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My 2006 a4 2.0t is misfiring very rough and it shows 3 codes p0300, p0304 and p310b
Hi everyone I really need your help. I have a 2006 audi a4 2.0t. This is my issues:
One night coming home my car started to sputter and then it started to vibrate heavily.
I got home a ran the vag-com and it threw these codes P0300, P0304 and P310B
I swapped around the coil packs to see if number 4 was the issue, but unfortunately it still says cylinder 4 misfiring. I also went as far as changing the spark plugs and the fuel filter and still no change.
the car is misfiring like crazy to the point it is getting very frustrating.
here iare the faults i pulled from the vag-com.
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Do some data logging on the drive. Measure output of your lpfp and also the fuel rail pressure with rpm. Coil packs can go out together, but it isn't likely. Also check your fuel trims just for more info if you know how.
I hate asking this, but you have checked your cam follower recently?
Unfortunately i did not check the cam follower. I am going to check it today.
The thing is like a day after the car started to misfire the car began to run ok for like a day and a half. Then it went back to misfiring.
Sometime when i go high up in rpm the car stops the misfiring but as soon as it goes back down it struggles and misses again
Originally Posted by chapstick
Do some data logging on the drive. Measure output of your lpfp and also the fuel rail pressure with rpm. Coil packs can go out together, but it isn't likely. Also check your fuel trims just for more info if you know how.
I hate asking this, but you have checked your cam follower recently?
No problem. You do know how to do live data logging right? If you don't I suggest you learn. When you go to engine and look on the bottom left of the screen there's advanced measuring blocks or values...I forget. Then it'll bring you to the next screen where you can choose up to 12 parameters at a time to measure while you drive. Use the turbo setting, it's more streaming. Check to see if your fuel rail pressure isn't cutting in and out. As mentioned earlier, the lpfp duty cycle. If those are okay look at your spark plugs if they're fowled. You may have a bad injector. I'm surprised you haven't bought new coils.
Saturday,29,August,2015,22:35:49:62939
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: Release 12.12.0 (x64)
Data version: 20130910
Address 01: Engine (8E0 910 115 M)
22:35:31
1900 Fuel Consumption Signal
4.82 bar Current Fuel Pressure
49.3 bar Fuel Rail Pressure
83.5 % Electrical Fuel Pump 1
Electrical Fuel Pump 2
0.0 % Correction Factor Fuel
49.9 bar Rail Pressure (specified)
50.6 bar Rail Pressure (actual)
-0.66 bar Rail Pressure Difference
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--------------------------------------------------------------------------------------- This is at 35 to 40 mph
Saturday,29,August,2015,22:39:05:62939
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: Release 12.12.0 (x64)
Data version: 20130910
Address 01: Engine (8E0 910 115 M)
22:38:39
28963 Fuel Consumption Signal
4.55 bar Current Fuel Pressure
58.9 bar Fuel Rail Pressure
81.2 % Electrical Fuel Pump 1
Electrical Fuel Pump 2
0.0 % Correction Factor Fuel
60.2 bar Rail Pressure (specified)
60.2 bar Rail Pressure (actual)
-0.25 bar Rail Pressure Difference
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ This is at 20 mph
Saturday,29,August,2015,22:39:40:62939
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: Release 12.12.0 (x64)
Data version: 20130910
Address 01: Engine (8E0 910 115 M)
22:39:26
17167 Fuel Consumption Signal
4.53 bar Current Fuel Pressure
59.5 bar Fuel Rail Pressure
80.4 % Electrical Fuel Pump 1
Electrical Fuel Pump 2
0.0 % Correction Factor Fuel
58.9 bar Rail Pressure (specified)
58.9 bar Rail Pressure (actual)
0.16 bar Rail Pressure Difference
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Originally Posted by chapstick
No problem. You do know how to do live data logging right? If you don't I suggest you learn. When you go to engine and look on the bottom left of the screen there's advanced measuring blocks or values...I forget. Then it'll bring you to the next screen where you can choose up to 12 parameters at a time to measure while you drive. Use the turbo setting, it's more streaming. Check to see if your fuel rail pressure isn't cutting in and out. As mentioned earlier, the lpfp duty cycle. If those are okay look at your spark plugs if they're fowled. You may have a bad injector. I'm surprised you haven't bought new coils.
That's good, but you posted the freeze frames. What I meant was do a live streaming log. It's going to be saved as a csv file that you can either see the values I excel and also plotted in graph form once you download free vag scope. From rosstech's site. The excel file is going to look like this....
In vagcom go to select/engine/adv measuring value/
and once you get the page to open up you'll see all the different parameters (12 at a time) that you can record. Always log in turbo mode( click top of window) always have rpm. And save them.
I suggest you choose misfire cylinders 1,2,3,4 and fuel rail pressure, electric fuel pump output etc. Look for any fuel cuts vs. misfires.
Based on the little I see is, if you were driving at the time of this freeze frame, you were at 1400-1300 rpm in your second set of inputs. If that is the case your fuel rail pressure looks fine. What does bother me at that and all the other sets of readings you gave is that your lpfp output is about 10% too high. Are you chipped, not sure that would make a difference.
At 1400-1300 you should be around 66-69% on a healthy lpfp. Idle around 68-70%.
So based on what I see it looks like you lpfp is laboring too much. Not sure if this is the culprit, but a dying lpfp definitely will give you cuts. So give it a try with the streaming log and see what you get. Takes some playing around, but once you get the hang of it it's easy. You can save the parameter template by clicking the upper left corner of the SMALL window that pops up in adv measures values.
ok i will try that later and send you the data then.
Also I went into the measuring block section and this is the result
at idle with 840 rpm the fuel rail pressure is 49.5 bar and the electric fuel pump is a 82.4 %
as i go up in rpm these are the readings for fuel rail pressure and fuel pump
rail pressure-----------------------fuel pump
55.7 bar --------------------------80.4%
90.9 bar --------------------------81.2%
105.6 bar -------------------------82.4%
110.1 bar -------------------------83.9%
110.1 bar -------------------------84.7%
112.0 bar -------------------------85.5%
110.1 bar -------------------------86.3%
You can log three at a time(as opposed to 12 in "advanced measuring values") from the engine measuring block window - always use turbo mode to get a more seamless log.
Throttle 3600 rpm ***pay no attention to the lambda regulator % this was taken while I had a vacuum leak. Lambda regulator resets every time you clear codes in the engine control module. The lambda regulator should stay under +/-five to be normal and can get as high as +/-15 I believe(don't quote me). That's when you got problems. Ideally it should float 0 to +/-1***
Throttle 1400rpm
Idle
I'm not sure that the lpfp is definitely the problem. It does look like it's dying, but your current fuel pressure looks decent from what you said.
So get the data log with all the good stuff twelve at a time like I said earlier and look for fuel cuts/irregularities vs. specified. Also get the misfires in cylinders as well. This may take you several runs with several different combination of values to get anything remarkable. Too early to rule out a bunch of stuff.
cam follower needs to be checked & hpfp plunger, lpfp and maybe even the fuel filter for all we know right now. Hope some good logging is more revealing.
you say the fuel pump may be dying but the fuel pressure is ok. I already changed the fuel filter with no change and before i used to get the p0089 code sometimes. It check light use to come on and off.
08-05-2016, 11:01 AM
My 2006 a4 2.0t is misfiring very rough and it shows 3 codes p0300, p0304 and p310b
