P0410 Secondary Air Injection System Cylinders 1 – 3

[hancock1701]

Hey guys,

I posted a thread about the same code, P0410. I saw and followed Jager's thread about cleaning the passages on the exhaust side. I didn't take any pictures, but my bank 1 looked just like his pictures. One cylinder was actually clogged and isolated. I cleaned them the best I could, but I couldn't reach far enough to clean the upstream of the passages. It took about an hour to do the actually job, and about $30 in gaskets. I just want to say thank you to Jager for posting this thread, and hopefully the code will not come back anytime soon!

[Jager]

Originally Posted by hancock1701

Hey guys,

I posted a thread about the same code, P0410. I saw and followed Jager's thread about cleaning the passages on the exhaust side. I didn't take any pictures, but my bank 1 looked just like his pictures. One cylinder was actually clogged and isolated. I cleaned them the best I could, but I couldn't reach far enough to clean the upstream of the passages. It took about an hour to do the actually job, and about $30 in gaskets. I just want to say thank you to Jager for posting this thread, and hopefully the code will not come back anytime soon!

I'm glad this thread helped... Did you clean both sides?

[hancock1701]

Originally Posted by Jager

I'm glad this thread helped... Did you clean both sides?

It sure did. I cleaned both sides. However, I didn't pump Seafoam in and scrub it like you did. I sprayed carb cleaner, and tried to scrub it, but my brush couldn't reach that far. Now that I think about it, I could have done an even better cleaning job, although this is already much better than before it got cleaned. Anyway, we'll see if the code comes back again, and how long it will stay unclogged. Thanks again!

[san rensho]

Jager- I thought the O2 voltage before the cat was supposed to be a sine wave and the voltage behind the cat was close to a straight line.

[Jager]

Originally Posted by san rensho

Jager- I thought the O2 voltage before the cat was supposed to be a sine wave and the voltage behind the cat was close to a straight line.

When the Secondary Air Injection pump is running the O2 sensor voltage in front of the cats should be flat (low voltage). After the SAI pump shuts off you will see the sine wave.

[Gelbster]

Originally Posted by san rensho

Jager- I thought the O2 voltage before the cat was supposed to be a sine wave and the voltage behind the cat was close to a straight line.

I'll answer because this helpful Thread is linked in an another Active SAI problem solving Thread.
Yes , the O2 V ahead of the Cats should be a sine wave but only after the SAI Pump has stopped (90 seconds max on a cold start)

The effect of a correctly functioning SAI system is to pump in so much extra air(O2) before the Cat ,that the excess HC is burned off. This temporarily smooths the sine wave.
The problem is to see this on Durametric. You need a fast laptop on 110v power to be fast enough to connect and see the graphs for both banks simultaneously - look for Voltage ahead of Cat.
If the diagnostic tool is active before the cold start, you will see the sine wave momentarily before the air from the SAI pump reaches the exhaust. I can't figure out how to do this with Durametric but it would be a useful diagnostic technique if someone else can explain how to do it.
I am not an expert on this so please correct if necessary for accuracy.