Lean but injector duty cycle remains low

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Topic: Lean but injector duty cycle remains low (Read 4444 times)

vtraudt

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	Lean but injector duty cycle remains low « on: March 22, 2018, 06:44:21 AM »

Actual AFR going lean with higher rpm while desired AFR is slowly decreasing.
Yet injector duty cycle remains low at 30% and not going up.
See attached log.

Why is ECU not increasing duty cycle to bring actual and desired AFR in line?

B6 1.8T 550cc Bosch EV14, S4 MAF. 518AF ECU.


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2002 Allroad 2.7T 6spd stage 2
1998 A4 1.8T 5spd stage 3
1996 A4 2.8 auto stock

jimmcgee5

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	Re: Lean but injector duty cycle remains low « Reply #1 on: March 22, 2018, 08:04:25 AM »

blocked fuel filter or pump on its last legs .


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vtraudt

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	Re: Lean but injector duty cycle remains low « Reply #2 on: March 22, 2018, 08:39:28 AM »

Quote from: jimmcgee5 on March 22, 2018, 08:04:25 AM

blocked fuel filter or pump on its last legs .

If not enough fuel gets to the engine, why is ECU not 'trying' to compensate by cranking up the injector duty cycle?


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2002 Allroad 2.7T 6spd stage 2
1998 A4 1.8T 5spd stage 3
1996 A4 2.8 auto stock

neuro

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	Re: Lean but injector duty cycle remains low « Reply #3 on: March 22, 2018, 11:41:14 AM »

Maybe you reach the 25% fuel adaptation limitation

search for min 0.75 max 1.25 value.. i don't remember the exact map name of those in def file. but that won't fix your problem.


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seany260

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	Re: Lean but injector duty cycle remains low « Reply #4 on: March 22, 2018, 03:01:36 PM »

Whats the ECU and is KRKTE correct?


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corradovolksb

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	Re: Lean but injector duty cycle remains low « Reply #5 on: March 22, 2018, 07:59:21 PM »

I agree with jimmcgee5 either a clogged fuel filter or pump issue.

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2000 Nogaro blue S4 Stage 2. VAG for life.

vdubnation

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	Re: Lean but injector duty cycle remains low « Reply #6 on: March 23, 2018, 08:11:07 PM »

problems of a returnless fuel system


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vwaudiguy

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	Re: Lean but injector duty cycle remains low « Reply #7 on: March 23, 2018, 09:02:15 PM »

This ecu has a wideband, and should be correcting at wot though?


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"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."

jimmcgee5

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	Re: Lean but injector duty cycle remains low « Reply #8 on: March 24, 2018, 04:06:13 AM »

we need to see logs .


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