Throttle tip-in issue/stumble (3.0 5-speed)

[Happy]

Originally Posted by paramax55

You can do a search for e53… that will keep you up past your bedtime.

Oh man.. How many times have I been here! LoL…


E53 RiPPeR
XOuTPoST jUNkiE
ReVELaTiON 22:21

[Masospaghetti]

Originally Posted by paramax55

My X5 5-speed does the exact same thing. I've never tried to fix it because I know the cause and I've just never felt it worth the trouble to fix it. It's the off idle tip-in map.

I've had two e30s that did this exact same thing in the past. The first car was just an eta and it drove me crazy. I figured it was just an old car and running bad. When it was wrecked, I bought an "i" car and used the tranny from the eta to make the newer one a 5-speed. It had the same off-idle problem so I knew it was a BMW thing. I turbo'd it and put in big injectors, so I was forced to remap it. I used a Moates eeprom emulator and free software (I don't remember the name). But the definition file called the map "throttle enrichment" or something like that. Once I fixed that map, it was smooth as silk.

Any recollection what the table name was? Now that i'm in TunerPro there are approximately 5 billion tables, many without good descriptions or titles. Did you end up just increasing the values in the table incrementally to smooth it out?


Edit: Are they these tables? These are for warm engine. There are three additional for cold engine.

• ip_tco_2_pl_ivvt_1__n__maf (Injection time used for bank 1 during part load. Warm engine)
• ip_tco_2_pl_ivvt_2__n__maf (Injection time used for bank 2 during part load. Warm engine)
• ip_ti_tco_2_is_ivvt__n__maf (Injection time used during idle. Warm engine)

These also sound possible:

• ip_tib__n__maf (Basic injection time)
• ip_ti_wup__n__maf (Warm up correction for injection time)

Edit 2: Found some documentation on the MS4X website about "Tip-In Enrichment / Cylinder Rewetting" with the note at the end, "Applying 5% steps to the whole table ip_ti_pvs__pvs__n in either direction shows good results". I'm probably going to try tweaking this table and see what happens.


I also got a copy of TSB B 12 39 06 (which supercedes B12 204 04) and it only applies to production dates 10/3 - 10/4. Mine was built 09/3 and therefore the bulletin doesn't apply.

[Masospaghetti]

Here goes the rabbit hole...found another thing that might do it:

• Anti-jerk "_AJ_" retards ignition during rapid throttle opening to smooth out torque (can be removed by increasing c_tco_min_aj to 142.5C).

I was surprised how easy it was to upload the new maps to the car using MS4X. Was expecting some errors and troubleshooting but it worked right away.


For the record, I did go ahead and replace the fuel pump with a new Carter unit. It seems "somewhat better" (although I've learned that when a problem isn't totally fixed, any improvement is usually a placebo).

[andrewwynn]

Does the pressure stay the same when hitting the throttle? After i replaced FPR the rail pressure was constant no matter what.

[Masospaghetti]

Originally Posted by andrewwynn

Does the pressure stay the same when hitting the throttle? After i replaced FPR the rail pressure was constant no matter what.

Yes, I did check it after the FPR was replaced and it was completely steady.

[80stech]

Another work around you could try is to pull up/down with a resistor the air charge temp sensor in the intake to make it look like the air is a bit cooler than it really is. The DME looks at that for "tip in" fuel amount. That being said I finally got my temp gauge problem fixed by cleaning the connector in the E-box, I might be imagining it but my tip-in throttle response seems better too!