Secondary Air Pump DIY help

[Meestahbig]

Hi. 2003 X5 3.0i So I'm back again asking about how to get the old one out and a new one in. Wife is going to make me sell the car unless I fix it. Screams like hell for a minute and then settles down. I see they got aftermarket pumps now for like $70. I know it's a cheap piece of crap, but it will get me through. How do I access the bolts and nuts to remove the damn thing.

[bcredliner]

Originally Posted by Meestahbig

Hi. 2003 X5 3.0i So I'm back again asking about how to get the old one out and a new one in. Wife is going to make me sell the car unless I fix it. Screams like hell for a minute and then settles down. I see they got aftermarket pumps now for like $70. I know it's a cheap piece of crap, but it will get me through. How do I access the bolts and nuts to remove the damn thing.

Hope this helps, there are other videos about same subject to choose from if it doesn't. https://www.youtube.com/watch?v=BFVQ5Q6nAco

[cn90]

Ha,

- I live in a state w/o emission inspection, so I pull the Air Pump Relay and read the CEL codes 3-4 times a year.

- Don't buy the Chinese stuff, you WILL regret.
Get the Pierburg for $170 or so:
https://www.fcpeuro.com/products/bmw...437911#fitment

- Tons of DIY in forums, look at E39 forums...just a few nuts and it is out...

[Meestahbig]

To be honest. I am not worried about emissions. I just passed inspection today. I have a obd 2 tool and can clear the code. In theory I could warm up the car, clear the code and then go pass emissions with the car warm. I just wonder then if the light is already on, I won't know of new sht pops up.

Is there anything else I need to move or remove to get the pump out?

I wonder if there is a way to hook up something else that would just trick the system to thinking the pump is there. Something like a coil with similar eaiatwnace to the pump motor.

[cn90]

Since I pulled the Air Pump Relay, this is what I do:

- Cover the CEL with a small piece of black electrical tape.

- I have a cheap Maxi OBD-II scanner ($15 online). I have a notebook in the car, every month I scan for new codes and put a check mark so I know I already checked new codes for let's say Aug 2020.

- For the last 5 yrs, no new codes show up.

[Meestahbig]

I like that... no more whistling.

[andrewwynn]

The motor takes a crap load of power. You'd not be able to pull enough power to simulate it and it wouldn't work anyhow.

When wife's SAP failed we dealt with the "Vertical take off simulation" sound for about 8 months until it stopped pushing enough air and the computer figured out from O2 sensors I believe that the SAP wasn't pushing enough air.

Somebody gave me an sap from a 7-series or 5-series and I was able to adapt it to fit by adding some screw holes and cut a little bit of clearance so it didn’t touch the trim under the right headlight. I would look for a used one that maybe came from a 2005-6. But doesn't need to be e53 so you get a much bigger base

[gpeterson]

Originally Posted by Meestahbig

I wonder if there is a way to hook up something else that would just trick the system to thinking the pump is there. Something like a coil with similar eaiatwnace to the pump motor.

Yes - I've been selling SAP sims for BMWs for years. You don't need to simulate the pump's current draw, but the DME expects a few other things when the pump should be running to prevent a CEL/codes.

[andrewwynn]

That's good to know. Link? Price?

[gpeterson]

Originally Posted by andrewwynn

That's good to know. Link? Price?

e36-electronic.com - BMW SAP, O2 sims and DME flashing

$75 or $170 depending on if you want to splice wires of just plug in. It started as E36 only but I can make one or any OBD2 BMW with narrowband pre-cat O2 sensors S/M52 (including tu), S/M54, S/M62, etc. Some cars have a SAP MAF that I'm 90% sure how to deal with but haven't worked with anyone on testing yet.

I'm also considering a newer design that would live in the DME box and be wired by re-pinning a few DME connectors. That could be built at a lower cost than the plug & play models. I may prototype that now that I have an E46 (M54) and E53 (M62tu) at home.