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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, May-10-2019, 11:02:08 PM   #1
Turb02
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Default Cold start misfires. cant disable extra fuel at start

Im lost. Not sure why its not working.

Ive searched.

Ive also used Martyns Binary modification tool to disable SAP and cat heating. (To be honest, the tool isnt enabling my shift lights, no matter how many times I try to use it to set them)

Ive changed, using TunerPro, K_TI_TMOT_KS from 60 to -40, as outlined in other cold start delete threads.

AFRs drop to 10 at cold start (probably due to my AFD E85 kit) but even when its not connected I still get the misfires.

Car runs great otherwise.

Please Halp.
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Old Sat, May-11-2019, 12:35:14 AM   #2
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Default Re: Cold start misfires. cant disable extra fuel at start

ALright, in my last ditch effort Ive also done:

Scalar: K_KATH_NMAX changed from 4500.00 "Upm" (0x1194) to 0.00 "Upm" (0x0000).
Scalar: K_TI_TMOT_HS changed from 130.00 "ýC" (0xB2) to 207.00 "ýC" (0xFF). (This would not accept 266.)
Scalar: K_SLS_OBD changed from 1.00 "-" (0x01) to 0.00 "-" (0x00).
Function: KL_KATH_T_AKTIV from values to 0s.

Ive flashed the car with this BIN and it started, but its not completely cold, so I cant say whether or not it will fix my super rich, misifring, cold starts.


Anyone with input is more than welcome to point me to where I went wrong or to a step I missed.

Thanks
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Old Sat, May-11-2019, 03:43:52 AM   #3
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Default Re: Cold start misfires. cant disable extra fuel at start

I recommend leaving K_TI_TMOT_HS stock. That has to do with hot starts, not cold starts. And don't mess K_TI_TMOT_KS either. Some cold start enrichment is expected and proper.

The cat heating values that you changed are sufficient.
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Old Sat, May-11-2019, 02:29:58 PM   #4
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Default Re: Cold start misfires. cant disable extra fuel at start

Quote:
Originally Posted by terraphantm View Post
I recommend leaving K_TI_TMOT_HS stock. That has to do with hot starts, not cold starts. And don't mess K_TI_TMOT_KS either. Some cold start enrichment is expected and proper.

The cat heating values that you changed are sufficient.
That's my point. They don't appear to be.

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Old Sat, May-11-2019, 02:33:26 PM   #5
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Default Re: Cold start misfires. cant disable extra fuel at start

You can try pulling some from KF_TI_N_RF_WL which should be the warming enrichment
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Old Sat, May-11-2019, 07:39:19 PM   #6
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Default Re: Cold start misfires. cant disable extra fuel at start

I reverted the TI_TMOT_KS/HS back to factory before I started it this morning and it still went super rich. My gauge only reads to 10 on the low side...so.

Also still have the "incomplete" readiness for my SAP. I thought changing the 1 to 0 would either set it to N/A or set it to ready?

No pending misfires after startup even though there was a slight stumble, but I still want to remove the enrichment altogether.

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Old Wed, May-15-2019, 02:51:38 PM   #7
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Default Re: Cold start misfires. cant disable extra fuel at start

Quote:
Originally Posted by exodus454 View Post
You can try pulling some from KF_TI_N_RF_WL which should be the warming enrichment
Im still trying to learn the automotive coding piece...what does the Y Axis represent in this table?


Ive Changed the "KL_TI_TMOT_VSP" values to the following then cleared the DME error codes
[tmot *C] - [ti factor]
-30 3.000
-20 3.000
-10 3.000
00 2.500
20 2.500
30 1.100
40 1.000
70 1.000

But this morning, my AFR still landed on 10 for most of the warmup.
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Old Thu, May-16-2019, 09:55:40 PM   #8
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Default Re: Cold start misfires. cant disable extra fuel at start

Quote:
Originally Posted by exodus454 View Post
You can try pulling some from KF_TI_N_RF_WL which should be the warming enrichment
So I globally lowered those values by 5. By that I mean, if there was a number .45, its now .40.


Not sure if thats what you meant by "pulling some". I havent loaded it to the car yet, so if someone or @exodus454 can say thats the correct way to "pull some", Ill flash the bin to my car and report back tomorrow.
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Discussing Cold start misfires. cant disable extra fuel at start in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)