Question about 1991 Saab 900

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My 1991 Saab 900 needs an ERG system is this hard to do my self ?

Did not pass emissions failed for excessive NOx. Failure could also be themostat or O2 sensor. I do not have manuel for the car.

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Post the readings. does the car overheat?
NOX is caused by combustion temerature being too high. many possible causes. common ones are EGR system, running lean, deffective catylitic.

Posted on Jun 25, 2009

  • Ellis Small
    Ellis Small Nov 20, 2014

    My 91 saab 900 turbo failed twice due to high nox. my mechanic connected a device to the fuel rail which cleaned the injectors and it passed. it cost me $345.00

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I have a 1999 Chevy S10 2.2L 4Cyl extreme. I can not find or locate the EGR Valve any where,I am pretty sure it does not have one, I wanted to confirm or discuss this with a fixian expert like myself?


Doesn't have EGR valve . How many miles on the truck ?
What Causes High NO (NOx)? Nitrogen Oxide or NO is created when an engine's combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, lower nitric oxide emissions. Below are common failures which may cause your car, truck, van, suv, or motorhome to produce high high nitric oxide. 1. Lean Fuel Mixture - Lean fuel mixtures cause high NOx. A lean fuel mixture exists when less fuel then required is delivered to the combustion chambers or when more air then necessary is added to the fuel. In either case the lack of gasoline needed to cool the combustion chambers down is not present. Combustion temperatures increase causing high nitric oxide emissions. A lean fuel condition may be due to a vacuum leak/s and/or defective fuel control components, such as the Air Flow Meter, Engine Coolant Temperature Sensor, and O2 sensors. Read about Oxygen Sensor.
2. Defective EGR System- The Exhaust Gas Recirculation system is designed to reduce NO. The EGR system consists of an EGR valve, EGR pressure sensor, vacuum hoses, and one or more vacuum switching valves or solenoids. Later model vehicles may be equipped with electronically controlled EGR valves, which do not require vacuum lines or switching solenoids. Electronic EGR systems will have these components built in.
The EGR system's job is to re-route a small amount of exhaust gas back into the intake manifold to help reduce combustion chamber temperatures. As mentioned above NOx is created when combustion chamber temperatures reach above 2500F. By recirculating exhaust gas back into the intake, a small amount of the air/fuel mixture is replaced with inert gas, reducing combustion temperatures. Read about EGR System.
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3. Defective Catalytic Converter (CAT) Some vehicle manufactures have designed their cars to operate without EGR valves. Non-EGR equipped vehicles rely heavily on the Catalytic Converter to assist in the reduction of NO. These vehicles have tendencies to develop CAT problems sooner then those which are equipped. If you own a non-EGR equipped vehicle, and have failed the emissions test for high NOx, pay close attention to the Catalytic Converter. Read about Catalytic Converter
4. High Engine Mileage - Over an engine's lifetime, carbon build-up develops in the engine's combustion chambers. The more miles on your engine, the more carbon build-up on the pistons, cylinder heads and valves. Carbon build-up decreases the available space for the air/fuel mixture to combust, and causes higher cylinder compression. High compression results in high temperatures and high NOx. Keep in mind this problem is usually seen in vehicles with over 150,000 miles which have been poorly maintained. The solution to this problem is called De-Carbonizing. It usually costs around two labor hours at a smog check repair station. It will remove a good amount of carbon out of an engine. This will increase combustion space, lower compression and lower NOx.
5. Engine Overheating - Inadequate engine cooling can will high NOx. If your vehicle's cooling system is not working efficiently, (i.e. bad radiator, thermostat, hoses) high NOx will be created. Remember high NOx nitric oxide is created when an engine's combustion chamber temperatures reach over 2500F. You will want to make sure your vehicle's cooling system is working properly, and your vehicle's temperature gauge is always indicating normal.

Feb 24, 2018 | 1999 Chevrolet S-10 Pickup

Tip

Failing emissions testing due to high NOX (oxides of nitrogen)


I have seen several people posting emissions failures due to high NOX (oxides of nitrogen). Nox is created when the engine's internal combustion temperature gets to high.

Two reasons this can occur is improper coolant levels and a malfunctioning egr system. The egr system injects exhaust gas from the exhaust and uses it to line the cylinder walls.This in turn reduces the combustion chamber size and internal combustion temperatures. Ultimately this reduces the amount of NOX created. These systems functioning properly can be the difference in passing or failing your emissions testing because of high NOX ppm.

on Jun 18, 2010 | Chevrolet 1500 Cars & Trucks

1 Answer

Failed emissions high nox


check iac valve suplly or mechanical stuckup

Dec 19, 2013 | Nissan Cars & Trucks

2 Answers

1995 honda civic failed emissions (GA), what needs to be replaced?


Usually changing the spark plugs, air filter and an oil change will fix your problems. If your oil is old, you can get the high carbon. I don't usually change the spark plug wires and I just take the distributor cap off and clean the contacts.

Nov 27, 2013 | 1995 Honda Civic

1 Answer

Not passing emissions


The NOx (Oxide of Nitrogen) level standard in the state of New Jersey is 1372. Anything higher than this number will fail emissions.
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Dec 19, 2012 | 2008 Chevrolet Suburban

1 Answer

Fail smog test


fist i would like you to post the year make and model of the truck along with the HC ppms and NOX ppm it would be very helpful but high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help cool them there are other causes but without looking at the levels its much harder to say

Dec 06, 2012 | Cars & Trucks

1 Answer

I own a 1991 volvo 940 turbo.it failed emissions test ,it failed on two things and passed on the third thing


what were the specific inspection details like Co, 02, CO2 and NOx readings?

furthermore, have you done any maintenance like fuel filter, oil change and spark plugs?

Sep 21, 2010 | 1991 Volvo 940

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