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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / December 2007failed emission high NOx
My 89 Toyota pickup recently failed emission test for high NOx (1483 std reading 2954). I checked out the egr system as per the service manual and didn't find anything wrong.. I changed plugs, cap, rotor, wires, pcv, air filter about 20K miles ago and the truck rund fine. I did however have to wait over an hour in the line and had the engine shut off. By the time I got to the emissions test, the engine was pretty cold. Could this have caused this? Thanks for comments. > My 89 Toyota pickup recently failed emission test for high NOx (1483 > std reading 2954). [quoted text clipped - 5 lines] > pretty cold. Could this have caused this? > Thanks for comments. No. 1. EGR failure. 2. Ignition timing too far advanced. 3. Lean air/fuel ratio-too little CO and/or too much O2. 4. Defective reduction portion of converter. 5. Compression too high due to combustion chamber deposits. 6. Cylinder imbalance due to intake valve deposits or plugged injectors. 7. Overheating (general or localized). 8. Excessive oxygen in the exhaust from a leak or AIR problem. 9. Defective heated intake, EFE system or heat riser. 10 Jumped valve timing. 11. Wrong spark plug heat range or overheated plugs from improper seating. 12 Burning oil. 13 Vacuum leak. Yes. Catalytic converters don't work when they are cold. > My 89 Toyota pickup recently failed emission test for high NOx (1483 > std reading 2954). [quoted text clipped - 5 lines] > pretty cold. Could this have caused this? > Thanks for comments. i have heard of people failing the emissions test with a cold engine, say 1st thing in the morning, then they went back later in the day and passed with a hot engine. I have heard using washer fluid in your breather filter will lower the NOX. They put washer fluid on there filter just before going into get it checked, apparently this reduces NOX by a few points. >My 89 Toyota pickup recently failed emission test for high NOx (1483 >std reading 2954). [quoted text clipped - 5 lines] >pretty cold. Could this have caused this? >Thanks for comments. An engine that is not fully warm with a hot catalyst will produce higher emissions. If the inspector was doing his job, he would make sure the engine is fully warmed up before starting and rev the engine above 2K for a couple of minutes to warm the converter enough to operate properly. I just went thru the same deal here with my F150 failing the first sample. The inspector then reved the engine as he should and retested. It passed with flying colors. According to him, they are supposed to rev the engine before running the test especially on vehicles that run the 2 speed idle only. He said they do not because a lot of people accuse them of trying to blow their engine. I suppose they could take the shortcut and fail a vehicle if they were in a bad mood or their wife put them in the penalty box. Lugnut > My 89 Toyota pickup recently failed emission test for high NOx (1483 > std reading 2954). [quoted text clipped - 5 lines] > pretty cold. Could this have caused this? > Thanks for comments. Did I miss your engine size and trans somewhere in the post? You've received one correct reply so far. Here's another. Of all the emissions gasses that would fail due to a cold engine, NOx is not one of them. You need to fix your plugged EGR passage, shorted EGR temp sensor, loose or cracked hose(s), too advanced ign timing, failed EGR VSV, or lean running condition FIRST, then reevaluate for other problems that need to be diagnosed AFTER all mechanical systems are working properly. Toyota MDT in MO > > My 89 Toyota pickup recently failed emission test for high NOx (1483 > > std reading 2954). [quoted text clipped - 9 lines] > > You've received one correct reply so far. That would be the one about spraying washer fluid on your filter, Right? Speaking of spray-on applications - Did the guy selling the 'new product to save gas" for 9.99 really say to spray it on the gas pump? > hi. this is a new porduct, we just spray the lique on the gas pump > when we pump our gas into the car. The method is so simple. Im very > happy with the result, so do u think UN9.99 worth to buy ? > > > My 89 Toyota pickup recently failed emission test for high NOx (1483 > > > std reading 2954). [quoted text clipped - 11 lines] > > That would be the one about spraying washer fluid on your filter, Right? Yes, of course! The poster said "They put washer fluid on there filter just before going into get it checked, apparently this reduces NOX by a few points." With 3 'points' out of the way, it should be cake to reduce the next 1468 points simply using proper diagnostic and repair methods. Toyota MDT in MO >> > > My 89 Toyota pickup recently failed emission test for high NOx (1483 >> > > std reading 2954). [quoted text clipped - 18 lines] > out of the way, it should be cake to reduce the next 1468 points > simply using proper diagnostic and repair methods. Oh, you're just being cynical. With a premium washer fluid you should be able to get seven or eight points.  SignatureAngry American flags attack Hillary Clinton! > >> > > My 89 Toyota pickup recently failed emission test for high NOx (1483 > >> > > std reading 2954). [quoted text clipped - 24 lines] > -- > Angry American flags attack Hillary Clinton! LMAO! http://www.prestone.com/products/windshieldWasherFluids.php > >> > > My 89 Toyota pickup recently failed emission test for high NOx (1483 > >> > > std reading 2954). [quoted text clipped - 21 lines] > Oh, you're just being cynical. With a premium washer fluid you should be > able to get seven or eight points. I suppose it wouldn't hurt to use a K&N filter too.... Toyota MDT in MO >>>>>> My 89 Toyota pickup recently failed emission test for high NOx (1483 >>>>>> std reading 2954). [quoted text clipped - 20 lines] > > Toyota MDT in MO And use washer fluid on it instead of that red oil? > >>>>>> My 89 Toyota pickup recently failed emission test for high NOx (1483 > >>>>>> std reading 2954). [quoted text clipped - 22 lines] > > And use washer fluid on it instead of that red oil?- Hide quoted text - Yup. It's a win - win. Toyota MDT in MO How would this filter reduce emissions? I've seen the test stands that show how air flows better through a K&N air filter but I don't think that they will remove as small of particles as a normal filter. Is this true? Someone mentioned oiling the filter. These need to be oiled? The filters on the test stand are not oiled. How does oiling affect the air flow through the filter? > > >> > > My 89 Toyota pickup recently failed emission test for high NOx (1483 > > >> > > std reading 2954). [quoted text clipped - 25 lines] > > Toyota MDT in MO > How would this filter reduce emissions? I've seen the test stands that show > how air flows better through a K&N air filter but I don't think that they > will remove as small of particles as a normal filter. Is this true? Scott, we're having a bit of fun at the expense of the poster who mentioned that soaking an air filter with washer solvent (methanol) might reduce NOx. I tend to disagree in that any change in a closed loop circa '89 Toyota EFI or carb system (again, God forbid a usenet post include pertinent data, as a result we don't know the engine or fuel management system) would be so miniscule as to be indeterminable from test equipment error allowances. 2954 ppm NOx is a SERIOUS OBVIOUS problem that no doubt can be easily diagnosed by any real mechanic in short order. My mention of a K&N filter goes out to those who like to brag about 5 pretend horsepower from their new $50 gauze filter at the expense of actual *filtering* ability. > Someone mentioned oiling the filter. These need to be oiled? The filters on > the test stand are not oiled. How does oiling affect the air flow through > the filter? I don't know what test stand you are referring to, but K&N specifically recommends applying oil sparingly to the filter every time you clean/service their POS filter. The oil is what traps some of the airborne particulates. Toyota MDT in MO > > > >> > > My 89 Toyota pickup recently failed emission test for high NOx > (1483 [quoted text clipped - 30 lines] > > > Toyota MDT in MO- Hide quoted text - A poor choice of words on my part: I should have called it a sales display that is on the counters of several auto part stores. You put a Fram filter on then note how high the ping pong ball floats on a stream of air then put a K&N filter on to see that the ball floats higher. I am glad that you clarified that. From reading your other posts to this news group it seem that you know what you are talking about and I took it as a serious endorsement. > > How would this filter reduce emissions? I've seen the test stands that show > > how air flows better through a K&N air filter but I don't think that they [quoted text clipped - 24 lines] > > > "Comboverfish" <comboverf...@yahoo.com> wrote in message news:ebed39c2-34b9-4066-b808-8fda035743d6@n20g2000hsh.googlegroups.com... > > > > >> > > My 89 Toyota pickup recently failed emission test for high NOx > > (1483 [quoted text clipped - 30 lines] > > > > > Toyota MDT in MO- Hide quoted text - > > How would this filter reduce emissions? I've seen the test stands that show > > how air flows better through a K&N air filter but I don't think that they [quoted text clipped - 61 lines] > > > > Toyota MDT in MO- Hide quoted text - Just thought you would like to know. I won't stand by it never tested it, but if people who loose by a few points may want to try it. more than likely you have a cat converter issue and those are big bucs > My 89 Toyota pickup recently failed emission test for high NOx (1483 > std reading 2954). [quoted text clipped - 5 lines] > pretty cold. Could this have caused this? > Thanks for comments. |
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