Calling all block 032 gurus...
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AudiWorld Super User
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Calling all block 032 gurus...
I'm trying to diagnose an issue with my wife's Passat and have posted the question and some block 32 numbers from a scan, over on the A4 forum.
So if you're inclined, please take a look see and tell me what you think...
TIA,
~john<ul><li><a href="https://forums.audiworld.com/a4/msgs/2713948.phtml">Take a peek here.</a></li></ul>
So if you're inclined, please take a look see and tell me what you think...
TIA,
~john<ul><li><a href="https://forums.audiworld.com/a4/msgs/2713948.phtml">Take a peek here.</a></li></ul>
Rest In Peace
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part throttle is WAY out...anything over 10 +/- >>
is a problem.....at that level i am surprised you have not gotten a CEL...
If you measure block 002 and check your g/sec (you will need to log it at speed....3rd gear pull is good) and see what it comes back as....Anything less than 160, and that could be your problem, a bad MAF....
Start from there and repost results....
If you measure block 002 and check your g/sec (you will need to log it at speed....3rd gear pull is good) and see what it comes back as....Anything less than 160, and that could be your problem, a bad MAF....
Start from there and repost results....
AudiWorld Super User
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Could be a failing MAF or vacuum leak...>>
Part throttle is way lean. You should be a little on the rich side.
Try this - disconnect the MAF and take it for a drive, if the car seems better, chances are it's bad. You will get a CEL but you can clear it with the VAG.
Another thing to try after reconnecting the MAF and clearing the CEL, is to log and record block 002 and do a WOT in 2nd or 3rd between 2000 RPMs and 6000. Look at hte g/sec reading and it should read around 150 or above at 5000 or higher. If it is around 120 or lower, it's toast.
If the car runs the same, you probably have a vacuum leak somewhere.
Just my $0.02
Try this - disconnect the MAF and take it for a drive, if the car seems better, chances are it's bad. You will get a CEL but you can clear it with the VAG.
Another thing to try after reconnecting the MAF and clearing the CEL, is to log and record block 002 and do a WOT in 2nd or 3rd between 2000 RPMs and 6000. Look at hte g/sec reading and it should read around 150 or above at 5000 or higher. If it is around 120 or lower, it's toast.
If the car runs the same, you probably have a vacuum leak somewhere.
Just my $0.02
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From: Boise, Idaho
You're reading it backwards (maybe...) -->
a positive number in block 32 means that the car is trying to correct a lean condition, not that it is running lean. This means your ECM is adding fuel above the map level.
Likely culprit? MAF producing low g/s values (which is its failure mode). Causes the ECM to think less air is entering the system than actual. That causes the lean condition. The ECM can correct up to +/- 20%. As others have stated, +/- 10% is ideal. So you are just out of the ideal range.
Shudder in first? Could still be the clutch. at 89K, your clutch could be done. Sudden onset clue could simply be a bad tank of gas.
Likely culprit? MAF producing low g/s values (which is its failure mode). Causes the ECM to think less air is entering the system than actual. That causes the lean condition. The ECM can correct up to +/- 20%. As others have stated, +/- 10% is ideal. So you are just out of the ideal range.
Shudder in first? Could still be the clutch. at 89K, your clutch could be done. Sudden onset clue could simply be a bad tank of gas.
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Block 002 readings during WOT runs... what do you think?
Ok, I did a couple of WOT runs in 2nd and 3rd gears (and didn't get a ticket). They say air mass should peak about 80% of horsepower and the 1.8t engine in this Passat is a 170hp version, so 80% of that number is 136 (car is completely stock)
Run 1 (2nd gear)
. air mass readings start approx 22 g/sec at 2000 rpm
. @5000rpm, it's about 115 g/sec
. peaks at 132 g/sec @6000rpm
Run 2 (3rd gear)
. air mass again about 115 g/sec @5000rpm
. peaks at 124 g/sec @5360rpm when I lifted off because I was approaching an intersection...
Run 3 (2nd gear again)
. air mass again about 115 g/sec @5000rpm
. peaks at 131 @6000rpm
<b>What do you think?</b>
Relatively consistent, at least... I haven't disconnected the MAF for a test drive because it's a royal PITA to do on a stock Passat or A4. It's buried inside the air cleaner which is sealed tighter than Pharaoh's tomb. There is an inspection port and I will see if I can use that to disconnect it.
Run 1 (2nd gear)
. air mass readings start approx 22 g/sec at 2000 rpm
. @5000rpm, it's about 115 g/sec
. peaks at 132 g/sec @6000rpm
Run 2 (3rd gear)
. air mass again about 115 g/sec @5000rpm
. peaks at 124 g/sec @5360rpm when I lifted off because I was approaching an intersection...
Run 3 (2nd gear again)
. air mass again about 115 g/sec @5000rpm
. peaks at 131 @6000rpm
<b>What do you think?</b>
Relatively consistent, at least... I haven't disconnected the MAF for a test drive because it's a royal PITA to do on a stock Passat or A4. It's buried inside the air cleaner which is sealed tighter than Pharaoh's tomb. There is an inspection port and I will see if I can use that to disconnect it.
Rest In Peace
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it is not a dead MAF that is for sure.....>>>
looks like the next thing is a vacuum leak. Could explain the shutter too.....if you have one of schwing's pressure testers or have access to one....that is a great tool.....
with the mileage you have on it, rubber hoses could be getting a bit dry......
with the mileage you have on it, rubber hoses could be getting a bit dry......
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