All Things Mk5 > Mk5 General Area
disappointing performance continued....UPDATED after a day at MRC Tuning
RunRabbit:
For it to be overfuelling on a std map and aftermarket map then there's something consistantly wrong with the car and not the map. It's either got a boost leak and chucking in fuel for the amount of air it expects to recieve, the MAF is faulty and telling the ECU that there's more air than there is or the O2 sensor is telling the ECU that the there's not enough fuel in the exhaust fumes and chucking in more to compensate.
I can't see a lot else being wrong tbh, there's only certain reasons that a car really overfuels
duncan:
how can you diagnose where the problem is coming from? all through VAGCOM while driving the car?
am told that there is nothing wrong with the MAF but will get them to check again..
no chance its the second PCV that hasnt been replaced?
QD MBE:
--- Quote from: WhiteGTI on March 31, 2009, 09:02:14 pm ---
--- Quote from: stokeballoon on March 31, 2009, 08:57:18 pm ---What did he say about the MAF? May be worth plugging another one in, just to test. I think a sensor is fooling the ECU into thinking it needs to fuel. Is the Air filter ok? Bear in mind where the car was imported from, that sand gets everywhere...........
--- End quote ---
I think theres been a mixup along the way with his documented engine code...because cars are LHD in the UAE, therefore meaning that his car can't have come from there :smiley:
--- End quote ---
the fact that UAE is LHD is not a reason for the car to have not been imported via there. A lot of BIG dealerships buy cars and stockpile them.
On thread, I hope you get it sorted. I still think that something is telling the brain (ECU) to send more fuel, so the ECU is doing as it is told. All the ECU does is act like a big calculator, lots of inputs, and several outputs.
:confused:
RunRabbit:
--- Quote from: duncan on March 31, 2009, 10:06:42 pm ---how can you diagnose where the problem is coming from? all through VAGCOM while driving the car?
am told that there is nothing wrong with the MAF but will get them to check again..
no chance its the second PCV that hasnt been replaced?
--- End quote ---
Could well be the second PCV, it's worth looking at before you start looking at bigger things.
Borrow a fellow members MAF and O2 sensor, I don't know how long they take to change on the TFSI but I can't imagine it being long.
Phil Mcavity:
Maybe the ECU is faulty?
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