Question about 2004 Buick Rainier
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.
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
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Posted on Jan 02, 2017
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
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
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 check valve keeps hot exhaust gases from backing up into and ruining the air pump. To Replace the Air Pump Check Valve
--------------- 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
Posted on Sep 17, 2011
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