Question about 2003 Chevrolet Avalanche

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2003 Avalanche AIR

How do I know if I have the Air Injection System on my 5.3L Avalanche V-8

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  • Les Schalm Apr 23, 2010

    This is not a California vehicle. I see no "pipes" leading into either exhaust I can assume neither AIR and EGR impact on the manifolds...correct?

    Thanks, Les

  • Les Schalm Apr 25, 2010


    I have an exhaust gasket since I am taking off the manifolds I plan to replace w/headers...



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The secondary air injection(SAI) system would incorporate valves on the exhaust manifolds and catalytic converters to aide in the evaporation of some of the Hc and NoX. If it is a Ca. car it is likely to have additional emissions fetaures. Look at your exhaust manifolds and you're looking for pipes into each side of the engine into the exhaust manifold. If only 1 side has one, this is the EGR valve pipe and would not have anything to do with SAI. Let me know what else I can do for you.

Posted on Apr 22, 2010

  • Kori Policy
    Kori Policy Apr 23, 2010

    You do have an EGR valve and it's electronic. From what you observed, it is very likely you do not have a secondary air injection unit. Do you have some kind of code or issue that would lead you too question the emission controls?

  • Kori Policy
    Kori Policy Apr 25, 2010

    Headers are a good choice. Make sure you have the spots for the O2 sensors so you don't mess with the overall design and performance of the engine.



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Failed smog due to "air injection"

What did you find wrong with the Thermactor/air injection system? If it was a system fault code that indicated the system is not working you likely need to replace the electric pump for the injection. Air injection speeds up the Catalytic chemical process by adding Oxygen when the engine is cold and Hydrocarbon production by the engine is higher. It runs for a very short time and then is shut down by the on board computer when it see the correct O2 signals.

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What does this code mean? P0410

Diagnostic Test Code (DTC) P0410 indicates that your secondary air injection system is not functioning properly.
Not all 2001 Chevrolet Bazers are equipped with secondary air injection. The secondary air injection system was added to vehicles that were to be sold in certain areas where the emissions laws required it, like the State Of California.

The Powertrain Control Module (PCM) monitors the system by commanding the secondary air blower motor to run and the air injection solenoid to open. This causes additional oxygen to enter the exhaust system. The PCM then monitors the signal from the oxygen sensors to see if the commanded air has in fact, entered the exhaust system. Code P0410 sets when the PCM has commanded the blower motor on and the solenoid open and there is little or no change in the oxygen sensor signal.

GM has had some problems with these systems and there has been a Technical Service Bulletin (TSB) issued that addresses some of the known concers. Below is a brief description of the TSB and the issues involved.

Bulletin No.: 04-06-04-015A
Date: November 28, 2006
LN2, L43 or L35 Engine SES/MIL Light Illuminated, AIR Pump Ingesting Water and DTC P0410 Set (Replace AIR Pump and Inlet Hose Assembly)
1999-2003 Chevrolet Blazer, S10
1999-2001 GMC Jimmy
1999-2003 GMC Sonoma
1999-2001 Oldsmobile Bravada
with Vortec 2.2L I4 or 4.3L V6 Engine (VINs 4, 5, W - RPOs LN2, L43, L35)
Some customers may comment on the SES/MIL light being illuminated. Upon investigation, the technician may find a DTC P0410 indicating that there is a concern in the secondary air injection system.
Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump.
Replace the AIR pump and install a new inlet hose and solenoid tube assembly...

The bulletin goes on and gives detailed information on how to perform the repair and the part numbers of the replacement parts needed to do so. Your local dealer can provide the parts for you and you can probably get them to print out a complete copy of the bulletin for you. It is not really hard to do if you want to do this yourself.

Sep 01, 2011 | 2001 Chevrolet Blazer

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Engine hesitates when at highway speeds and engine is warm. Replaced the fuel injection system and still happening. No check engine light

Even with no check engine light i would have the computer scanned for any codes that may be stored as pending, this sounds like a mifiring due to a bad coil or coil boot that acrs, the other thing that comes to mind is to check the mass air flow sensor, look at the air sensors and clean them if they contain dirt, this will allow extra amounts of air to go by without the computer knowing and this would caus a lean fuel mixture. the other and last thing would be to drive with a scan tool in order to see what the computer and sensors are doing as it looses power on the highway. good luck.

Jan 11, 2011 | 2004 Chevrolet Avalanche

1 Answer

2003 VW Passat wagon 1.8 turbo, the check engine lite came on and the code is po411. how to fix without spending money I don't have

This code indicates that you have a faulty secondary air injection system. Basically this is a system in which pumped air is allowed into the exhaust system to help burn off any residual fuel droplets when the engine is warming up and thereby reduce hydrocarbon emissions. The 'injection of air' (opening of the valve) is by vacuum supplied by a thermally resistant over-braided vacuum line. Find your combi 'air injection' valve on the exhaust manifold and then check the integrity of the length of over-braided vacuum line. There is a good chance that the fault is merely a leak in this line (a poor end fitting) and this in turn is failing to supply the necessary vacuum to open the valve to allow pumped air into the exhaust. Hope this helps point you in the right direction.

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Where is the throttle body located on a 2003 chevrolet avalanche


The Throttle Body is the part where the Air Filter Hose Connects into. The Throttle Position Sensor and the Idle Air Control selenoid are located.

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Sep 03, 2010 | 2003 Chevrolet Avalanche

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How do i fix a0410 code

The code basically says that the O2 sensors did not see the extra oxygen that the air injection system would normally provide.
Check that the air injection shut-off valves hold vacuum. It's a common failure.
Also, you might want to power up the air injection pump and make sure it is working.

Mar 28, 2010 | 2003 Cadillac Deville

1 Answer

I washed the engine on my 2003 avalanche now the reduced power lite is on

what happened is it got water either in the fuel,oil,or the air system change the air filter and put some gas cleaner go to any auto part store you should be able to ask pretty cheap around 5 to 8 bucks hope this helped :)

Mar 26, 2010 | 2003 Chevrolet Avalanche

1 Answer

Trying to locate cabin air filter in 2003

The 2002/2003 Silverado was a change over year for Cabin Air filters. I know with the Chevy Avalanche the 03's did not have them and 02's did. The dash/center console changed with the 03's, and I believe it was done away with in that change over.... Still shows up on catalog, but the 03 has no Cabin Filter.

Good luck, and Merry Christmas

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I have a code P0491 coming up on my 2004 Dodge Stratis, this is a secondary fuel injection system and don't know wear to start to correct this.

P0491 Secondary Air Injection System (Bank 1)
This code is not fuel injection but air injection, replace the secondary air injection pump.

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