-3 gallons more of 91 octane and get it retested. BTW will a octane booster product help and cause an engine to burn cleaner? thanks for all the help, Aaron
Posted 17 June 2014 - 02:56 PM
it seems like you are doing everything you can. I had to change an exhaust gasket a couple times too. I think the high octane gas is so it burns hotter and burns off excessive HC , hydrocarbons. the high NOX , I believe, would be either from a defective EGR, a lean air/fuel mixture or a defective cat. I think these were covered here on this thread.
you said you tested the EGR? at idle push in the diaphragm and the motor should almost stall if it is working correctly.
on my car the carb has the air/fuel mixture screw blocked behind a plate that has to be done by a mechanic. I don't know how to correctly adjust this. not sure how you test a cat. the mechanic pointed a heat gun at it to see if it was functioning correctly.
Posted 17 June 2014 - 08:13 PM
An exhaust leak upstream from the O2 sensor can cause you to fail with excessive O2 readings, but has nothing to do with NOX.
Octane rating of fuel has nothing to do with it's BTU rating (energy and burning temp). Octane rating relates to how well it will withstand detonation, IE: combusting prior to ignition due to high compression and elevated temps.
Posted 29 June 2014 - 04:33 PM
any update? real curious to see how you did as my 84 is coming up for smog soon.
Posted 30 June 2014 - 12:42 AM
Hey roadsubiedog, I have not had the wagon retested yet. I haven't done anything more except burn 2/3 of the tank down with that product "guaranteed to pass smog" in it. I think Tues or Wed I'll be getting it tested and I will post results after including a photo of the smog test figures. I don't drive the wagon daily so using a full tank takes longer for me. Thanks for asking and take care, Aaron
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