rsadamsB5

This is my 2001 a4 2.8 and recently it has been missing under load. doesnt matter what gear it is in either. I pulled 3 codes off the car today and they are

p0441- Evap emission control system incorrect purge flow

p0173- fuel trim malfunction (bank 2)

p0130- o2 sensor circuit (bank 1 sensor 1)

There are no missfire codes...? i have seen the CEL flashing which means missfire and yet not pulling any

So can any of these codes that i pulled make the car missfire?

also the timing belt was just done 3k miles ago but it missed before the belt change and the plugs and wires have been changed within the last 6k miles

rsadamsB5

so today at a stop light it started missing at idle...ignition problem of some kind right?

Could it be bad plugs or wires? The coil pack is bran new...any thoughts would be great.

GTA_Driver

You *likely* are experiencing two issues:

1. Your O2 sensor is dead.
2. Your N80 purge valve is dead.

The purge valve can die on its own, or it can die if your charcoal canister is malfunctioning (as in, it's full of gasoline).

But I don't see why your engine would misfire due to those two issues...

Check out this page for more info on the emission control system, specifically the section "Evaporative Controls".

http://www.familycar.com/Classroom/emission.htm

GTA_Driver

What tool are you using to pull the codes?

How do you know the car is actually misfiring?

rsadamsB5

A OBD scan tool. And i know because i can feel it miss/chug when im accelerating....you cant miss it because it shakes the whole car.

ALLDATAdiy INFO

Did you clear the codes and did they all come back?

rsadamsB5

Yes i cleared them and no they have not returned yet but im sure they will.

But whats weird is they didnt come back after a cold start? isnt that when the evap system is working?

rsadamsB5

CEL came back on after i filled the gas tank?