Audi A4 Bad MAF? Or MAF Harness?
#1
Audi A4 Bad MAF? Or MAF Harness?
**Updated**
Hello Everyone,
i am currently having a problem with my 2000 a4 1.8t non Quattro.
i will start from the beginning on how things went down.
about 2 months ago i started feeling a slight misfire and loss of power then i got a few CELs (Fuel Trim: Bank 1 : System too Rich)
and Code P0102 Mass Air Flow (MAF) Circuit Low Input.
thinking that the rich code was because of the MAF sensor i decided to change it.
hooked up my obd2 scanner and cleared the codes.
It ran fine for about a day and then i started to feel a slight misfire again and got more codes
this time i got codes for (Fuel Trim: Bank 1 : System too Lean!),
a code for (random misfire on all cylinders)
and again the P0102 (Mass Air Flow (MAF) Circuit Low Input)
the next day i was driving my car to work and bam. it started misfiring really bad. i looked for vacuum leaks and could not find any. i tried changing the plugs to see if it would help but it didn't. i also tried resetting the ecu but nothing happened
today i unplugged the maf sensor and like magic it started running good again.
i then went home and plugged the MAF back in and it started misfiring.
so today i went and got ANOTHER new MAF and threw it in.
now the car will idle just fine but will not go over 1100 rpms without
giving me codes for random/multiple misfire
i was wondering if you guys have any suggestions
im pretty sure its not a spark or coil pack issue because it will run fine without
the MAF it just runs rich and i get bad MPG
Hello Everyone,
i am currently having a problem with my 2000 a4 1.8t non Quattro.
i will start from the beginning on how things went down.
about 2 months ago i started feeling a slight misfire and loss of power then i got a few CELs (Fuel Trim: Bank 1 : System too Rich)
and Code P0102 Mass Air Flow (MAF) Circuit Low Input.
thinking that the rich code was because of the MAF sensor i decided to change it.
hooked up my obd2 scanner and cleared the codes.
It ran fine for about a day and then i started to feel a slight misfire again and got more codes
this time i got codes for (Fuel Trim: Bank 1 : System too Lean!),
a code for (random misfire on all cylinders)
and again the P0102 (Mass Air Flow (MAF) Circuit Low Input)
the next day i was driving my car to work and bam. it started misfiring really bad. i looked for vacuum leaks and could not find any. i tried changing the plugs to see if it would help but it didn't. i also tried resetting the ecu but nothing happened
today i unplugged the maf sensor and like magic it started running good again.
i then went home and plugged the MAF back in and it started misfiring.
so today i went and got ANOTHER new MAF and threw it in.
now the car will idle just fine but will not go over 1100 rpms without
giving me codes for random/multiple misfire
i was wondering if you guys have any suggestions
im pretty sure its not a spark or coil pack issue because it will run fine without
the MAF it just runs rich and i get bad MPG
Last edited by audia4x4; 04-17-2010 at 02:02 PM. Reason: UPDATED
#8
im using the gapless triple electrode plugs. thats what ive always used in my a4 ever since i got it and never had a problem with them. i even threw in a new pair today just to make sure that wasnt the issue. as for coil packs i dont think thats the issue but ill try it in a few minutes i have a few spares laying around.
Also i read the MAF sensor with my OBD2 scanner and it is reading properly thats why im so confused. i have no clue what to do now
**UPDATE** It is not a coilpack issue i swapped them out and it didnt change a thing
Also i read the MAF sensor with my OBD2 scanner and it is reading properly thats why im so confused. i have no clue what to do now
**UPDATE** It is not a coilpack issue i swapped them out and it didnt change a thing
Last edited by audia4x4; 04-17-2010 at 02:45 PM. Reason: **UPDATE**
#9
the only other thing I could think of is maybe it's fuel. Have you cleaned out injectors, changed fuel filter. Maybe even seafoam... I had this same problem. I ended up using ngk plugs, new coils, new maf, seafoam, fuel filter, and finally erased codes. I don't know which fixed it but I figured it be good to do all that anyway. Have you tried resetting your TB.
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