04 A4 1.8T Multi/misfire and system too lean

[Colbster04 `]

I recently bought a 2004 A4 1.8t. It had 11 service codes when i bought it. The car would barely drive down the road and sometimes stall while rolling and at idle. I ended up replacing the cam shaft position sensor and the car drove much better and stopped stalling. However, I noticed that the acceleration was next too nothing and when the car is at idle, (more so in park) the emc still throws misfire codes on all 4 cylinders and a system too lean code. Also, for about the first 1 1/2 minutes when its cold it idles perfect and then it goes into misfire mode after that. what i have replaced..

pcv valve
2 faulty check valves
crankcase pressure valve (hockey puck guy)
inspected all hoses and cannot find any cracks, holes, leaks, etc on vacuum system
coils x4
spark plugs
coils wiring harness

I dont have a VAG but when i scan with other scanner i get...

short term fuel maxed out at 25%
long term fuel 0%
MAF 6.0 g/s

i tried unplugging MAF for a couple mins but STFP did not come down or move at all. Also tried pinching all vacuum hoses off and got no results with that experiment. I dont know what else to do at this point. Can anyone help?

[mty12345]

I recently bought a 2004 A4 1.8t. It had 11 service codes when i bought it. The car would barely drive down the road and sometimes stall while rolling and at idle. I ended up replacing the cam shaft position sensor and the car drove much better and stopped stalling. However, I noticed that the acceleration was next too nothing and when the car is at idle, (more so in park) the emc still throws misfire codes on all 4 cylinders and a system too lean code. Also, for about the first 1 1/2 minutes when its cold it idles perfect and then it goes into misfire mode after that. what i have replaced..

pcv valve
2 faulty check valves
crankcase pressure valve (hockey puck guy)
inspected all hoses and cannot find any cracks, holes, leaks, etc on vacuum system
coils x4
spark plugs
coils wiring harness

I dont have a VAG but when i scan with other scanner i get...

short term fuel maxed out at 25%
long term fuel 0%
MAF 6.0 g/s

i tried unplugging MAF for a couple mins but STFP did not come down or move at all. Also tried pinching all vacuum hoses off and got no results with that experiment. I dont know what else to do at this point. Can anyone help?

Fuel filter blocked maybe? or some other issue meaning there is a lack of fuel, weak pump or similar

[brendontaylor]

I would check the wires to the MAF plug- i had same issues, and one of the wires was broken... unplugging the MAF should have made some sort of a difference as well- MAF can throw misfire codes on all 4 cyl, and would also explain the rich fuel- good luck!

[AudiTecnik]

On the top of the intake near the back there's a intake part, has three hoses attached to it, use soapy water and spray the seal around it, I'm having issues with mine right now, cause misfires at idle when warm, worth a check

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[AudiTecnik]

Check this link. http://www.audizine.com/forum/showthread.php?p=11859642

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