misfire under load (pulling 3 codes)
Thread Starter
Audiworld Junior Member
Joined: Nov 2011
Posts: 51
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From: Ann Arbor
misfire under load (pulling 3 codes)
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
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
Thread Starter
Audiworld Junior Member
Joined: Nov 2011
Posts: 51
Likes: 0
From: Ann Arbor
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.
Could it be bad plugs or wires? The coil pack is bran new...any thoughts would be great.
AudiWorld Super User
Joined: Aug 2004
Posts: 3,277
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From: Toronto
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
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
Thread Starter
Audiworld Junior Member
Joined: Nov 2011
Posts: 51
Likes: 0
From: Ann Arbor
Thread Starter
Audiworld Junior Member
Joined: Nov 2011
Posts: 51
Likes: 0
From: Ann Arbor
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