17536: Fuel Trim: Bank 1 (Mult): System too Lean

Martyn · Dec 30, 2005

Guys,

As of yesterday I've managed to pick up the above fault code. If I clear the code the car runs fine for a few miles before popping back up and running in limp mode.

After much searching and reading I've tracked it down to 3 possible issues...MAF, Lambda probes or Boost/VAC leak.

So today I spent most of the day replacing boost/vac pipes, some of which were completely shot.

Whilst I was there I also removed the MAF and an N75 and cleaned them thoroughly with IPA/Isoprop.

Whilst I was there I also disconnected the battery.

I refitted the MAF, N75, double checked all the hoses, reconnected the battery and performed a TBA before taking the car out for a spin.

A few miles later the car is back in limp mode with the same fault logged.

Some further reading lead me to check block 031 and 032 with VAG-COM (http://www.uk-mkivs.net/forums/391473/ShowPost.aspx)

Here are my findings....

http://www.seatcupra.net/IbizaR/LOG-002-031-032.xls

Car is fine until lambda 2 hits +10.

Next log is after the code is cleared...

http://www.seatcupra.net/IbizaR/LOG-002-031-032_Run2.xls

Max MAF reading is/was 149.97 g/s, limp mode soon followed along with the fault code....

Control Module Part Number: 6K0 906 032 AB
Component and/or Version: 1.8L20VTCUPRA R 0001
Software Coding: 11500
Work Shop Code: WSC 78133
1 Faults Found:
17536 - Fuel Trim: Bank 1 (Mult): System too Lean
P1128 - 35-00 - -

As as an aside I decided to clear the fault again and unplug the MAF, took the car for a quick spin and it went like stink with every run. No errors were logged apart from the MAF signal too low (obviously).

Car spec is as listed in my signature....

Any ideas guys?

Cheers,

Marts

Jay · Dec 31, 2005

i was going to say that 149g/s @ 5040 rpm was not so bad (i think it could be 10g/s higher) but the 17.22ms injection time was really low, and then i realized you have stage 2 so remap targeted to a 4b fpr and lower injection time :redface:

sorry if i say something stupid but :

- a problem with the FPR ? injection ?

- a messed o² sensor that report wrong values ?

Martyn · Dec 31, 2005

I don't as yet have a 4 bar FPR buddy

I need to get under the car and check that the small hose that comes off the turbo inlet pipe hasnt popped off. I hope its not the o2 sensor as they're not cheap

stoneyfordNI · Dec 31, 2005

could be problem , if its running the boost for stage 2 but not the fuel, surely itll run lean, thought 4bar FPR was a requirement for stage 2

Martyn · Dec 31, 2005

Depends who you speak to mate. The FPR has crossed my mind a couple of times though....

Jay · Dec 31, 2005

Martyn said:
I don't as yet have a 4 bar FPR buddy

i think you have found your problem

the stage 2 remap is targeted to the 4b fpr and so injection times are lower, keeping the 3b fpr and you run lean.

i would say you shouldn't use the car until fitting a 4b fpr

Jay · Dec 31, 2005

Martyn said:
Depends who you speak to mate. The FPR has crossed my mind a couple of times though....

every mk3 ibiza stage 2 log i've seen show lower injection time so i would say the 4b fpr is also required for the ibiza :thumbup:

stoneyfordNI · Dec 31, 2005

yep things tend to melt when u run lean , think pistons (u have 4 ) think valves ( u have 20)

Martyn · Dec 31, 2005

Arse

Best pop to Audi tomorrow morning then!

Thanks for the help guys, I shall keep you posted.

m0rk · Dec 31, 2005

without the constant ECU adaptations & Reset you get normal injection times with a 3bar..... it just adapts to suit. (I borrowed a 4bar to prove my theory)

Jay · Dec 31, 2005

m0rk said:
without the constant ECU adaptations & Reset you get normal injection times with a 3bar..... it just adapts to suit. (I borrowed a 4bar to prove my theory)

i'm not sure to correctly understand what you write (not awaked enough to be sure to translate well :redface:

), but you mean you use a 3b fpr with stage 2 and all is ok with ecu adapting and using higher injection time ?

Martyn's log is quickly showing more than 10% for multiplicative trim and a max of 25% (which may be the max it can report seeing how it hit a wall on this perfect round up value), i don't think adaptation can deal with that kind of difference

i remember i have seen in one of your log that the maf values was low (with correct boost) it may explain that ecu managed to adapt without throwing a fault, do you have a log of block 32 to see your trim values ?

i'm sorry if i misunderstand :worship:

Martyn · Dec 31, 2005

Right guys, 4 bar FPR is now fitted, check the log below...

http://www.seatcupra.net/IbizaR/LOG-002-031-032_4bar.xls

No fault code so far but I'd of thought Lambda 2 would of been a smidge lower?

Do I need to reset the ECU after fitting the FPR or will a bit more driving do the trick?

ibizacupra · Dec 31, 2005

I did'nt know you were running stage 2 without 4bar fpr... :doh:

Did'nt anyone say you should m8?

Martyn · Dec 31, 2005

It was a bit of a grey area Bill.

Martyn · Dec 31, 2005

Code is back, was fine until the lambda 2 % started creaping up. Log of 'ok' running and now 'limp' can be found below.

http://www.seatcupra.net/IbizaR/LOG-002-031-032_4bar2.xls

Car

Martyn · Dec 31, 2005

Come on guys, need to get this sorted before I melt something

PhilW · Dec 31, 2005

Not much help here, but did you get that stalling problem sorted? Linked maybe?

Martyn · Dec 31, 2005

Phil, it hasnt done it for a little while mate, I think it could of been down to a split vac hose but once I've got this problem sorted i'll try and see if I can get it to do the stalling thing for ya mate

vern · Dec 31, 2005

Hi martyn,

Just confirm to me you are running stage 2 for sure, as how come who ever loaded it did not fit the 4 bar fpr?

only revo will know or maybe bill, but revo stage 2 ignores 2nd 02 sensor is this for fault code? or does it make the numbers mean nothing? as you start @ stioch then go mega lean!!!! also this is closed loop, so i think above 2500 revs WOT 02 sensor does jack for fueling, left to maf etc, i would swap your maf with someone else's mate, known good one............

vern · Dec 31, 2005

Martyn noticed you have a multi code not addi code, that means your running lean all throughout rev range!!!!!! i calc on your 149g/s reading you are doing 185 bhp ish well down for an R i am 98% certain your Maf is feked mate

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