Mitchellkeller46

I have a 1998 audi a4 2.8 quattro 5 spd and have been fighting a missfire problem for about a month now, I changed coil pack, spark plugs, maf, vacum lines, I recently did a timing belt and water pump as well. As long just did a compression test and every cylinder is good. My missfires are on cylinder 4,5,6. I also did o2 sesnors recently as well I'm just lost at this point and don't know what else to try.

Any input would be great thanks!

Mitchellkeller46

getting code
p0102
p0300
p0304
p0305
p0306
p0151
p1127

Brendon Taylor

I had multiple misfires as well, and then i learned that the MAF can cause that to happen- after a lot of hemming and hawing, i noticed (barely) that one of the wires to the MAF was busted- have to peel back some rubber and plastic, but i would check there to make sure they're all connected all the way- older car, old plastic on the wires that's been heated and cooled a million times and loves cracking and either shorts out or breaks after it gets corroded

clancy

I have the same cracked wires issue on top of the airbox. I was able to save the connections with some added insulation and such. But you are correct, this could easily be overlooked. If so you could spend a lot of time and money replacing parts that are not necessary. Look closely at the old wiring loom.

G_claudz

What is the milage of the car?

Do you still have the original cats?

I had a misfire that was cause by a clogged cat,

You can generally smell a clogged cat, it smells horrible.