ttw18

I found this part for a BMW. Do not know the anatomy of a BMW SAI system, but wonder if it could work on a Porsche.

http://store.bimmerworld.com/shared/...t=products.asp

993Porsche

You need a better link. Can't tell what part you're talking about.


Ken

Mike J

This is for deleting O2 sensors when modifying an exhaust system, but I doubt if it will fool the ECU on the O2 cycle needed for SAI.

User 122821

This is what you need

http://store.bimmerworld.com/Product870

It intercepts the signal from the O2 to the ECU when voltage is applied to the SAI pump. The connectors are different on the BMW but you can cut them off and splice it into the existing O2 connectors.

User 122821

Or you can make your own for $20

Mike J

The problem with the bimmer product is you have to slice into the wiring harness. i am working on another solution, totally plug and play...stay posted! Should be in the new year early spring..

Cheers,

Mike

Stealth 993

Mike, can't wait to see it!

jaholmes

Yeah, me too!

DryFly

Mike, No doubt your 'Plug 'n Play' will be for 'Targas' only!

Jeff96-993

I can't wait either. This would be a great winter project.

ReinerFink

I dunno -- all of those roof leaks might short out the electronics

-reiner

Mike J

Funny, its been raining like a bugger here, I left the Targa out in the driveway for a few weeks (daily driving) because the garage was occupied with another project, and no leaks, zero, zip, nada.

Of course, now I have jinxed it!

Cheers,

mike

User 122821

Great, thanks for telling now that I sliced up my wiring.

Only kidding, I splice it into the old O2 sensors which I need to replace anyways. I'm looking forward to your solution so it's more portable than my current setup.

g_murray

I might have some input here.

I plugged in my OBD-ii reader and turned on the ignition - but didn't start the engine. Of course I could then hear the air pump puffing away to its heart's content.

Both downstream O2 sensors were showing 0.45 V -- which is the normal signal that you get when both catastrophic converters are 'working efficiently'. If both cats are 'bad' or there is a problem with the gasses that are blowing by -- these downstream O2 sensors usually start showing a HIGHER voltage, e.g. .8 to .9V

Well, now that my NY inspection is a thing of the past (i.e. last Sept. - so now I'm not too worried if I trip a CEL) -- my next trick will be to remove the relay that controls the SAI pump - disabling it from running -- and seeing if that has any effect on the voltages of the two downstream O2 sensors.

Stand by, as they say.

Gerry

g_murray

Update:

I could not find the appropriate fuse or relay for the SAI air-pump - so I just wiggled my hand in - and disconnected the electrical connection which is that long wire to the left of the air-pump itself - just above the distributors.

Sure enuf - when I did 'ignition on' - the air pump did NOT come on. So far so good.

I had my OBD-ii reader connected and took a looksee at the voltages of the (downstream) O2 sensors. Dahyum -- both showed .45V -- so, for all practical purposes there appears to be no 'obvious' difference (ignition on / engine off) inasfar as the O2 sensors are concerned - if the pump is running or not.

Oh well, back to the drawing board...

G.