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). Give it a try and report back, of course it's now getting warm so it might work pretty OK. The base point distribution of KFLMSKH, KFLASKH is to be chosen such that the "catalyst heating idle range" is sufficiently covered with regard to engine speed and load at idle and that a steady transition by interpolation to partial load can be performed. When starting a cold engine, especially in the winter, on a leaner A/F mixture it won't run that well until it warms up. Is this PURELY for emissions purposes? The SAP helps burn the rich mixture that is used during a cold start. Euro byte for Secondary Air pump = 0. Takes a little extra key turn to get her on. If you ONLY disable the SAP in the ESKONF file and make no changes to the cat heater operations the car stalls out on first cold start of the day. Cold startup fuel enrichment is separate from Cat-preheating enrichment. Lean warm-up: Default selection KFLMSKH with 1, 05, transition to 1, 0 resp. 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. Secondary air pump delete e46 valve. Or Lambda engine default selection by code word CWSLS in%SLS analogues to lean warm-up. 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 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). 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 | | | | +-------- | | | | +---------- | | | +------------ | | +-------------- | +---------------- |. 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. As a result just leaving the check engine light on (even making it be quiet through software was not enough). Some catalyst warming function during cold start. 1992 525i 5-speed - Thread. 1999 540 Auto with Eaton M112 supercharger. Bmw e46 secondary air pump vacuum line. Codeword for secondary air system. 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.
Some emissions issues at all? SO I had to 00 out other items in order to get the SAP system to truly be "deleted" from the cars ecu functions. Did you change the A/F on cold start? Secondary air pump delete e46 4. Maybe some on the tops of the pistons too. To get my SAP code to not be thrown on the dash anymore I did the following: This yielded me no error for SAP activation (it is unplugged and block plated off now) and I get no error after cold start for SAP. Yes, it's an emission thing.
I also deleted my SAP using a kit I bought from here. 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. Well I did the SAP delete on my 97-528 using a kit from someone here. Richer dependent on load (rl) when starting from rest and adjustment to the lean performance limit (lalgm) from%ESWL, as described in%LAMKO. With the normal A/F about the only negative I can think of other than possible CAT issues would be the back sides of the exhaust valves may get more carbon deposits on them. This heats the CAT's up quicker along with the pre-CAT O2 sensors. 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. The goal is to get the cats to work ASAP. 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. Sounds like a win/win to me. 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. They cannot handle that much extra fuel without air on short trips, maybe it will burn off on longer runs.
OBD2 scan shows no error for SAP either meaning I could pass emissions. OK so you're probably wondering whats going on right? 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 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. Must also help the bigger secondary CAT's too. 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. 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? The SAP interacts with lambda tables and timers as well as interacting with catalyst heaters and heating function. I like to pretend I know stuff. Last edited by 16valex; 05-03-2019 at 01:44 PM. Glad I don't have one!
The SAP is pretty much there to please the emissions people, that's why plenty of countries don't have em. I have been driving with the relay removed for 4-5 years. 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. I simply unplug the relay to the SAP air pump. CWKONABG Altering from 5>1 is required (Explanation below). Sent from my SM-G930F using Tapatalk. Golden Gate Chapter BMW CCA Nr 62319.
It has been working flawlessly for 4 years now. 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. 1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan. NO cel no nothing, quiet as a mouse. I figure I throw it on here for someone who interests in this mod. This the kind of kit that connects to the 02 sensors I bought this simulator from a vendor here at bimmer. Zarboz, have you done this to your 540 yet? Glad my LS3 doesn't have CAT's or an air pump. 5s, Sound Magus VS3500.
Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Last edited by zarboz; 04-26-2019 at 07:21 PM. Thanks for that Danny / Jim. If you don't it will ruin the cats.
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