Fuel Pumps
Re: Fuel Pumps
Thank you very much for the detailed response that I still need to read carefully. Just a quick reply regarding the waste gate as they are new from last year. Need to check more carefully the hoses though.. Many thanks again!
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
Why were the waste gates replaced? Were the new ones load balanced?
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."
///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."
Re: Fuel Pumps
Preventive maintenance when I bought the car. They are new from Audi. Still have the old ones to compare if need be, but as you rightly pointed out, how would that explain the discrepancies at idle..?
And it still puzzles me to see the discrepancies appear ONLY when the engine reaches 85°c, otherwise they are perfectly matched starting from cold !! Any engine control triggered at this temperature that could explain this?
And it still puzzles me to see the discrepancies appear ONLY when the engine reaches 85°c, otherwise they are perfectly matched starting from cold !! Any engine control triggered at this temperature that could explain this?
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
It might be that the engine is running richer when it's warming up and this is masking the discrepancies somewhat. Hard to say.
If it's definitely to do with engine temp, then it could be emissions systems related. N80, EVAP, carbon canister, no-return valves. Can't remember what you already checked on this.
Or maybe, there is an issue with the pre-cat / cat on one side that has partially melted or deformed and is causing a restriction when cold. This could cause the wastegate of that turbo to open at a lower pressure than the other and cause an imbalance in the MAFs. Doesn't sound particularly likely.
Do you have a spare coolant temp sender? You could keep it at room temperature, then, when the engine is warm connect the loom to the spare sensor instead of the one immersed in the coolant. If the problem comes back, then this implies something that is actuated by the ECU rather than a mechanical issue. You might want to fabricate an extension lead for the connector so as to avoid burned arms.
Obvs you'd stop the engine to change over.
Do the new wastegates from Audi need pre-load balancing? Or are they factory adjusted? I have no idea. How difficult would it be to put the old wastegate actuators back on?
If it's definitely to do with engine temp, then it could be emissions systems related. N80, EVAP, carbon canister, no-return valves. Can't remember what you already checked on this.
Or maybe, there is an issue with the pre-cat / cat on one side that has partially melted or deformed and is causing a restriction when cold. This could cause the wastegate of that turbo to open at a lower pressure than the other and cause an imbalance in the MAFs. Doesn't sound particularly likely.
Do you have a spare coolant temp sender? You could keep it at room temperature, then, when the engine is warm connect the loom to the spare sensor instead of the one immersed in the coolant. If the problem comes back, then this implies something that is actuated by the ECU rather than a mechanical issue. You might want to fabricate an extension lead for the connector so as to avoid burned arms.
Obvs you'd stop the engine to change over. Do the new wastegates from Audi need pre-load balancing? Or are they factory adjusted? I have no idea. How difficult would it be to put the old wastegate actuators back on?
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."
///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."
Re: Fuel Pumps
I still didn't have some time to work on the car, but you mentioned many paths to follow, thank you very much for all this! 
Good news is that I have all spare parts to do the tests (coolant temp sensors and dump valves) with the exception of the PCV valves that I will order asap.
Can't tell yet if it could explain my problems, but I just found a serious crack in the left PCV hose. More later..
Good news is that I have all spare parts to do the tests (coolant temp sensors and dump valves) with the exception of the PCV valves that I will order asap.Can't tell yet if it could explain my problems, but I just found a serious crack in the left PCV hose. More later..
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
This sounds promising.
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."
///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."
Re: Fuel Pumps
But that would be too easy, wouldn't it?
I still need to properly change the hose, but a temporary repair didn't change anything, so no we're still not there...
I was just about to organize the coolant sensor test mentioned by Shoppinit a few posts above when I noticed a constant ticking of the N249 actuator (078906283A), along with a distinct 'hooooooo' type of sound coming somewhere from underneath the manifold. From several readings on the net, I've learnt this could come from the suction jet pump (part 1 on the image below) which is known to fail on our cars. How would you confirm the diagnosis?
Last edited by Classik on Fri May 17, 2019 5:50 pm, edited 1 time in total.
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
The charcoal canister box (left of the engine, underneath the N80) doesn't seem in good shape either. Remember the N80 was also ticking like mad before I changed it.
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
Hmm. Why would the N249 be ticking at idle? Maybe it's supposed to, but I can't think why.
The suction jet thing is just a venturi with a non-return valve integrated. It could be broke, as could any of the non return valves. Maybe you should just replace it all.
The suction jet thing is just a venturi with a non-return valve integrated. It could be broke, as could any of the non return valves. Maybe you should just replace it all.
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."
///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."
Re: Fuel Pumps
Forgot to say the car is equipped with new (last year) downpipes with high flow cats (no pre cats), so it would be a very unfortunate situation if one side was blocked, but I've learnt to never say never..
Last edited by Classik on Fri May 17, 2019 11:56 pm, edited 1 time in total.
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
I'm starting to seriously dislike your car.
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."
///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."
Re: Fuel Pumps
Yeah, tell me about it..
Nevertheless I have a kind of 'almost there' kind of feeling, this thing called hope, maybe.
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
Sure! Except that it's not a 5 minutes job, so I wanted to double check the diagnosis before making my mechanic richer than needed..
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
I think you need to make more use of the pressure tester you bought. If you set the pressure at the compressor to 0.5 bar and let it blow, try to figure out where the leaks are. The compressor can hopefully keep up. Sure, some will probably leak into the exhaust, but you might be able to detect some other leaks by listening carefully around the manifold and vac components, maybe using an improvised stethoscope.
You can also get smoke machines (no need to go to rue St Denis) to put smoke into the inlet. It's a low pressure test, but has the advantage of being a visible test. This looks like the cheapest commercially available device:
https://www.ebay.fr/itm/AUTOOL-SDT106-S ... 3840720869
It runs using baby oil. I've seen home made jobbies on ebay that make me suspect it's just a very simple 12v heating element that heats baby oil (that's oil for babies, not oil made from babies) to generate smoke then use a fan to blow it through the tube.
https://www.ebay.co.uk/itm/SMOKE-Machin ... SwoahcymJ9
Looks pretty easy to make.
/Holy <beep>, just came across this. I MUST build one!
https://www.instructables.com/id/BEST-A ... Can-Build/
//Also, you could even use some UltraTraceUV to make smoke that shows up under UV light.
I wonder if you could use a standard compressed air lubricator to diffuse UltraTraceUV into the compressed air stream so you could use it with your Sealey kit.
https://www.amazon.co.uk/d/Air-Tool-Acc ... B00HNVJ852
You can also get smoke machines (no need to go to rue St Denis) to put smoke into the inlet. It's a low pressure test, but has the advantage of being a visible test. This looks like the cheapest commercially available device:
https://www.ebay.fr/itm/AUTOOL-SDT106-S ... 3840720869
It runs using baby oil. I've seen home made jobbies on ebay that make me suspect it's just a very simple 12v heating element that heats baby oil (that's oil for babies, not oil made from babies) to generate smoke then use a fan to blow it through the tube.
https://www.ebay.co.uk/itm/SMOKE-Machin ... SwoahcymJ9
Looks pretty easy to make.
/Holy <beep>, just came across this. I MUST build one!
https://www.instructables.com/id/BEST-A ... Can-Build/
//Also, you could even use some UltraTraceUV to make smoke that shows up under UV light.
I wonder if you could use a standard compressed air lubricator to diffuse UltraTraceUV into the compressed air stream so you could use it with your Sealey kit.
https://www.amazon.co.uk/d/Air-Tool-Acc ... B00HNVJ852
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."
///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."
Re: Fuel Pumps
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."
///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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