Question about 1999 Chevrolet S-10 Pickup

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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?

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 but wanted to confirm with some other fellow fixians if any one knows for sure.. I even tried autozone and didn't come up with anything the truck is running rich and will only not pass the 15mph NOx test for smog.. I need the truck to pass the test I've tried all the basics already..? Any Suggestions.. Thanks to you all.

Posted by Ian Center on

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2 Answers

Jeff Armer

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  • Chevrolet Master
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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.
Regular Smog Check STAR Smog Station Smog Check Repair Mile: 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 30 Which Type Should I Choose? > " name="submit" style="font-size: 16px; font-weight: bold; border-radius: 0px; border-width: 0px; border-style: solid; border-color: rgb(51, 127, 237); padding: 2px 10px; background: -webkit-gradient(linear, 0% 0%, 0% 100%, color-stop(0.05, rgb(61, 148, 246)), to(rgb(30, 98, 208))) rgb(61, 148, 246); color: rgb(255, 255, 255); min-width: 195px; min-height: 30px; text-shadow: rgb(21, 112, 205) 0px 0px 0px; box-shadow: rgb(151, 196, 254) 1px 1px 0px 0px;">

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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.

Posted on Feb 24, 2018

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jack layton

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  • Chevrolet Master
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I thought this was the erg valve? Jeff if I'm wrong, I certainly apologize to you an Ian. My database did show egr wiring diagram? Of course these databases are not always correct. Does the picture look familiar?
I have a 1999 Chevy S10 2.2L 4Cyl extreme. I can n - egr-kfzxempkjakowcrkjvcrtoag-5-0.jpg

Posted on Feb 24, 2018

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5 Related Answers

tbirdfan1

Michael Thomas

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SOURCE: 2001 Sonata V6, Smog failed - high NOX

if i were you i would contact cragen and ask them if the car has it and how much the replacement part is

Posted on Aug 19, 2008

justuscc

Jimmy

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SOURCE: CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.

nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Posted on Oct 24, 2008

jgwhomeequip

Jeremy Reddick

  • 1902 Answers

SOURCE: egr valve on a 99 saturn sl

Take it off and look at it internally, See if you can move the diaphragm if not then it needs replacement. But you should just go ahead and replace it anyways since it is a 99 it would just be worth it

Posted on Feb 11, 2009

Jim Yeh

  • 15 Answers

SOURCE: Emissions failing with high NOx

You need to check the oxygen sensor. You car may be running lean and therefore giving you increased NOx levels

Posted on May 30, 2009

toneman2121

toneman2121

  • 775 Answers

SOURCE: check engine light on-code says egr valve is bad

the egr system consists of control circuits as well as the egr valve itself. troubleshooting will have to be performed in order to pinpoint the fault. the valve may just need cleaning. there may be damage in the long run since the egr system introduces exhaust gas to the air intake to reduce combustion temperatures.

http://www.aa1car.com/library/egr.htm

Posted on Apr 21, 2010

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1 Answer

I have a 1999 Chevy S10 2.2L 4Cyl extreme.. EGR?


you're correct the 98's come with an EGR valve and the 99's don't.

Feb 23, 2018 | Cars & Trucks

1 Answer

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 but wanted to confirm with some other fellow fixians if any one knows for...


Hello I'm not sure ware you are getting your information but its wrong.You do have an E.G.R valve on your 99 2.2 Chevy engine it stands for exhaust gas recirculation its mounted on the right hand side at the rear of the engine next to the valve cover and has a electrical connector plugged into the top of it.
You say NOx problems its likely the problem if you are getting engine lights service engine soon read the code it will be P0400 to P0409 .
You may be able to clean it their not cheap if the vehicle was running good if it wasn't running good forget it you have to replace it .
Also make sure you replace the gasket and clean the mounting surfaces bring the old part and the VIN # off the dash board Also remove the IAC idle air control valve its a pintle system to just don't push it in when you clean the seal you can damage it its a stepper motor.

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The EGR Valve is located: Under hood, center, upper engine area, mounted on upper rear of engine near valve cover.Here's a link to what it look's like. EGR Valve at AutoZone com Best EGR Valve Products for Cars Trucks SUVS

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V6? 4cyl? what is the code? there is no code that says "replace egr valve", the passages may be stopped up. open the egr valve manually (a scanner may be able to do thiis) and see if the engine idles rough or stalls out (it should if passages are flowing) if not you need to take valve off and clean the EGR passages. If you cant open the valve, take it off, one hole is exhaust. the other will be vaccuum, from the intake manifold. A bad map sensor could also cause a egr malfunction code.

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For 1996 GMC Truck Sonoma 2WD 2.2L SFI OHV 4cyl
The EGR Valve is located under hood, center, rear engine area, mounted top rear driver side of engine.

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Fig. 11: Unfasten the EGR valve retaining bolts...


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Fig. 12: ...then remove the EGR valve from the vehicle


I really hope help with this (remember rated and comment this post).


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