thanks for everyone. i getting a check engine light with a diagnostic code of P0410 (Secondary air injection system) but alredy changed the air injection valve and SAI also reset the check engine light. But the engine light still come up. Do you guys think I'm missing something?

THANKS for your help

 

so you changed #11 also?

 

A 410 code indicates an electrical problem. Check for signal at connections. Check fuse, relay, changeover valve triggger as well as if pump works when fed direct current.

 

redridge thanks for you help i also changed #11 #1 #3 #5 but the check light
still come up

 

wow, you changed #1... upon start up, can you verify that it has turned on? (It sounds like a vacuum cleaner, Open the hood and you can feel (vibration) that it is on. After a minute or so... it will shut off. If it doesnt... we'll have to go to the schematics.

 

So, was it your idea or your mechanic's idea to just start replacing hundred of dollars in parts before diagniosing your problem? Sounds like a Porsche Technician. The SAI is a very simply system and each and every componant can be easily verified as to whether it is working or not. You say you changed the air pump. Have you confirmed it even works after installed?

Often, these codes are caused because the vacuum line from the vacuum reserve is not connected. It can also be an electrical problem with the changover valve, or a bad air changeover valve. The vacuum line for the electric changeover valve is so small that identifying it as a vacuum leak with a vacuum gauge is difficult. You codes indicate that both banks are experiencing probelms so it is probably a single, main componant.

Here is what I would do. Assuming that the pump is working.

With the engine running, remove the vacuum line for the electric changeover valve that goes to the vacuum reserve canister. There should be constant vacuum. If not, the other end of the hose is disconnected and your air changeover valve will not open.

Next, on a cold engine, remove the other vacuum line from the air changeover valve. Start the car, at which time the pump should start. You should be getting a vacuum in the disconnected line until the pump shuts off. If not,. problem is with the electric changeover valve.

On the other hand, you can immediately jump to the end and remove the larger hose from the non return valve. On a cold engine, the pump should start and there should be air blowing out of the hose. When the pump shuts off, the blowing will stop completely and NO AIR should be coming back out of the valve. If this is the case, then you can safely assume that everything before this point back to the pump is working as designed.

The function of the system is simple. There is constant vacuum to the electric change over valve to which a vaccum line to the air valve is connected. When off, the electric changeover valve does not allow vacuum to get to the air valve. When on, (pump running) the valve activates and allows vacuum to get to the air valve and allows air to pass into the manifold through the one way valve.

 

BTW just to help eliminate some causes, it could be both electrical or mechanical for this fault, the reading for secondary air pump operation comes from the oxygen sensors and is compared against a known value, this fault is for below value, so either there is a blockage or a valve not opening,and P0410 is bank 1 specific, so the eliminates a lot of the system, air pump,vacuum resevoir line connection,, make sure there isnt a piece of carbon or something stuck in 12 or in the connection to the head also.

 

thanks for your help redridge. The problem is vacuum hose. now i fix up ready the light not come up again. thank you

 

thank you porsche 917

 

thanks for your help. 1999porsche911 no more problem now thanks!!!