[JayRS3]

Im going to keep this quite short as I need as much input as possible and don’t want to lose the attention of individuals with a long description. As I’m quite open to ideas now as I’ve run out of ideas.

February 2018 G247 fuel sensor fault.


So far replaced:-
High fuel pressure sensor (G247)
Low fuel pressure sensor (G410)
Low pressure fuel pump
High pressure fuel pump
Fuel filter
Injectors
Diverter valve
Battery
Spark plugs
Ignition coils

Since replacing the G247 fuel sensor I have had this reoccur about 5 other times since. When the fault latches all boost is lost until the ignition is cycled again and/or reset via VCDS.

Symptoms
Low rpm stuttering around 1200-1800rpm and of course loss of boost when the fault latches.
If ‘do not exceed 4000rpm’ occurs that’s normally a sign of the G247 sensor too.

I’ve spoken to Audi who said that when ‘G247’ is put into ETKA the only other sensors that are associated to it are the MAP sensors (which we have 2) however I know these are okay and within spec.


Anyone else had this?
I’ve spoken to people in Romania and Sweden who have said that in some countries there was a software recall for this sensor so maybe I’ve bought a duff sensor (from TPS). But then I know Dell has replaced the sensor with no issues since.

Driving me mad is an understatement.

Edited by JayRS3, 20 April 2018 - 08:38 PM.

[Paul]

I’d probably try another sensor.


This is not meant to sound like scare mongering or come across as negative, I’ve had remapped cars in the past, but could it be related to a remap? i.e the momentary demand / request/ delivery of x amount of fuel at y, causing fault z?

(I’m guessing here) the pressure sensor is probably just giving a voltage back to the Ecu, and it’s the Ecu that has to translate that data into usable information, forward it on, do its calculations and decide what’s in spec.

So check wiring harness / plug for damage.

I haven’t logged with vcds for years, and even then, it takes someone with knowhow to translate the data, but is it possible to log the fuel pressure?

You probably wouldn’t catch the fault, unless you know what conditions can create it, but it might give an understanding of the pressures?



I’m sure you have seen this and it’s suggestions

http://wiki.ross-tec...hp/P119A/004506

[Paul]

http://forums.ross-t...-the-fault-code

Can be handy to drill down into the fault message.

Note the 001 - upper limit exceeded ... clue ?

[JayRS3]

I have logged data for the past 2 weeks to try and catch the fault but it seems as though since the change of weather I can’t re create the fault (so temperature related could also throw a spanner in the works). I can feel the stutter but it’s not enough to throw the fault in now - which of course isn’t ideal.

I’m pretty adamant it’s not tune related as I went last year from March to December with no issues at all. I’ve been up to MRC recently for this issue and he’s monitored all values whilst I was driving and said there was no discrepancies but of course I couldn’t get the fault to latch. Again I could feel the stutter / he couldn’t. So I sounded like a mad man.

During the cold spell in January I had random misfire issues but that was just plug selection. Cold engine - cold plug - doesn’t work!

Then now this G247... the only possibility is a wiring issue but surely it would occur daily if that was the case also when replacing the sensor it’s only a case of pulling the plug off and no other cabling is disturbed so I’m finding it hard to think it’s that.

My thoughts exactly on the sensor regarding voltage etc which is what the Audi recall/software update was all about but again it’s strange how that only applied to some countries and not others.

Interesting about the breakdown of the actual fault and what all the binary means.

I did start with the rosstech fault diagnosis to get the ball rollin and unfortunately apart from wiring I’ve changed everything else

Edited by JayRS3, 21 April 2018 - 06:28 AM.

[MarkMac-RS3]

Im going to keep this quite short as I need as much input as possible and don’t want to lose the attention of individuals with a long description. As I’m quite open to ideas now as I’ve run out of ideas.

February 2018 G247 fuel sensor fault.


So far replaced:-
High fuel pressure sensor (G247)
Low fuel pressure sensor (G410)
Low pressure fuel pump
High pressure fuel pump
Fuel filter
Injectors
Diverter valve
Battery
Spark plugs
Ignition coils

Since replacing the G247 fuel sensor I have had this reoccur about 5 other times since. When the fault latches all boost is lost until the ignition is cycled again and/or reset via VCDS.

Symptoms
Low rpm stuttering around 1200-1800rpm and of course loss of boost when the fault latches.
If ‘do not exceed 4000rpm’ occurs that’s normally a sign of the G247 sensor too.

I’ve spoken to Audi who said that when ‘G247’ is put into ETKA the only other sensors that are associated to it are the MAP sensors (which we have 2) however I know these are okay and within spec.


Anyone else had this?
I’ve spoken to people in Romania and Sweden who have said that in some countries there was a software recall for this sensor so maybe I’ve bought a duff sensor (from TPS). But then I know Dell has replaced the sensor with no issues since.

Driving me mad is an understatement.

Jay I’ve sent you a PM for some info about where you sourced your LPFP, I think mine is in its way out.

Edited by MarkMac-RS3, 21 April 2018 - 07:56 AM.

[T-800]

When I just searched Etka for G247

It threw up 3 illustrations
Pressure sensor attached to intake


Low pressure sensor you already replaced


Pressure sensor on the elbow




None of makes sense because Elsa always referred to G247 as high pressure sensor.

 

 

There is a Control unit attached to the lift pump in the tank, whether its related to the issue is any ones guess..........

 

On the 8V it is known to play up

 

 

Edited by T-800, 21 April 2018 - 08:49 AM.

[JayRS3]

When I just searched Etka for G247

It threw up 3 illustrations
Pressure sensor attached to intake


Low pressure sensor you already replaced


Pressure sensor on the elbow




None of makes sense because Elsa always referred to G247 as high pressure sensor.


There is a Control unit attached to the lift pump in the tank, whether its related to the issue is any ones guess..........

On the 8V it is known to play up

Yeah there the only sensors I haven’t replaced, they are the MAP sensors aren’t they? They seem to be within spec. And the LP sensor I have replaced.

The G247 is a high pressure sensor and should be just that sensor on the fuel rail.

Some people when they replace the lpfp do change the controller but I was told it’s not needed. When I’ve monitored the lpfp fuel I’m getting good pressure of lpfp up to the hpfp. But of course if I can create the fault (which I cants seem to do now) I would hopefully be able to see a drop/ restriction from one of the fuel systems

Edited by JayRS3, 21 April 2018 - 09:22 AM.

[JayRS3]

Yeah there the only sensors I haven’t replaced, they are the MAP sensors aren’t they? They seem to be within spec. And the LP sensor I have replaced.

The G247 is a high pressure sensor and should be just that sensor on the fuel rail.

Some people when they replace the lpfp do change the controller but I was told it’s not needed. When I’ve monitored the lpfp fuel I’m getting good pressure of lpfp up to the hpfp. But of course if I can create the fault (which I cants seem to do now) I would hopefully be able to see a drop/ restriction from one of the fuel systems

^^^ edited few auto corrects

[JayRS3]

Jay I’ve sent you a PM for some info about where you sourced your LPFP, I think mine is in its way out.

i’ve replied mate. What makes you think yours is on its way out? Have you got VCDS? If so, check group 103 for fuel delivery pressure at idle/ running.

[MarkMac-RS3]

i’ve replied mate. What makes you think yours is on its way out? Have you got VCDS? If so, check group 103 for fuel delivery pressure at idle/ running.

It seems to me as if it’s overly noisy to be honest. Making the same tempo ticking as the one I’ve been trying to trace. Thanks for the reply as well mate 👍🏻 Sorry for hijacking your thread by the way!

Edited by MarkMac-RS3, 21 April 2018 - 09:39 AM.

[JayRS3]

I’ve just stuck the OEM spark plugs in and gone for a poodle around the village (from a cold start & even at running temp) and the stuttering is still occurring at around 1400-1800rpm which is reassuring as I knew it wasn’t plugs as I was running NGK racing plugs -9 last year with no issues.

I’m now running -8 racing plugs so not as cold plug but obviously still having the issue.

I’m really struggling which angle to take next.

What was the issue with 8V controller again? It’s under the passenger seat though isn’t it on the 8V whereas on the 8P it’s by the LPFP.

[T-800]

I’ve just stuck the OEM spark plugs in and gone for a poodle around the village (from a cold start & even at running temp) and the stuttering is still occurring at around 1400-1800rpm which is reassuring as I knew it wasn’t plugs as I was running NGK racing plugs -9 last year with no issues.

I’m now running -8 racing plugs so not as cold plug but obviously still having the issue.

I’m really struggling which angle to take next.

What was the issue with 8V controller again? It’s under the passenger seat though isn’t it on the 8V whereas on the 8P it’s by the LPFP.

8V module was a cutting out affair so not like your symptoms Jay.

On the 8P it looks like it's on top to the rear of the tank

Edited by T-800, 21 April 2018 - 12:22 PM.

[JayRS3]

8V module was a cutting out affair so not like your symptoms Jay.

On the 8P it looks like it's on top to the rear of the tank

yeah I remember seeing it. This is a complete head f**k and there is very little information online about it. I know a few heavily modified cars which have the same issue but they just live with it. I can’t do that, but it’s proving to be a very costly exercise. Me and a guy in Romania are in talks daily about it to see if we can resolve it, he’s got a TTRS.

I’m going to disconnect the G247 harness in a bit and reconnect to make sure it’s seated properly, I know it is but desperate measures.

I may replace the MAP sensors next.
May try another G247 sensor.
Wonder if there’s a malfunction within the crankcase cover (PCV).

Edited by JayRS3, 21 April 2018 - 12:27 PM.

[T-800]

yeah I remember seeing it. This is a complete head f**k and there is very little information online about it. I know a few heavily modified cars which have the same issue but they just live with it. I can’t do that, but it’s proving to be a very costly exercise. Me and a guy in Romania are in talks daily about it to see if we can resolve it, he’s got a TTRS.

I’m going to disconnect the G247 harness in a bit and reconnect to make sure it’s seated properly, I know it is but desperate measures.

I may replace the MAP sensors next.
May try another G247 sensor.
Wonder if there’s a malfunction within the crankcase cover (PCV).

I'd imagine an issue with PCV would make it tick over rough too Jay...........is it ticking over smooth ?

[T-800]

Also Jay.......

 

If you unplug the sensors one by one and it goes into limp home / EML does it run any different ?

[JayRS3]

I'd imagine an issue with PCV would make it tick over rough too Jay...........is it ticking over smooth ?

yes it idles fine. I know I have vacuum too as when the dipstick or oil cap is removed you can feel the suction on the oil cap along with engine tick over noise changing.

[JayRS3]

Also Jay.......

If you unplug the sensors one by one and it goes into limp home / EML does it run any different ?

I said to this Romania guy about perhaps disconnecting the G247 to create the fault to latch and then reconnect and log the data to find out what components aren’t performing to spec however he said the moment it’s disconnected it will run rich like a pig, foul the plugs and run rough. He had the same when he was building his engine and didn’t seat the harness properly.

[T-800]

I said to this Romania guy about perhaps disconnecting the G247 to create the fault to latch and then reconnect and log the data to find out what components aren’t performing to spec however he said the moment it’s disconnected it will run rich like a pig, foul the plugs and run rough. He had the same when he was building his engine and didn’t seat the harness properly.

Have you checked the G247 sensor and its pins are seated correctly ? 

Just a thought with it being an absolute pig to get too tucked under the inlet chamber......

[JayRS3]

Have you checked the G247 sensor and its pins are seated correctly ?
Just a thought with it being an absolute pig to get too tucked under the inlet chamber......

I’m going to disconnected it and re connect in a bit just waiting for the engine to cool down. Not looking forward to having cut hands again, so awkward

Pretty adamant it was done properly first time but worth a go.

Edited by JayRS3, 21 April 2018 - 12:39 PM.

[T-800]

I’m going to disconnected it and re connect in a bit just waiting for the engine to cool down. Not looking forward to having cut hands again, so awkward

Yeah I know what you mean on that one.

You gotta watch out any excess fuel doesn’t make its way into the sensor plug as it can ruin the rubber seal