Secondary Air Injection Veterans needed

[Smallblock454]

The Mercedes EGR valve seems to be different (besides the 90 degree turned fitting). Not shure if that works.

Also it has different part number from Denso - 135200 - 0360



I found an OEM one for 40 euros on ebay Germany: Porsche 996 986 Boxster Umschaltventil Abschaltventil 99311324501 Control Valve | eBay

Regards, Markus

[particlewave]

Nice Gelb! Thanks for the links

Originally Posted by Smallblock454

The Mercedes EGR valve seems to be different

No, it's the same thing.

The SAI changeover valve is simply an on/off vacuum controlled normally closed airflow valve...nothing special about it. The Merc valve does the same thing, has the same size fittings, even the same mold marks. Part #'s are irrelevant. They are the same valve.

Though the specs are identical, I'll go ahead and post up pictures, measurements and results when I replace it.
Thanks Markus!

[Vidyashankara]

Hey guys, Sorry to bring up this old post.

I have the same problem with the SAI system. Both P1410 and 1411 codes are on. The OEM check valve and change over valves are expensive.

Particlewave, I know you confirmed the Mercedes MTC3095 was a perfect fit for the check value in 986. Can you confirm if the mercedes part for the change over value is also a good fit? The part looks different. How did you make it fit? Do you have pictures you can share?
NEW MERCEDES AIR VALVE 380SLC 380SEL 380SL 380SEC 420SEL 190E OE # 000-140-77-60 | eBay


Also, any update on your little hack on fooling the DME during cold starts? do you have it up and running?

[Boxstard]

Originally Posted by Vidyashankara

Hey guys, Sorry to bring up this old post.

I have the same problem with the SAI system. Both P1410 and 1411 codes are on. The OEM check valve and change over valves are expensive.

Particlewave, I know you confirmed the Mercedes MTC3095 was a perfect fit for the check value in 986. Can you confirm if the mercedes part for the change over value is also a good fit? The part looks different. How did you make it fit? Do you have pictures you can share?
NEW MERCEDES AIR VALVE 380SLC 380SEL 380SL 380SEC 420SEL 190E OE # 000-140-77-60 | eBay


Also, any update on your little hack on fooling the DME during cold starts? do you have it up and running?

I fixed my SAI last winter, not knowning cheaper MB parts... That changeover valve should work, only the difference is the 90-deg orientation of small nipple but you will be fine with enough length silicone hose.

Did you check if the vacuum reservoir is holding vacuum and the solenoid switch is functioning to apply vacuum to the changeover valve?

This winter I noticed that my SAI motor was running erratically and got CEL... but it was just a fuse on its last leg... New fuse was all it took.

Good luck!

[Vidyashankara]

Originally Posted by Boxstard

I fixed my SAI last winter, not knowning cheaper MB parts... That changeover valve should work, only the difference is the 90-deg orientation of small nipple but you will be fine with enough length silicone hose.

Did you check if the vacuum reservoir is holding vacuum and the solenoid switch is functioning to apply vacuum to the changeover valve?

This winter I noticed that my SAI motor was running erratically and got CEL... but it was just a fuse on its last leg... New fuse was all it took.

Good luck!

Hey! I havent diagnosed any of the parts as yet. Just that I get P0410 and P1411. Once the weather gets warmer, I will start pulling things around and seeing what needs to be replaced. The pump starts up and turns off after a couple of mins, so that should be good.

[boxfix]

Originally Posted by Boxstard

I fixed my SAI last winter, not knowning cheaper MB parts... That changeover valve should work, only the difference is the 90-deg orientation of small nipple but you will be fine with enough length silicone hose.

Did you check if the vacuum reservoir is holding vacuum and the solenoid switch is functioning to apply vacuum to the changeover valve?

This winter I noticed that my SAI motor was running erratically and got CEL... but it was just a fuse on its last leg... New fuse was all it took.

Good luck!

I had a bad vacuum reservoir they are only 20.00 or so. easy to test with a hand vacuum pump. They make these in 2 pieces and glue it together. It should be roto molded. You can buy metal ones from Summit Racing.

The solenoid valves are the same in many German cars.

[Boxstard]

Originally Posted by boxfix

I had a bad vacuum reservoir they are only 20.00 or so. easy to test with a hand vacuum pump. They make these in 2 pieces and glue it together. It should be roto molded. You can buy metal ones from Summit Racing.

The solenoid valves are the same in many German cars.

Reservoir was my initial suspect, read it is a typical failure mode, but mine was fine.

After all my changeover valve was shot, inside diaphragm was totally deteriorated, same with the check valve, rubber diaphragm was gooey.

Yes, the solenoid valve is commonly available, made by Pierburg. I bought the same one cheap to rig up actuation of my PSE valves.