Question about GMC C1500

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I have a 1979 GMC pickup 1/2 ton I need to know what was on this vehicle for Emissions. I have already installed the cats and have an EGR valve to install but what else would I need

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1979??' you sure it doesnt have any emmisions controls this didnt come in till 1992

Posted on Sep 06, 2010

  • jfclark47 Sep 06, 2010

    Thanks for the question back Wiz, I can just go by what I have been told and that is it requires Cats, EGR valve and a charcoal canister, what else I do not know

  • Colin Stickland
    Colin Stickland Sep 09, 2010

    Sorry but iam in europe and our regulations are different obviously ,we didnt have emmision controls till 1992 ,although i do remember building pinto engines in fords of dagenham UK in the early 70s and the pinto engine did have a lot of equipment that the engines destined for the home market didnt have ,also the home market engines had a lot higher compression ratio as well .Sorry i couldnt help but if you ever buy an old europeon vehicle as a collector item and need help iam your man but american home market vehicles ?? Havent a clue to be honest but the faults are the same so diagnostics isnt a problem its just when i get asked wheres this or that on a saturn or something ?? well never seen one in my life except on TV ,but if they ask about a honda or hyandai then their all the same now europeon and american models except for the software ??? DONT GO THEIR ours are all encrypted which makes them dealer only .No questions tonight on fixya though after 11 hours of graft today i will answer some returns and that all .

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How do you know if your EGR valve needs replacing?


Symptoms of a Bad EGR Valve ' AxleAddict

https://axleaddict.com > Auto Repair > DIY Auto Repair
Mar 8, 2018 - If the EGR Valve Sticks Open: A rough idle upon starting the engine (that is, when the engine is cold) and sometimes at a stop light or while looking for a spot in a parking lot (that is, at low engine speeds in a warmed-up engine). Stalling when the engine idles. Increase in fuel consumption.

Does your EGR valve need replacing? ' MicksGarage.com Blog

https://www.micksgarage.com/blog/does-your-egr-valve-need-replacing/ Aug 17, 2017 - Before removing anything, check that the replacement EGR valve you've bought looks identical to the old one with the same connections and fittings. If the EGR valve has vacuum pipes to it, label them before twisting and pulling the pipes off by hand, being careful not to break or stretch them too much.

Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Valve ...

https://www.yourmechanic.com > Articles Jan 7, 2016 - If the computer detects an issue with the vehicle's EGR valve circuit or position, it will set off the Check Engine Light in order to notify the driver of the issue. ... the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the vehicle needs an EGR valve replacement.

Signs of a Bad EGR Valve - RepairPal

https://repairpal.com > Encyclopedia > Exhaust and Emissions Jul 4, 2008 - A scan tool will show both trouble codes and live data related to the EGR valve. It may also have a function for remote EGR valve control. A valve that is found to be bad should be replaced. If EGR-related problems persist after valve replacement, the issue may be the EGR passages in the intake manifold or ...

Symptoms of a bad egr valve how to change a bad egr valve - YouTube

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Apr 27, 2018 | Cars & Trucks

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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.
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.

Feb 24, 2018 | 1999 Chevrolet S-10 Pickup

1 Answer

Identifying engine emissions parts for a 1977 gmc 1/2 ton California pickup


LIGHT DUTY. TRUCK. (SERIES 10-35). CHASSIS SERVICE. MANUAL. CAUTION. This vehicle contains some parts dimensioned in the metric system as well .... 3-Cab-Chassis. 4- Pickup and Van. 5-Panel. 6-Suburban. 7-Motor Home. 8 -U tility. SERIES. 1 44 TON. 2 %. 3 1. - MODEL YEAR. 7 = 1977for all. Series.
https://babasupport.org/routers/tp-link-customer-service/778

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Chevy pickup 350 vortex code p-1406 comes up can't find what code means in my book. i know it has something to do with manufacturer control auxiliary emissions controls. i don't know where to look for the...


DTC P1406 IS EGR VALVE PINTLE POSITION CIRCUIT MALFUNCTION CONDITIONS.POSSIBLE CAUSE EGR SOLENOID CONTROL CIRCUIT IS OPEN SHORTED TO GROUND OR TO B+ -CHECK EGR VALVE FUSE - OR THE EGR VALVE AND PCM HAS FAILED.

Jul 09, 2010 | 2002 Chevrolet Silverado 1500

1 Answer

How do I replace the upper Control arms on My 1979 chevy 1/2 ton pickup. I saw a replacement control arm that has the bushings and ball joints already installed. I'm trying to save the high labor cost that...


Since the new arm comes with the bushings, there is no reason to get the tool to install them. Upper arms are relatively easy to install...just a bolt out, bolt in operation as the springs aren't involved. Support the suspension under the lower control arm to take any tension off the upper arm.

Apr 27, 2010 | 1978 Chevrolet C1500

2 Answers

Cannot pass emissions. Already changed plugs, air


Try cleaning the EGR valve or just replacing it and replace the PCV valve as well.

Nov 03, 2009 | 1990 GMC Sierra

3 Answers

FAILED EGR VALVE


The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases.

The EGR valve is vital to your car's emission controls.

When the EGR valve goes bad, it must be replaced - it cannot be repaired.

  • EGR Valve = Exhaust Gas Recirculation Valve.
  • The EGR valve controls formation of noxious emissions.
  • Rough idle and poor acceleration can be caused by a faulty EGR valve.

  • The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on accelertaion.

    The only short term problem is a decrease in gas mileage - but it should really be replaced before sensors become sooted or your cat. convertor gets overworked prematurely.

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    Apr 15, 2009 | Chevrolet Impala Cars & Trucks

    1 Answer

    1998 chevy pickup V8 130.000 miles running very rich. Done a complete tune up. plugs, wires cap, rotor, and relplaced one o2 sensor still running very rich. what would happen if the EGR valve is bad?


    The Exhaust Gas Recirculation (EGR) valve is an important part of the exhaust circulation system of a vehicle. EGR valves have been in use in the United States since the 1960s, when car companies were seeking ways to increase the efficiency of vehicles while also decreasing pollution. When the EGR valve is clogged or malfunctioning, it can cause irregularities in engine performance such as rough idling or valve knock, indicating that the EGR valve should be inspected.
    The EGR valve works by routing a small amount of exhaust back into the combustion chamber, where it can be reused. This is done for a number of reasons. The primary reason is that a certain temperature is required in the combustion chamber, and exhaust is much warmer than air taken in from the outside. As a result, the engine need not work as hard to heat the combustion chamber to optimal temperature. The second reason is that the use of an EGR valve helps to reduce nitrogen oxides, which will combine with elements in the atmosphere to form smog.
    Many EGR valves are mechanical, and simply have a small valve which opens to allow exhaust into the combustion chamber and closes when it is not necessary, and to keep the air mixture optimal for combustion. Some mechanical versions will not open until there is sufficient back pressure, ensuring that the valve will not be open when the engine is idle or warming up and needs a higher concentration of oxygen for combustion. Electronic EGR valves are also available, and use electronics to regulate the valve.
    If the EGR valve is stuck open, it will essentially cause a vacuum leak, leading to inefficient combustion, rough idling, hesitation, and sometimes stalling in extreme cases. This is because the car cannot combust on carbon dioxide from the tailpipe alone-it needs atmospheric oxygen as well. If the combustion chamber is flooded with exhaust from an open EGR valve, it will not function properly. To check and see if the EGR valve is stuck open, have someone idle a parked vehicle with the brake on while you examine the plunger shaft to see if it is stuck open.
    If the EGR valve is stuck closed, emissions of nitrogen oxides will rise, and the car may start to knock. Spark knock happens when the fuel mixture in the combustion chamber ignites before it has been reached by the explosion in the cylinder, resulting in a disruption of the engine timing. In this instance, the engine should be warmed up and revved to see if the EGR valve will move.
    In both cases, simple repairs are possible. The EGR valve can be clogged, and a simple cleaning of a mechanical EGR valve may solve the problem. In the case of an electrically controlled EGR valve or a more complex mechanical problem, replacement of the valve may be needed. The EGR valve is an expensive motor vehicle component, and care should be taken to ensure that it needs to be replaced rather than repaired. A reputable mechanic should advise you appropriately.
    Failure to repair or replace the EGR valve will not lead to a life threatening condition, although it will reduce the life of your car and increase the potential emissions. Especially in areas which require smog testing, an automobile with a malfunctioning EGR valve may not pass.


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    Mar 26, 2009 | 1996 GMC Sierra

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