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Discussion Starter #1
Good afternoon,

I just started having an issue with the car stumbling at startup. Once I hit the accelerator, it smooths out and as long as I slowly take it back to idle there is no more issue. I haven't done any maintenance in about a month when I replaced the fuel filter. Pulled the filter out to test and it does the same thing with no filter in the line. Any advice is greatly appreciated.

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Vcds measuring Block 13. Mine had the same symptoms when one of my injector seals went bad. Also struggled to start after sitting a couple days.
 

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You can always try to find someone nearby with it. IME, if you want to maintain these cars yourself, your really need it. It's a couple hundred bucks well spent. On most posts, the first response will frequently be "have the car scanned and post it back."
 

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There is no TDI Wiki yet as I've said in your intro.

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.
 

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Discussion Starter #8
I unplugged the MAF and it runs like a new car. Do I need to do anything other than change it out? Could that indicate something else?
 

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That's not uncommon. When you disconnect the MAF the computer defaults to a canned mixture setting which is much more rich. This will just mask the problem, decrease your fuel economy and probably blow more black smoke. There is a chance your maf is bad but that would set a CEL code. And MAF codes are pretty ubiquitous for other actual issues.
 

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Discussion Starter #10
That's not uncommon. When you disconnect the MAF the computer defaults to a canned mixture setting which is much more rich. This will just mask the problem, decrease your fuel economy and probably blow more black smoke. There is a chance your maf is bad but that would set a CEL code. And MAF codes are pretty ubiquitous for other actual issues.
Thanks for the feedback. I did end up with a CEL, but as you mentioned, they can be nebulous. I changed out the MAF this evening and have driven a good 50-60 miles. CEL is gone and the car isn’t smoking/stuttering anymore. I did order a VAG-COM but it hasn’t arrived yet. I’ll run the diags whenI get it and see if anything else is amiss.
 

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Discussion Starter #12
I'm pretty sure if you disconnected your MAF sensor your car would not start.:unsure:
Thanks for posting. At least on the TDIs, the ECU will recognize the loss of signal and use a preset fuel ratio. Car runs fine without the MAF, but isn’t as efficient.
 
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