Fuel trims goes wild, cure?

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professor

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	Fuel trims goes wild, cure? « on: November 11, 2012, 02:10:39 PM »

The patient: 1.8T 20V forged with gt3071 turbocharger and 630 dekas.

Fuels trims around -1% both on idle and stfts (values which were checked after 100km).

Problem is present after 4 - 5 hard wots till top gear readline. Stfts going crazy rich to -14% and perhaps more if not resetting these.

N249, SAI were physically removed. Eskonf adjusted properly and for N249 those maps were adjusted as:
CWBGMSZS -> 0
DLDUVES -> FF
CWDLDUV -> 0
TMMZUV -> FF
TMFDUV -> FF
TMDLDUV -> FF
CDTLDUV -> stock

Forgot to mention that car was throwing P1200 for N249 mechanical malfunction before removing the DTC.

Give me your suggestions to treat the man to go home

thanks


« Last Edit: November 11, 2012, 02:49:38 PM by professor »	Logged

Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©

elRey

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	Re: Fuel trims goes wild, cure? « Reply #1 on: November 11, 2012, 02:15:03 PM »

remove manifold pressure signal to FPR and report.

Maybe TVUB to high but KRTE too low ?


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professor

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	Re: Fuel trims goes wild, cure? « Reply #2 on: November 11, 2012, 02:19:13 PM »

Quote from: elRey on November 11, 2012, 02:15:03 PM

remove manifold pressure signal to FPR and report.

Maybe TVUB to high but KRTE too low ?

Havent heard that before. Is it safe doing that? Dont wanna face some distance surprises!!

No KRKTE and TVUB are spot on since working great on my car with same injectors and fpr.


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Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©

s-company

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	Re: Fuel trims goes wild, cure? « Reply #3 on: November 11, 2012, 03:34:12 PM »

hfm is stock?
did you modify the intake hose to the turbo?


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professor

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	Re: Fuel trims goes wild, cure? « Reply #4 on: November 12, 2012, 01:29:31 AM »

Quote from: s-company on November 11, 2012, 03:34:12 PM

hfm is stock?
did you modify the intake hose to the turbo?

hfm is from audi s3 and khfm is stock from s3 too.
Yes intake is modified and airbox is no longer used.


« Last Edit: November 12, 2012, 01:56:47 AM by professor »	Logged

Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©

sn00k

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	Re: Fuel trims goes wild, cure? « Reply #5 on: November 12, 2012, 02:57:20 AM »

if no longer using the airbox, try zeroing KFKHFM (correction for intake snorkel etc), and see if it still does that..
might require some trimming, but id definitely start from zero and not from the oem intake-tract map.


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professor

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	Re: Fuel trims goes wild, cure? « Reply #6 on: November 12, 2012, 10:19:26 AM »

Think i found the problem.
I ll report back when triple checked that it solves the problem.


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Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©

kenmac

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	Re: Fuel trims goes wild, cure? « Reply #7 on: November 24, 2012, 08:33:59 AM »

And what did you find, sir?


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professor

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	Re: Fuel trims goes wild, cure? « Reply #8 on: November 24, 2012, 08:57:43 AM »

Haven't forgot it. Owner got a boy and has no time to make some kilometers.
I ll update when i am sure with the answer. 99% its HW related.


« Last Edit: November 26, 2012, 02:18:48 PM by professor »	Logged

jibberjive

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	Re: Fuel trims goes wild, cure? « Reply #9 on: November 26, 2012, 03:46:16 AM »

"Fuel trims gone wild, cure?"

The cure is to not let them go to Mexico on spring break.


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professor

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	Re: Fuel trims goes wild, cure? « Reply #10 on: December 07, 2012, 05:27:58 AM »

So problem was a broken T vacuum solenoid adaptor within manifold and FPR used for boost gauge measurements.
Replaced and problem is not present any more.


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