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1979 corvette vacuum diagram

L48 failed visual smog because of mis routed vacuum lines to egr, distributor, and emissions devices. Need the diagram to get it routed right

Posted by Leisa Weddle on

  • Robert Wood
    Robert Wood Jul 01, 2015

    Federal and California. Federal says federal and the other is California.



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Robert Wood

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California or federal ?

Posted on Jul 01, 2015

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I suggest www.wilcoxcorvette.com. excellent web site for corvette owners.

I’m happy to assist further over the phone at https://www.6ya.com/expert/richard_9a19ee73dfa4686a

Posted on Jul 01, 2015

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Marvin

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  • Cars & Trucks Master
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We do not have these diagrams.

Posted on Aug 31, 2013

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Anonymous

  • 40 Answers

SOURCE: my ''nox'' emissions was to high on smog test?

Check the timing.

Posted on Mar 19, 2009

Anonymous

  • 2 Answers

SOURCE: emission vacuum hose routing 1987 corvette

There's are two stickers on the top of the radiator. There is one at the filler cap that shows the pulley and belt arrangement and the other one shows the routing of the emission hoses with charcoal canister.

Posted on Apr 01, 2009

Anonymous

  • 382 Answers

SOURCE: starter wire diagram 1980 l48 corvette

dear friend:please go onto the following sites in order to find the diagrams .www.schiffeuropean.com, www.hmaservice.com and www.books4cars.com

Posted on Sep 23, 2009

Anonymous

  • 524 Answers

SOURCE: Need 95 gmc jimmy vacuum diagram. I have a loose

THat goes to your map sensor. If you look very closely under your hood there will be a vac line diagram there

Posted on May 09, 2010

Anonymous

SOURCE: need vacuum diagram for EGR valve on 351 Windsor engine

The diagram is under the hood on the Federal Emission Label

Posted on Oct 03, 2012

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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

Need a vacuum routing diagram for an isuzu elf 1998 model truck


Heavy truck, ELF>
is car USA< this is a USA forum.
and our smog parts are not like YOURs, if not here.
no engine stated.
no country stated.
in the USA even california has there own laws on EGR, and more.
so it be impossible to answer you.
its not as simple as you think, sorry

Jul 24, 2016 | Isuzu Cars & Trucks

1 Answer

I NEED A DIAGRAM FOR THE EMISSIONS/SMOG AND ALL VACUUM LINES


All those diagrams are useless, unless you know what they go to. And where they are located. They give you a general idea, but that is it. If you don't know what an EGR valve is or what it looks like. How can you find it? Exact same with electrical schematics.

Aug 04, 2015 | Cars & Trucks

1 Answer

I need the vacuum diagram for 1986 ford truck with a300 6cil


Short of a Haynes or Chilton repair manual for pickups covering your year's truck, I don't know if you could find a vacuum diagram easily on the internet. However a google search might give you a strand of hope. That was about the year that ford (and all of them to be sure, to some extent or another) went crazy with vacuum controlled emissions and operations. As soon as they grudgingly accepted fuel injection over carburetors as the reality, all those crazy vacuum diagrams disappeared. They met emission regulations through better computer management operations. Sigh, I'm still reliving the nightmare of electronically controlled carburetors (feedback carburetors, as your ford is called-works real good when it is working good) via my 1987 sentra with two solenoids in the carburetor for fuel-air mixture control- now I'm looking for a replacement carburetor. You would not believe the virtual array of vacuum lines on my sentra. They even included a long stack of metal tubes across the top of the engine, lol.

Anyway, by now that truck is so old, what do you need beyond the brake booster hose, the vacuum advance to the distributor, if you have a MAP sensor equipped, that is a straight manifold tap, and then a tap for the egr valve, maybe controlled by a thermal switching valve-you know, when the coolant is hot, the valve switches air, or vacuum really, to the egr valve. Your charcoal canister would have, I think, a manifold vacuum hose. I might be missing a few, but you might be able to struggle through it. If you have a working smog pump, maybe called an air pump, you will really need a vacuum diagram. There should be several older ford truck enthusiasts forums that you could join. Somebody would surely have it.

Mar 06, 2015 | Ford Cars & Trucks

2 Answers

I need a vacuum lines routeing diagram for a 1985 blazer 4x4 2.8l does anyone knw where i can fine one?please help me


The (engine vacuum) routing-- is on the radiator support label
under the hood support rod

Feb 14, 2013 | 1985 Chevrolet S-10 Blazer

1 Answer

Failed smog check


How well does the vehicle run?

Assuming that the engine did pass the EGR function test on the emission test results, and the MIL (Malfunction Indicator Light) or check engine light is not on when the engine is running, and if you are not sure when the last time it was that the engine had a complete tune-up, with distributor cap, ignition rotor, spark plugs, spark plug wires, air and fuel filters, then a complete tune-up would certainly help, and if the engine oil and oil filter have not been changed in a while, then they should also be changed before an emission test because long used engine oil traps carbon and it will show up as higher CO on the emission test because the emission analyzer will be able detect the higher CO from the engine oil through the PCV valve.

However, it would seem from those HC readings that there is a vacuum leak, and carefully inspect all of the vacuum lines for any cracks or damage, (especially the vacuum line to the fuel pressure regulator) because cracks in the vacuum lines seem to like to hide underneath the lines.

The emission label under the hood should have the vacuum line routing diagram printed on it, and the vacuum lines should all be checked to be certain that they are all connected correctly.

Here is the firing order diagram for that vehicle to help assist you tune-up the vehicle.


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Jul 09, 2010 | 1997 Honda Civic

1 Answer

85 volvo dl fuel evaporative control functional (failed) @ smog check


replace the pvc valve and have the egr valve replace.make sure the vacuum hoses connect to egr valve and pvc replace.change air filter.all those things will cause high emission if not working properly.cause you to fail smog test.

May 31, 2009 | 1985 Volvo DL

1 Answer

Check engine light on - P0400 malfunction


Exhaust Gas Recirculation (EGR) System The exhaust gas recirculation (EGR) system recirculates exhaust gas into the intake manifold (9424). This lowers combustion temperatures and reduces the formation of oxides of nitrogen (NOX). The amount of exhaust gas reintroduced and the timing of the cycle varies by calibration. Timing and volume are controlled by the powertrain control module (PCM) (12A650). The EGR valve (EGR valve) (9D475) is vacuum actuated. The vacuum hose routing diagram is shown on the Vehicle Emission Control Information (VECI) decal. EGR operation stops when the engine temperature is cold, to improve driveability. The PCM controls the EGR solenoid vacuum valve (9D474). When energized the intake manifold vacuum outlet fitting and cap (9A474) allows exhaust gas to be circulated in the engine to be burned.

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Oct 20, 2008 | 1997 Ford Aspire

3 Answers

Emission control hose routing


On line. Google 'emissions vacuum routing', you should be able to get an accurate diagram

Mar 18, 2017 | 1984 Chevrolet Blazer

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