Question about 2004 Buick Rainier

1 Answer

Secondary air injection check valve

Po410 code.runs fine at slower speed then i get loss of power.turn off engine for a few mins.then go again fine for a while.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 195 Answers

Exactly what the code entitles, the air injection valves that shoot air in the exhaust to help burn excess gasses when the engine warms up the engine when it's cold are malfunctionning. When the engine is cold is just started, it uses what we call a open loop, the engine runs fuel maps and such with a stored program in the ECU that doesnt take in account all the sensors to allow a smooth start and warmup, then after it's warm enough and all, it goes to closed loop using all sensors to lessen the pollution. So when in closed loop, the ECU uses the oxygen sensors to adjust air/fuel ratio, but seeing as how the air injection is possibly jammed open or malfunctionning in some other way and sending air in the exhaust, the sensor think the engine is running lean and injects extra fuel to compensate, but since the reading is false, the engine is actually running rich and making you lose power. Try bypassing the air injection if you want to test this, just find the hose in the exhaust manifold that goes to some black plastic canister type thing and unplug the hose from the canister and find a way to jam it shut so no air can get in. If you sealed it good you should now have full power when the engine has run a while. Hope this helps!

Posted on Jan 04, 2014

4 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 1 Answer

SOURCE: I have a 2004 buick rainier and i,m getting a code po410

Check the fuse before you change the pump. I spend over $300 on a new pump and all needed was a $15 fuse. I think what happens is water gets in the pump and freezes in winter. The pump tries to turn on but is frozen in ice and blows the fuse rendering the whole system useless. Easy way to check is to diconnect a hose from the pump and switch the air conditioning fuse with AIR fuse and start the truck cold. They share the same fuse type. Trust me you know if the pump kicks on, lots of air comes out!

Posted on Jul 08, 2009

  • 4803 Answers

SOURCE: 06/12/11 new question

Did you check to see if there is power getting to the pump? Did you check the air pump fuse? Do you have any power at the relay that you replaced? Is there any power at the combination valve? Is the computer able to ground the relay? Is the computer able to open the combination valve? Did the relay check bad? If not, why did you replace it?

The only way to effectively check the entire air pump system is with a scanner. You can perform continuity tests on every wire, but you cannot verify proper operation without a scanner. You must command the air pump on with the scanner and check to see if power is getting to the pump. Without the scanner there is no way to tell if the computer is even able to operate the relay so the pump can get the power it needs. There is most likely a broken wire or bad connector somewhere, but the only way to find this without a scanner would be to physically inspect every wire in the system manually and just hope and pray that the computer is actually sending the signal to the relay. (You will not know if it is a computer malfunction unless you physically eliminate EVERYTHING else.)

DTC P0410 sets when the PCM commands the air pump on and the combination valve open and there is no change in the oxygen sensor voltage. The problem can be in the air pump circuits, the combination valve circuits, The combination valve itself, the air pump itelf (not likely if you can get it to run with a jumper) a faulty PCM, or even rarely but possibly, clogged-up ports in the exhaust manifold. Again, a scanner is required to verify the operation of the circuits as well as to verify that the problem is fixed after repairs are made.

Please also review this article:

What Else Could Be Wrong?

Posted on Jun 13, 2011

  • 5370 Answers

SOURCE: my check engine light codes read that either the

Apply direct power to the pump and see if it works, if not then pump needs to be replaced.---------- There have also been cases reported where water gets into the pump and clogs things up and burns out the motor. But you should be able to check that the pump still works by applying power directly to the connector pins (+12 volts at the Red wire, Ground to the Black wire).
The AIR pump (the major part of the system) is located at the lower driver side of the vehicle, tucked up between the fender and frame. You will have to remove the left front wheel and the left front fender liner to get to it.
The air check valve, needs to be replaced.

The Air pump check valve keeps hot exhaust gases from backing up into and ruining the air pump.

To Replace the Air Pump Check Valve

  1. Disconnect all vacuum and air hoses connected to the check valve.
  2. Depending on the style, either unscrew or remove the fasteners holding the valve.
  3. Install and secure the new valve.
  4. Reconnect any vacuum and air hoses.
---------- This will help.Thanks.Helpmech.

Posted on Sep 17, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What is code PO410 secondary air injection

P0410 code is set when the air injection system does not blow air into the exhaust system. The monitor that runs and test the system is the Oxygen sensors. With the truck cold follow the air supply hoses to the exhaust check valves. The air pump is located by the heater box under the hood on top of fender well. The exhaust check valves are screwed onto the injection pipes that are connected to the exhaust manifold. remove these and test blowing into them air should only pass one direction (hose side to threaded side only) this is the most common failure. Pump should run on a cold engine and can be heard with hood open if not operating check fuses and relay okay then use jumper wires to test motor is should operate does not replace.

Nov 04, 2013 | 2001 Chevrolet Silverado

1 Answer

Code po410

P0410 - Secondary Air Injection System Malfunction
Possible causes- Faulty Vacuum hoses damaged
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
- Air bypass solenoid leaking/blocked or stuck open/closed
- Air diverter valve leaking/blocked or stuck open/closed

This is likely a pump problem caused by water being sucked into the secondary air injection pump under the hood.

Aug 29, 2012 | Chevrolet Cars & Trucks

1 Answer

Code 410

code po410 on a 2004 gmc envoy is that there is a problem with the secondary air injection system, you will need to check the fuse located in the engine compartment first, the next step is to start the truck cold and listen for the air pump to turn on for a few seconds, this will sound like a jet engine but not that loud, after it runs for 5 min and you dont hear it then you may have a bad pump which is located under the driverside on frame but if you hear the pump then you may have a bad valve, this valve is located on the exhaust manifold area and has a hose from the pump to valve, remove the hose and check for water, drain any water in the hose, also remove hose at pump and drain, the most common cause for this code is the valve is not opening and the air pump gets water inside and goes bad, thats the po410 code. a quick note; if fuse is blown look under truck near pump and check relay as it fills with water and blows fuse, if this is the case replace relay and blow water out of connector.good day.

Dec 06, 2011 | 2004 GMC Envoy

1 Answer

What is the code po410 secondary air injection system and what does it take to fix?

Note: There is a technical service bulletin (TSB) regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose. The TSB can be found on this ACDelco site.
Additionally, if you simply replace the AIR pump the problem may return again (and again). If you replace the pump, also clean out the hoses and replace the one-way check valve. If this is on a GM model that the TSB applies to, follow those instructions in the link above. In a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.
Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!
  • Replace the AIR pump AND one-way check valve
  • Test and clean the AIR pump AND test and replace the one-way air check valve
  • Replace the AIR pump inlet hose
  • Replace the AIR pump fuse (found under the hood)

Feb 06, 2011 | 2001 Chevrolet Blazer

1 Answer

The code po410 for the secondary air injection system is displayed. I check the pump and it is working fine. I can not locate the one way check valve to determine if it is working?

I believe the check valve is an internal component of the electric AIR shut-off valve. I assume this is a 4.2L as other engines do not have AIR.

Mar 03, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

I have a 2004 buick rainier and i,m getting a code po410

P0410 Secondary Air Injection System Malfunction
I am very familiar with this failure code, you are going to have to replace the secondary air injection pump, it has a failed motor in it, the code really indicates no airflow from the pump when commanded to be on.

May 28, 2009 | 2004 Buick Rainier

Not finding what you are looking for?
2004 Buick Rainier Logo

94 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8210 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides