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. 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? Codeword for secondary air system. Glad my LS3 doesn't have CAT's or an air pump. Thanks for that Danny / Jim. Zarboz, have you done this to your 540 yet? Bmw e46 secondary air pump vacuum line. 1992 525i 5-speed - Thread. Well the SAP diagnostic routine function as well as its existence impacts a few other REALLY important motor functions. Last edited by zarboz; 04-26-2019 at 07:21 PM. You get to lose some weight, remove a few potential sources of vacuum leaks, simplify the engine bay, and you don't have to hear a pump whining on every cold start. 1999 540 Auto with Eaton M112 supercharger. Glad I don't have one!
So realistically what are you losing out on here? 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. Yes, it's an emission thing. Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Euro byte for Secondary Air pump = 0. If you don't it will ruin the cats. 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. Richer dependent on load (rl) when starting from rest and adjustment to the lean performance limit (lalgm) from%ESWL, as described in%LAMKO. What am I doing to my motor. The SAP interacts with lambda tables and timers as well as interacting with catalyst heaters and heating function. Secondary air pump delete e46 air. 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. The SAP is pretty much there to please the emissions people, that's why plenty of countries don't have em. 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.
Switching off: No catalyst heating with MLSUS = 0 in%BBKHZ No Lambda action during lean warm-up: KFLMSKH = 1 with secondary air: MSLUB = 0 in%SLS and KFLASKH = 1. As a result just leaving the check engine light on (even making it be quiet through software was not enough). 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. Maybe some on the tops of the pistons too. Sent from my SM-G930F using Tapatalk. CWKONABG Altering from 5>1 is required (Explanation below). Some emissions issues at all? OBD2 scan shows no error for SAP either meaning I could pass emissions. Is this PURELY for emissions purposes? NO cel no nothing, quiet as a mouse. "0:no secondary air system, lean catalyst heating operation of the engine | 1: with secondary air system, rich catalyst heating operation of the engine ". Secondary air pump delete e46 motor. 5s, Sound Magus VS3500.
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. Takes a little extra key turn to get her on. Default selection in%ESWL such that "lalgm" does not limit lalgf during catalyst heating. Cold startup fuel enrichment is separate from Cat-preheating enrichment. 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 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 simply unplug the relay to the SAP air pump.
Then once a month read codes that are NOT SAP related. Sounds like a win/win to me. They cannot handle that much extra fuel without air on short trips, maybe it will burn off on longer runs. Lean warm-up: Default selection KFLMSKH with 1, 05, transition to 1, 0 resp. Or Lambda engine default selection by code word CWSLS in%SLS analogues to lean warm-up. Golden Gate Chapter BMW CCA Nr 62319. I figure I throw it on here for someone who interests in this mod. 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. Airlift 3H/P management, M5 steering box, M5 LSD, Eibach/Dinan front and rear anti roll bars, PM Modifich door boards, 4 Eton 6. I like to pretend I know stuff. 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).
1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan. Did you change the A/F on cold start? The SAP helps burn the rich mixture that is used during a cold start. The goal is to get the cats to work ASAP. I also deleted my SAP using a kit I bought from here. 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).
I have been driving with the relay removed for 4-5 years. 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. 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. Well I did the SAP delete on my 97-528 using a kit from someone here. 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. Some catalyst warming function during cold start. So zarboz must turn off the EXTRA richness for the SAP.
Give it a try and report back, of course it's now getting warm so it might work pretty OK. Your not that far from Pikes Peak, take it up there and let it sit for a few hours and see how it starts. 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).
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