|
D3 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Some thoughts ...
Before the fuel pump module was replaced would the car do the fault regularly or could it behave itself for along time ? If it was playing up regularly it seems to much of a coincidence to behave for 3 weeks without faulting You say after the fuel pump module was replaced all seemed well and you have had a good few miles done to confirm that it was good ? What if either of the In tank pumps are pulling to much current and over loading the pump control module and when the pumps cool back down this allows the module to work correctly again . I would be scoping the heavy wires to the In tank pumps and see what they are pulling out and the current ripple may show a bad armature . Some of the bigger mercs albeit diesels that have stirrup type fuel tanks had an issue where one side of the tank would empty itself ..... this would cause the submerged pump to over heat and burn the relay contacts . This fault was caused ultimately because the high pressure diesel pump was at fault and not returning enough fuel to one side of the tank . As with any module failure you have to ask why has it failed ....,is there an underlying fault ?? Does the fuel control module vary the voltage to the in tank pumps as engine demand increases ? From a diagnostic point of view I would be looking at fuel pressure .... compare to spec then when car faulted see what's happening to the pressure at that point . |
#12
|
|||
|
|||
Was intermittent seemingly random cutting out which would stop car starting for an hour or so but then would start up again fine.
Did two 170 mile runs in the car with little obvious issues save fire it doing 29 mpg on the way there and just 24 on the way back despite driving it the same on the same roads. The morning after the lower mpg run it cut out. When driving slow and steady at say 1300rpm the revs would oscillate by 1/200rpm even under constant load. Sily point but will mention it seems to have cut out almost exclusively when turning hard right! |
#13
|
||||
|
||||
Wouldnt that point to the fuel not being properly transferred from one side of the tank to the other so that the empty tank is then supplying the engine with not enough fuel?
__________________
Confidence is the feeling you have before you know better . . . . Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs |
#14
|
|||
|
|||
Quote:
Now that I think of it, when I was listening to the pumps individually the left side had both the sound of the pump (the low buzzing hum) and the sound of fuel trickling like a small waterfall. Right side had only the pump sound. |
#15
|
|||
|
|||
Turning hard right thing .......water in a module ?
Is comfort module on floor under pass side carpets ? |
#16
|
|||
|
|||
Well passenger footwell did get water ingress so possible the stuff under the carpet is wet, but would the comfort module relate to the engine cutting out?
|
#17
|
||||
|
||||
Most of us feel uncomfortable when the engine cuts out!
__________________
Confidence is the feeling you have before you know better . . . . Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs |
#18
|
|||
|
|||
Haha!
|
#19
|
|||
|
|||
When you say plenum chamber flooded with water you are on about the rear bulkhead ? is the engine ecm in there ??
|
#20
|
|||
|
|||
Under windscreen area I was told had a lot of water in it and blocked drain holes
|
|
|