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Title: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on July 29, 2013, 03:44:46 PM hy there! i have an audi TT 1.8T ajq 180hp and the ecu got toasted(8n0906018A)..so i upgraded to wideband ecu and lambda(06a906032HN)...coded out the vvt ,n112 and the rear o2,.BUT!got very bad idle stft and LTFT...10 stft and 25 ltft...and high inj time..
got the p1128 FUEL TRIM Bank 1(mult) :system too lean and the p1136 FUEL TRIM Bank 1(add) :system too lean NEXT I adjusted the MAF maps from my A-tune TO my 032HN ecu(kfkhfm mlhfm)also the tvub, krkte,but left the FKKVS ALL 1 .but still..7.9stft and 23ltft...i also made some logs...if someone is willing to help...i would appreciate! thanks in advance! Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on July 29, 2013, 03:51:54 PM Forgot to mention...NO LEAKS....
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: Carsinc on July 29, 2013, 08:40:28 PM Did you change to a wide band MAF? If not thats the problem.
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on July 30, 2013, 06:41:13 AM no..the maf is 06a 906 461C...but i copied the (MLHFM) Linearization of MAF voltage and the (KFKHFM) Maf sensor correction by load and RPM from my 8n0906018A to 06a906032HN ecu...
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on July 30, 2013, 08:57:08 AM even if i unplug the maf...the same trims and inj time i get...
nobody knows? Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: Carsinc on July 30, 2013, 06:12:58 PM I can't explain why the trims go bad with the maf unplugged.
But the wide band cars use a different maf than narrowband. I've ran into this with TT. Do a little research about with maf you need. IF the part # on the sensor itself bosch# not vw ends in 040 its narrow band 049 is wide band. Try a windband maf and let it adpt. Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on July 31, 2013, 03:19:34 AM that i understood..but why the same behaviour even with the maf unplugged...?!
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on July 31, 2013, 03:21:29 AM also..block 033 (pre-cat o2 sensor) ...only fluctuates for 3-4 sec after i reset the trims...it goes -1.6 1 ...and after a few seconds it goes between 18% - 22% and stays there....maybe it's something related to this?!
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: IamwhoIam on July 31, 2013, 08:05:08 AM Are you 1000000% sure that the car is ok hardware-wise????
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: vagenwerk on July 31, 2013, 11:45:53 AM try leaving tvub stock ;)
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on August 01, 2013, 07:28:30 PM same results...even with stock TVUB...
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: IamwhoIam on August 02, 2013, 06:05:19 AM Are you 1000000% sure that the car is ok hardware-wise ? ? ? ?
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on August 02, 2013, 12:24:59 PM @IamwhoIam ...what do you mean by hardware - wise?..
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: IamwhoIam on August 02, 2013, 04:05:13 PM Are you 10000% positive that there are no boost/vacuum leaks on the car? that the MAF is recent for instance?
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: Carsinc on August 02, 2013, 06:23:42 PM Please try the maf like I have recommended.
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on August 02, 2013, 06:38:15 PM @IamwhoIam Yes...100% positive no boost\vacuum leaks...i went to AUDI SERVICE and they double checked...
@Carsinc :still don't get it why bad trims even with maf unplugged..btw: i have this maf:06a 906 461C (0280218023) ...i need the AUM/AUQ one?06a 906 461L ??? can it be a faulty new 02 sensor?....cause i told you...block 033 (pre-cat o2 sensor) ...only fluctuates for 3-4 sec -1.6/1.2/-1.2/1.3 after i reset the trims.and after a few seconds it goes between 18% - 22% and stays there... THANKS ALL FOR CONTRIBUTING! Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: userpike on August 04, 2013, 08:58:43 PM @IamwhoIam Yes...100% positive no boost\vacuum leaks...i went to AUDI SERVICE and they double checked... @Carsinc :still don't get it why bad trims even with maf unplugged..btw: i have this maf:06a 906 461C (0280218023) ...i need the AUM/AUQ one?06a 906 461L ??? can it be a faulty new 02 sensor?....cause i told you...block 033 (pre-cat o2 sensor) ...only fluctuates for 3-4 sec -1.6/1.2/-1.2/1.3 after i reset the trims.and after a few seconds it goes between 18% - 22% and stays there... THANKS ALL FOR CONTRIBUTING! Are you certain your fuel pump isn't weak or the FPR malfuntioning? Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: vagenwerk on August 05, 2013, 03:10:54 AM unplug maf , then reset fuel trims to 0% , and check short term fuel trim idle and during ride
Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on August 05, 2013, 01:40:28 PM @userpike fpr and fuel pump was checked:(...
@ gregor10 ...7.9 % and...25% Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: player on August 05, 2013, 01:42:39 PM p.s: has anyone checked the logs...?
thanks! Title: Re: Bad TRIMS after Wideband CONVERSION...please help! Post by: vagenwerk on August 05, 2013, 03:25:33 PM yes i do.
check fuel pressure, you could also do test - unplug vacum from fpr - fuel pressure regulator on idle, injection time should decrease and short term fuel trim should go to minus , if not , probably fuel pump is dead, but check fuel pressure during ride you should read 3bar+ boost = 3.7bar fuel pressure on the rail should be during wot on 3 gear , and about 3.6bar@6000rpm |