2006 A6 B6 3.2 runs for about 11 minutes after first start then suddenly stalls. No Codes detected, No Engine Light.

   #21  

acostae

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Well, this sounds good. Appreciate knowledgeable advice, thank you. Not good time for off wall or guess stabs.

Will do removal of Upstream O2 sensors in the morning, then run it to see results.

Do we have instructions in Ross-Tech on Fuel Delivery Test? I have not officially performed one.

Too many numbers to keep track off, sorry not 30 anymore.

Looking for Cats temperature readings to give you a more plausible number.
You are correct, 479C not F!
Both were around 530C when running, then little while later when it shut down 479C.

Verified fuel filter is properly oriented.

Here's one of the readings from couple days ago. Right after it shut off- 23: Fuel Rail Pressure 1300 kPa rel (Relative?)

23: Fuel Rail Pressure at 864 RPM was 3510 kPa rel, before it shutdown.
11: Absolute Throttle Positions were 13.7% and 13.3%, before it shutdown.
0B: Intake manifold Absolute Pressure was 40 kPa abs, before it shutdown.

Code:
Wednesday,10,January,2024,16:01:57:35625
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 23.11.0.0 (x64)  HEX-V2 CB: 0.4643.4
Data version: 20231027 DS351.0
www.Ross-Tech.com


VIN: WAUDH74F76N150374   License Plate: HGL0100
Mileage:    Repair Order: 20240110



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Wednesday,10,January,2024,16:01:57
VCDS Release 23.11.0 (x64):  Generic OBD2
Mode 1:Read Data

0B:Intake Manifold Absolute Pressure     97 kPa abs
0C:Engine RPM     0 /min  0 /min
11:Absolute Throttle Position     15.7 %  15.7 %
23:Fuel Rail Press (rel)     1300 kPa rel

These were read right after shutdown.

Thanks again for your advice and time EuroX.
 
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EuroX

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3500kpa are we sure this is accurate? 3500kpa is 0.036bar. Which is well nothing in terms of pressure. Can you verify pressure readings? By checking low side pressure switch and high pressure switch mvb? Was this with front 02 sensors removed?

Fuel delivery test normally you put a fuel pressure gauge inline before the rail or hpfp. with ball valve or restrictor. Run the pump and close the valve till the gauge reads 4bar. Then empty container and run the pump for 15 seconds. Should see 500-800ml. Also what is the source/vendor of fuel filter?
 
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3500 kpa is 35 bar
 
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EuroX

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3500 kpa is 35 bar
Yes your right sorry the online calculator was wrong or I entered the data wrong. Still 35bar seems low to me. I think it should be closer to 50bar while idling.
 
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acostae

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Alrighty, filter from Oreilly Auto Parts, brand was Standard, Part# PR440, replaced 05/23/2023.
Car ran for 6 months before this stall condition appeared.
Looking for a saved log with Fuel pressure numbers.
Thanks both.

Also, found a Fuel Rail Pressure sensor at OReilly's, Bosch brand, grabbing it today.
Still going to do the Cat test to rule em out.

Remove both Upstream O2 Sensors then run until it stalls?
On average it takes 30 minutes at Idle to Shutdown
 
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acostae

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Here's a Readiness Test result:

Note the Catalyst Monitoring, Evaporative System Monitoring and Oxygen Sensor Monitoring results.
Also, Fuel System Passed, will do a test anyway.

Code:
Sunday,21,January,2024,13:23:15:35625
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 23.11.0.0 (x64)  HEX-V2 CB: 0.4643.4
Data version: 20231027 DS351.0
www.Ross-Tech.com


VIN: WAUDH74F76N150374   License Plate: HGL0100
Mileage: 324880km-201871mi   Repair Order: 202401211322_RDYTEST


Mode 01 - PID 01 : Readiness  --  Address 7E8

Number of DTCs stored: 0  --  MIL Status: MIL OFF
Misfire monitoring:  Passed
Fuel System:  Passed
Comprehensive Components:  Passed
Catalyst monitoring:  Failed or Incomplete
Heated catalyst monitoring: Not installed.
Evaporative system monitoring:  Failed or Incomplete
Secondary air system monitoring: Not installed.
A/C system refrigerant monitoring: Not installed.
Oxygen sensor monitoring:  Failed or Incomplete
Oxygen sensor heater monitoring:  Failed or Incomplete
Exhaust Gas Recirculation: Not installed.

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Mode 01 - PID 01 : Readiness  --  Address 7E8

Number of DTCs stored: 0  --  MIL Status: MIL OFF
Misfire monitoring:  Passed
Fuel System:  Passed
Comprehensive Components:  Passed
Catalyst monitoring:  Failed or Incomplete
Heated catalyst monitoring: Not installed.
Evaporative system monitoring:  Failed or Incomplete
Secondary air system monitoring: Not installed.
A/C system refrigerant monitoring: Not installed.
Oxygen sensor monitoring:  Failed or Incomplete
Oxygen sensor heater monitoring:  Failed or Incomplete
Exhaust Gas Recirculation: Not installed.
 
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acostae

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Well, looks like I'm not paying attention to what I'm seeing, Here's more Failed tests:

Saturday,13,January,2024,11:39:29:35625
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 23.11.0.0 (x64) HEX-V2 CB: 0.4643.4
Data version: 20231027 DS351.0
www.Ross-Tech.com


VIN: WAUDH74F76N150374 License Plate: HGL0100
Mileage: 324880km-201871mi Repair Order: 20240113_RDYSTATUS


Readiness Status: 0110 0101
Exhaust Gas Recirculation: Passed
Oxygen Sensor Heating: Failed or Incomplete
Oxygen Sensor(s): Failed or Incomplete

Air Conditioning: Passed
Secondary Air Injection: Passed
Evaporative Emissions: Failed or Incomplete
Catalyst Heating: Passed
Catalytic Converter(s): Failed or Incomplete
 
   #28  

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No way on a fuel filter from O'Reilly's Auto Parts.
Dealer only for that part.
Does it have built in pressure regulator in filter?

Fuel Rail Pressure sensor at O'Reilly's also.
Again not good.

Good Luck
 
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   #29  

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If it has an electrical connector on it, I suggest to get it from the dealer. O'Reilly's may sell a good windshield washer fluid, but I would not be putting various engine components from them in any of my cars.

As far as fuel rail pressure goes, take a look at 01-08-140 and that will show spec and actual rail pressures.... don't expect a perfect match, expect them to be close.... I'd want the original OE fuel rail pressure sensor in there, not a generic "Bosch". Uwe use to pay us a bonus for everything time some one said "it came in a Bosch box".... yearly budget blown in 45 days and that was the end of that.
 
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Thanks Jef, called the dealer parts department in Grapevine, he's getting the fuel filter and OE Fuel Rail Pressure sensor for me.

Had to take advantage of my employee discount at O'Reilly's, been part timing there since 1998.
I do believe you guys about using name brand on certain vehicles.
When I had my MB S430 and then my MB S550, I learned my lesson as I am now with my A6.
Thought being older would not make much of a difference, looks like I am wrong.

Removed both Upstream O2 Sensors then ran until it stalled, revved a few times and throttle response was crisp, then it took about 20 minutes to Shutdown.
Was alone so couldn't feel the exhaust pipes for good or bad flow out.
However, each exhaust pipe had a blackish puddle under them.

Assembled it, then friend came over to assist.

Connected to VCDS and Read Fuel Rail Pressure while running it, we saw 3510 kPa again, revved it to 2K RPM and went down to around 2000 kPa.
Released throttle pedal and went up to 3510 for few minutes then we saw it drop all the way down to 260 kPa and stall.
Also, we felt very little flow out of the pipes at Idle and higher RPM.

Calling dealer for price on Low Pressure Fuel Pump and doing a warranty return on the O'Reilly one.

Hoping to have the following Audi brand components installed soon:
Low Pressure Fuel Pump
Fuel Filter/Regulator
Fuel Rail Pressure Sensor

Will do the 01-08-140 Measure before and after getting Audi Fuel Rail Pressure sensor.

Looking to replace the cats also so, shopping around for options.

Converter & Pipe from Audi look like $2,252 each if available, will call to verify.

Thanks again for the time and suggestions Jef.
 
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Looking to replace the cats also so, shopping around for options.
:confused: Am I missing something that implies you have bad cats?
 
   #32  

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Was a fuel delivery test done on this vehicle? There was another member on here that made a mistake with a fuel filter as well. He purchased a Hengst brand fuel filter which one would think would be good as its a reputable name yet in the end the issue was the filter. Fuel delivery test pointed towards the filter. When would run great at idle but off idle it had really bad fuel trim values.


I will reach out to a buddy of mine, IIRC he replaced a ecm recently on a similar vehicle. I had to program the new ecm for him. I will ask what symptoms he had. I could see a ECM being and issue if a driver on the pcb is getting hot doing weird things. I will let you know tomorrow.

I only mentioned this as your title states no MIL. Does this mean when engine stalls no MIL is present? If so could be related to ECM.
 
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Trying to systematically diagnose my engine stall issue, maybe better to call in and start a trouble ticket rather than trying different approaches to figure out my symptoms.
 
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Fuel delivery test done?
 
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Not yet, need to figure out how to properly do it. Looking in VCDS for guidance or instructions.

Fuel delivery test normally you put a fuel pressure gauge inline before the rail or hpfp. with ball valve or restrictor. Run the pump and close the valve till the gauge reads 4bar. Then empty container and run the pump for 15 seconds. Should see 500-800ml. Also what is the source/vendor of fuel filter?

Also looking for best place to install the fuel pressure gauge.
Trying to see if my fuel pressure gauge has provisions to add a container
 
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   #36  

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Install gauge at end of supply line before the rail or line for hpfp,with ball valve or restrictor. Run the pump and start to close the valve till the gauge reads 4bar.line pressure. Then empty container and run the pump for 15 seconds. Should see 500-800ml.
 
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All righty, the bigger one of the two metal lines at the HPFP, right?
 
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Supply line going to the fuel tank. Maybe rubber line because it low pressure.
Steel one's are high pressure from pump to injectors. Danger Will Robison danger.

Good Luck
 
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I would do rubber supply line before hpfp.
 
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