Hesitation

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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mavada
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Re: Hesitation

Post by mavada » Wed Sep 24, 2014 9:24 pm

Shoppinit wrote:I don't believe the pump can generate any codes. The fuel pump controller module might though. Possibly you need to do some logs while driving to see what's happening to the mixture when the hesitation occurs.
Back on topic after a while.
What numbers do i have to log to see whats happening?
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Re: Hesitation

Post by Shoppinit » Wed Sep 24, 2014 9:32 pm

See what the lambda correction is doing when you are demanding lots of power (but not WOT - you need to be in closed loop mode).

If the mixture starts leaning out when you have a high demand for fuel, that would point to fuel pump problems.

It might be a MAF issue. It's been a while since I looked at this thread and I'm too lazy to go back and look at the original symptoms...
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Re: Hesitation

Post by mavada » Thu Sep 25, 2014 2:27 pm

Got a code yesterday:

01177 - Engine Control Unit
49-00 - No Communications

Possibly got the code after the lack of fuel/mixture...
If you can't go to the track, bring the track to you.
Mugello Blue C5 RS6 Avant
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MTM Bimoto wheels 9,5 x 19 ET 30 LK 5x112 with 275/30/19 tyres
MTM exhaust system cat back 4-pipe with throttle valves in 2 pipes, control
Yellow Koni's
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Shoppinit
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Re: Hesitation

Post by Shoppinit » Thu Sep 25, 2014 2:35 pm

What module was that code in?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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Re: Hesitation

Post by mavada » Thu Sep 25, 2014 2:36 pm

Sorry, forgot the upper part of it...

Address 17: Instruments Labels: 4B0-920-xxx-17.lbl
Control Module Part Number: 4B0 920 937 B
Component and/or Version: KOMBI+WEGFAHRS. VDO D11
Software Coding: 01084
Work Shop Code: WSC 00215

1 Fault Found:

01177 - Engine Control Unit
49-00 - No Communications
If you can't go to the track, bring the track to you.
Mugello Blue C5 RS6 Avant
Viper Tuning ECU/TCU
MTM Bimoto wheels 9,5 x 19 ET 30 LK 5x112 with 275/30/19 tyres
MTM exhaust system cat back 4-pipe with throttle valves in 2 pipes, control
Yellow Koni's
Porsche 959, gone but not forgotten.
Fight ALS disease https://www.youtube.com/watch?v=wGFDWTC8B8g
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Shoppinit
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Re: Hesitation

Post by Shoppinit » Thu Sep 25, 2014 4:31 pm

It's probably nothing then. You get the occasional brain fart like this. Mine does it too every now and then. Clear it and see if it comes back.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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Re: Hesitation

Post by mavada » Thu Sep 25, 2014 6:51 pm

Strange thing is it (the hesitation from +/_3000rpm) never happens with cold engine.
If you can't go to the track, bring the track to you.
Mugello Blue C5 RS6 Avant
Viper Tuning ECU/TCU
MTM Bimoto wheels 9,5 x 19 ET 30 LK 5x112 with 275/30/19 tyres
MTM exhaust system cat back 4-pipe with throttle valves in 2 pipes, control
Yellow Koni's
Porsche 959, gone but not forgotten.
Fight ALS disease https://www.youtube.com/watch?v=wGFDWTC8B8g
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Re: Hesitation

Post by mavada » Tue Oct 14, 2014 5:46 pm

Have to find out which pump it is, think the outside pump can get the inside pump whine when outside pump isnt working enough...?
Will have to find out which section to log, never logged before....
If you can't go to the track, bring the track to you.
Mugello Blue C5 RS6 Avant
Viper Tuning ECU/TCU
MTM Bimoto wheels 9,5 x 19 ET 30 LK 5x112 with 275/30/19 tyres
MTM exhaust system cat back 4-pipe with throttle valves in 2 pipes, control
Yellow Koni's
Porsche 959, gone but not forgotten.
Fight ALS disease https://www.youtube.com/watch?v=wGFDWTC8B8g
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subtacex
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Re: Hesitation

Post by subtacex » Wed Oct 15, 2014 6:04 pm

Just had the same problem only worse(check my threads)
If you can hear the high pressure pump run up when ignition is on,car runs fine when not up to temperature and hesitates when at temperature...your in tank lift pump is breaking down...change it
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