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Thats pretty messed up. To be honest, faults like that could easily be mistaken for the ecu losing the plot :) by the way, the Weitec coilovers on the A4 are still as smooth and doing a good job as the day I got them from you :)Quote:
Originally Posted by Crasher
PS - Do you remember 'roughly' how much the lift pumps are and are they only available through Audi etc ?
ok, a little update, the rain is pishing out of the heavens today so I have not checked any of the mechanical stuff but did find a few interesting readings on the computer. I had previously erased the fault yesterday and had an 80 mile round trip to make today so before I set off, I rechecked for faults... NO FAULTS FOUND ( as expected ) and I checked the MVB 103 and 106 with the engine at idle and this is where I think I might have found some strange readings. I have attached a picture from my phone to show yous. In MVB 103, the Fuel Pressure Regulator measurement shows -71 in the first picture where as when you hover over it, the reading is suposidly to be between 1300 - 3000 mbar at idle ( or something like that )
I went about my trip and the car done the stutter that I was talking about and when I returened, I carried out a fault code check and found this now :
2 Faults Found:
004506 - Fuel Pressure Sensor (G247)
P119A - 001 - Malfunction
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 3
Mileage: 192505 km
Time Indication: 0
Freeze Frame:
RPM: 845 /min
Load: 13.3 %
Speed: 0.0 km/h
Temperature: 74.0°C
Temperature: 16.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.351 V
008583 - Bank 1; System too Lean at Idle
P2187 - 004 -
Freeze Frame:
Fault Status: 01100100
Fault Priority: 0
Fault Frequency: 2
Mileage: 192505 km
Time Indication: 0
Freeze Frame:
RPM: 838 /min
Load: 13.3 %
Speed: 0.0 km/h
Temperature: 72.0°C
Temperature: 21.0°C
Absolute Pres.: 990.0 mbar
Voltage: 14.224 V
Readiness: 0000 0000
SOOOOO, I have the same fault in and also another fault has appeared lol.
Does this point more towards the sensor itself as the readings are soo far off ?
If the fuel pressure is low, of course it will go lean. This shows that it is not the sensor itself but that the fuel pressure is in fact low.
Ah ok but could the fuel pressure be THAT low and still let the car drive ? Surely the least that it can go is 0 ?
Ok so where does that leave me now ? Do you think to maybe go for the lift pump still ?
EDIT - I get you now, do you mean that the engine is indeed running lean at idle which confirms that there is not enough fuel pressure going into the engine ? I am still confused how it can be as low as -71 though ?
Sorry, forgot to put the picture in :
http://img.tapatalk.com/02de47e5-fa17-af06.jpg
look at the pressure regulator valve as mentioned and actual line pressure before the high pressure pump 6 bar is ideal
If the line pressure before the pump is ok then it rules out the pressure pump and filter
Then I would look at the mechanical valve on the rail hence g247 reading low
Note I have never found g247 defective yet but have found g410 low pressure sensor faulty on occasion but mainly the older part number recall 24m4 covered this sensor
Use this for screen dumps http://www.gadwin.com/printscreen/ so we can see
Dump at idle and then rev to limiter and dump again after the idle has settled
Your rail pressure is ok looking at the pic 51.30 bar electric pump duty cycle seems fine too but if this drops off below 48 bar ish then you have highlighted a drop off
This why I use a inline pressure gauge to rule out defective sensors and you can see what's happening to pre supply
I deal with a lot of remaps and trust me tfsi needs spot on fuel pressure
Ok, I will go and do that now and post the results in a bit
Ok, that is a handy program :Blush:
Here we are :
At idle :
http://i1228.photobucket.com/albums/...eenShot001.jpg
After limiter and returned to idle 1st time :
http://i1228.photobucket.com/albums/...eenShot002.jpg
After limiter and return to idle 2nd time :
http://i1228.photobucket.com/albums/...eenShot003.jpg
Checked after this and no faults reappeared yet ( have not road driven yet since erase )
http://i1228.photobucket.com/albums/...eenShot004.jpg
With the lambda sensor signal having told the ECU that the mixture is actually lean, I think you have an actual low fuel pressure situation rather than a misreading sensor so in the absence of a fuel pressure test gauge I would suggest changing the in tank lift pump first. Also it would be worth giving your local Audi dealer a call to see if your car is subject to or has received Campaign 24M4 under TPI 2017642/2. If the lift pump is not at fault I think the problem will be with the main pressure pump, possibly due to a worn cam/follower and this is relatively easy to inspect.
What is the campaign for Crasher ? When I bought the car ( around 4'000 miles ago ) it had lots of timing problems which turned out to be an incorrectly timed inlet cam due to it being replaced which I assume was because of the lifter at some time rubbing through it. I replaced the lifter while I was repairing the timing to be safe. What sort of money are the pumps ?Quote:
Originally Posted by Crasher