Hello. I have problem Whit higher fuel consumption and missing power in low rpms. City driving bc shows more than 6L/100km There isn't any DTC stored to. I did change everything map,maf,n75 and adjust timing because in idle it was consuming 1.4L/h,now 1.0, should be 0.4 as I know. . Any idea were problem could be? I did cleaning for EGR and disconnected after.
75hp 1.4tdi high fuel consumption
- Thread starter Edd112
- Start date
Fuel filter is new,hoses are new from silicone. I had changed maf to Brad New. Nothing changed. Torsion value did set to 2.2
D
Deleted member 14916
Guest
Hello edd112,
I have been experiencing high fuel consumption from a 1.4 TDI 75 for a few years. I would get 500 miles to a tank but it kept lowering. Was at 450 miles for many months then it got worse. Less than 400 miles per tank.
Over the years I kept trying different second hand MAF sensors that seemed to work but then failed.
I cut back into the loom recently and rewired the MAF connector plug and around the same time got a second hand MAF sensor.
Previously the car was running with the MAF constantly unplugged. Because when it was plugged in fuel consumption was high.
I also decided to find where my oil leaks were coming from.
They were the crank sensor o-ring seal.
The upper and lower o-ring seals on the oil filler pipe.
For air tightness of the engine the two oil filler caps were replaced with new ones.
I cleaned the fuel guage sender/ pick up by removing it from the fuel tank and checking for debris in the filter screens.
Fitted fuel hoses where I thought they were required, but went back to the Audi ones as they are good quality.
A brand new Bosch fuel pump and gasket.
The EGR was cleaned and an EGR delete kit added.
Replaced the injectors and installed new o-ring seals.
Fitted a second hand turbocharger.
New new front section exhaust.
New glow plugs.
Did regular service of fuel, air and oil filter.
Put in new oil and an oil treatment for noisy lifters last month.
New N75 valve and all the pipework.
I rechecked the work I had done on the N75 and found I had messed up.
The long plastic hose that goes back to the air intake before the MAF was looking bad so I replaced the whole run with a silicone hose.
I had also put the hoses on the wrong way, so I swapped them back to the correct ports.
Turbo pressure hoses all checked and o-ring fitted to the intake side of turbo pipework.
New intercooler.
New crank sensor and the cam sensor fitted.
Coolant temperature sensor has been replaced once a year for the past 5 years.
Fuel temperature sensor renewed.
Ok, it's a big list but only recently has my fuel consumption improved with the
Second hand MAF sensor
Coolant temperature sensor
Sealing the engine with the new o-rings and oil caps.
Checking my fuel lines are secure and in good condition.
I think I would say the fuel lines need to be 100% leak free. People have said that a short section of clear fuel line between the fuel rail and the top intake of the fuel pump will show any bubbles of air being drawn into the fuel supply.
A cost effective easy test to know if your injectors are getting good fuel pressure from the pump.
All the best,
Andrew
I have been experiencing high fuel consumption from a 1.4 TDI 75 for a few years. I would get 500 miles to a tank but it kept lowering. Was at 450 miles for many months then it got worse. Less than 400 miles per tank.
Over the years I kept trying different second hand MAF sensors that seemed to work but then failed.
I cut back into the loom recently and rewired the MAF connector plug and around the same time got a second hand MAF sensor.
Previously the car was running with the MAF constantly unplugged. Because when it was plugged in fuel consumption was high.
I also decided to find where my oil leaks were coming from.
They were the crank sensor o-ring seal.
The upper and lower o-ring seals on the oil filler pipe.
For air tightness of the engine the two oil filler caps were replaced with new ones.
I cleaned the fuel guage sender/ pick up by removing it from the fuel tank and checking for debris in the filter screens.
Fitted fuel hoses where I thought they were required, but went back to the Audi ones as they are good quality.
A brand new Bosch fuel pump and gasket.
The EGR was cleaned and an EGR delete kit added.
Replaced the injectors and installed new o-ring seals.
Fitted a second hand turbocharger.
New new front section exhaust.
New glow plugs.
Did regular service of fuel, air and oil filter.
Put in new oil and an oil treatment for noisy lifters last month.
New N75 valve and all the pipework.
I rechecked the work I had done on the N75 and found I had messed up.
The long plastic hose that goes back to the air intake before the MAF was looking bad so I replaced the whole run with a silicone hose.
I had also put the hoses on the wrong way, so I swapped them back to the correct ports.
Turbo pressure hoses all checked and o-ring fitted to the intake side of turbo pipework.
New intercooler.
New crank sensor and the cam sensor fitted.
Coolant temperature sensor has been replaced once a year for the past 5 years.
Fuel temperature sensor renewed.
Ok, it's a big list but only recently has my fuel consumption improved with the
Second hand MAF sensor
Coolant temperature sensor
Sealing the engine with the new o-rings and oil caps.
Checking my fuel lines are secure and in good condition.
I think I would say the fuel lines need to be 100% leak free. People have said that a short section of clear fuel line between the fuel rail and the top intake of the fuel pump will show any bubbles of air being drawn into the fuel supply.
A cost effective easy test to know if your injectors are getting good fuel pressure from the pump.
All the best,
Andrew
