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Secondary Air Pump Delete E46 4

1999 540 Auto with Eaton M112 supercharger. The engine runs EXTRA rich when the SAP runs so that the unburnt fuel can be burnt in the cat with the air from the SAP. There's no real harm in deleting it if you block it off properly and code it out correctly (which plenty of reputable tuners like DUDMD will do as part of a tune). Some catalyst warming function during cold start. NO cel no nothing, quiet as a mouse. Euro byte for Secondary Air pump = 0.

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It has been working flawlessly for 4 years now. Your not that far from Pikes Peak, take it up there and let it sit for a few hours and see how it starts. Takes a little extra key turn to get her on. If it is enabled then it injects more fuel during startup routine to make cats reach operating temp faster.. the really long technical looking snippet right before my inquiry is a snippet from the software data guide. Long explanation below: By the bit B slsfz from CWKONABG the catalyst heating concept without / with secondary air system becomes compatible: B slsfz = | 0: no secondary air system, lean catalyst heating operation of the engine | 1: with secondary air system, rich catalyst heating operation of the engine Further possible secondary air variations are described in%SLS.

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I was more just curious what negatives I am looking at other than emissions and slower catlyst warming on cold start due to leaner fuel conditions. Sounds like a win/win to me. I simply unplug the relay to the SAP air pump. 0Code:bit 7 6 5 4 3 2 1 0 +---------------+ x| CWKONABG |x +---------------+ | | | | | | | +-- B katfz | | | | | | +---- B kath | | | | | +------ B slsfz <<< defining byte for is the SLS system installed in the car | | | | +-------- | | | | +---------- | | | +------------ | | +-------------- | +---------------- |. The reports are in: If you disable all the routines that check the cat heater the car turns on and runs just fine on COLD start (like 28 degrees outside). I have been driving with the relay removed for 4-5 years. Codeword for secondary air system. Rich warm-up: Default selection KFLASKH with 1, 1 to 1, 2, transition to > 1, 3 when starting from rest and adjustment to the lean performance limit (lalgm) from%ESWL, as described in%LAMKO.

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What am I doing to my motor. Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. "0:no secondary air system, lean catalyst heating operation of the engine | 1: with secondary air system, rich catalyst heating operation of the engine ". Did you change the A/F on cold start? They cannot handle that much extra fuel without air on short trips, maybe it will burn off on longer runs. Yes, it's an emission thing. I was purely going off what the guide for the software in our DME says.. basically is saying if it reads that the SAP is disabled by that binary bit it changes the startup method to inject less fuel during warmup routine only. Must also help the bigger secondary CAT's too. This heats the CAT's up quicker along with the pre-CAT O2 sensors. SO I had to 00 out other items in order to get the SAP system to truly be "deleted" from the cars ecu functions. Last edited by zarboz; 04-26-2019 at 07:21 PM. Lean warm-up: Default selection KFLMSKH with 1, 05, transition to 1, 0 resp. Cold startup fuel enrichment is separate from Cat-preheating enrichment. Merely unplugging the SAP and blocking it off is an option and would yield a check engine light amongst a few other problems that are not as aparrent until the functions of the DME are described.

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Last edited by 16valex; 05-03-2019 at 01:44 PM. CWKONABG Altering from 5>1 is required (Explanation below). Please be forgiving I am not really a mechanicly minded person I work with computers all day so I get what the datasheet is saying that it aids in the warming of the catalysts via exhaust at a more rapid rate. Or Lambda engine default selection by code word CWSLS in%SLS analogues to lean warm-up. Thanks for that Danny / Jim. So realistically what are you losing out on here? So zarboz must turn off the EXTRA richness for the SAP. Well the SAP diagnostic routine function as well as its existence impacts a few other REALLY important motor functions. The SAP is pretty much there to please the emissions people, that's why plenty of countries don't have em. Glad my LS3 doesn't have CAT's or an air pump. OK so you're probably wondering whats going on right? So in my adventures of learning how to tune my car I wanted to track down DTC definitions (I have all of them I think) and that required some testing. The goal is to get the cats to work ASAP.

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I actually planned on going up to the mountains this weekend hopefully its chilly enough to get a real life result from this change test to see how it impacts fuel on start in a real world application. I have sufficiently coded the SAP out of the DME portion via the 64kb mapping tables myself a I have talked with a few dudes online in Russia who are familiar with our DME and all 4 of them gave me different methodologies and reasonings why the other guy was missing X function or why Y function was important to 00 out as well it was pretty easy to figure out once i had some data sheets. Zarboz, have you done this to your 540 yet? Sent from my SM-G930F using Tapatalk. Is this PURELY for emissions purposes? The SAP helps burn the rich mixture that is used during a cold start. Then once a month read codes that are NOT SAP related. As a result just leaving the check engine light on (even making it be quiet through software was not enough).

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This topic and associated thread explains a lot about it (for the e46 M3): When the car is started and the DME thinks the cats are cold, it will enable the SAP, inject extra fuel and retard the timing (and change some VANOS settings if applicable). Long explanation below the TLDR is here: MSLUB and MSLBAS are expected return values for the SAP pump CWKONABG tells the car that the SAP is not installed and to treat the kats differently the CLA* items silence the check engine light because the pump is unplugged. Glad I don't have one! Give it a try and report back, of course it's now getting warm so it might work pretty OK. 1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan. 5s, Sound Magus VS3500. 1992 525i 5-speed - Thread. This the kind of kit that connects to the 02 sensors I bought this simulator from a vendor here at bimmer. I also deleted my SAP using a kit I bought from here. Maybe some on the tops of the pistons too. I don't see any cold start problems but as my car has a jag charger now and has had some fuelling changes I don't know how that has changed things. Airlift 3H/P management, M5 steering box, M5 LSD, Eibach/Dinan front and rear anti roll bars, PM Modifich door boards, 4 Eton 6. Default selection in%ESWL such that "lalgm" does not limit lalgf during catalyst heating.

Golden Gate Chapter BMW CCA Nr 62319. Well I did the SAP delete on my 97-528 using a kit from someone here. I like to pretend I know stuff. If you don't it will ruin the cats. I was speculating that this richness is purely during "warmup function" which i would imagine the SAP dumps air + Gas to the cats to get them up to operating temp as fast as possible in case of a cold start emissions test?

Tue, 11 Jun 2024 15:24:13 +0000