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Thread: Car won't want to start (sometimes)

  1. #1
    been around the block a few times EK20 is a jewel in the rough EK20 is a jewel in the rough EK20's Avatar
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    Car won't want to start (sometimes)

    So randomly the car will not want to start without putting up a fight. It only seems to happen later on at night. After not wanting to start but eventually starting, if she sits overnight she'll start up just fine and run perfectly the next day.

    Car: 2004 A6 2.7T S-line (w/ ~110,000 miles)

    Recent repairs: New aftermarket front axles, new head gaskets, pretty much all new front suspension, new alternator, new windshield (and cowling), new battery. Everything but the suspension bits and alternator were installed at Barrier.

    Modifications: APR stage 1 chip, APR exhaust, APR Bi-Pipe Kit, APR diverter valves, H&R Coilovers, Stoptech pads and rotors. All modifications were done at Achtuning.

    Faults:

    19537 - Engine Temp too low
    P3081 - 35-10 - Intermittent

    16684 - Random/Multiple Cylinder Misfire Detected
    P0300 - 35-10 - Intermittent

    16687 - Cylinder 3
    P0303 - 35-10 - Misfire Detected - Intermittent

    16688 - Cylinder 4
    P0304 - 35-10 - Misfire Detected - Intermittent

    18010 - Power Supply Terminal 30
    P1602 - 35-10 - Voltage Too Low - Intermittent

    Readiness: 0000 0000

    She drives and behaves fine 98% of the time, but that other 2% she lets her German heritage show.
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  2. #2
    everyone probably knows me by now Jazzydub has a spectacular aura about Jazzydub has a spectacular aura about Jazzydub's Avatar
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    Quote: Originally Posted by EK20 View Post

    She drives and behaves fine 98% of the time, but that other 2% she lets her German heritage show.
    Haha!



    Anytime I have a problem that is inconsistent I always assume it's something electrical like a sensor. Of course most the time I have no clue what's wrong with my car.

  3. #3
    been around the block a few times EK20 is a jewel in the rough EK20 is a jewel in the rough EK20's Avatar
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    Quote: Originally Posted by Jazzydub View Post
    Anytime I have a problem that is inconsistent I always assume it's something electrical like a sensor. Of course most the time I have no clue what's wrong with my car.
    Yeah, my first guess is something electrical. I'm sure those damn coilpacks are involved somehow.
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  4. #4
    make car go faster guy Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v's Avatar
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    What does no start mean? Long cranking? no cranking? Need more info. Also, why were the headgaskets replaced? Seems like a rather odd failure.

  5. #5
    Normal Member AlexPirate will become famous soon enough
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    TPS adapt?
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  6. #6
    been around the block a few times EK20 is a jewel in the rough EK20 is a jewel in the rough EK20's Avatar
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    Quote: Originally Posted by Rabbit 16v View Post
    What does no start mean? Long cranking? no cranking? Need more info. Also, why were the headgaskets replaced? Seems like a rather odd failure.
    It'll crank and crank, but it won't turn over. The headgaskets were replaced because they were leaking. At least they damn well better have been because that wasn't a cheap job.
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  7. #7
    Coilpack have any cracks in it? Is there any signs of water damage around the ECU compartment? Corrosion on the harness/ecu connector?
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  8. #8
    been around the block a few times EK20 is a jewel in the rough EK20 is a jewel in the rough EK20's Avatar
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    Hmm, I haven't taken a close look at the coilpacks yet. Water damage is possible since there was a leak under the cowling piece at the bottom of the windshield, which is why it was replaced. The water was never left long before being sucked up, but that is very possible the cause.
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    "I cannot sleep unless I am surrounded by books."
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  9. #9
    My ideas were just a corrosion shot in the dark. I know that water is prone to collect in the cowl by the ECU. And by the intermittent nature of the problem, as stated by Jazzydub, I was also thinking electrical/corrosion. I'd check all the spark-related connectors and signal-bearing connectors in general.

    And those coilpack bricks are prone to melting, cracking etc and I've seen weird symptoms as a result. And it's a quick check, you can normally visually inspect it and check it off the list.
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  10. #10
    make car go faster guy Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v's Avatar
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    Quote: Originally Posted by EK20 View Post
    It'll crank and crank, but it won't turn over. The headgaskets were replaced because they were leaking. At least they damn well better have been because that wasn't a cheap job.
    Never seen leaking headgaskets. Just from my experience. I have seen lots of leaking valve cover gaskets and cam seals, but never a leaking head gasket.

    As far as the leak goes, are you sure it wasnt coming from the seal for the ECU box or the box for the cabin filter? That is usually the water leak culprit.

    Anyway, back to your problem at hand. This is a classic symptom of a failing coolant temp sensor. A failing CTS will make for incorrect fuel mixture and that leads to misfires. Usually a failing ignition coil will present itself under load or when the engine is warm, or both. Not common to see a failing coil when starting cold and have it go away after it is warm. Do you have VCDS?

  11. #11
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    I'm not sure why I said head-gaskets, I meant the valve cover gaskets.

    As for the leak, yeah, it was coming in from the cowl piece. There was a large gap between the windshield and the cowl. Plus the windshield was mounted too low and nothing lined up there properly. The water was leaking in from there into the cabin filter and then into the front passenger foot well.

    I've had bad coilpacks before, so I know what usually happens, but that was my best uneducated guess offhand. Is the CTS easy/cheap to diagnose or replace? And what about the engine temp sensor?
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  12. #12
    been around the block a few times EK20 is a jewel in the rough EK20 is a jewel in the rough EK20's Avatar
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    Quote: Originally Posted by Twelvizm View Post
    And those coilpack bricks are prone to melting, cracking etc and I've seen weird symptoms as a result. And it's a quick check, you can normally visually inspect it and check it off the list.
    I will be sure to do that. I hope to have some time tomorrow to do that. If there isn't a TSB out for those little shits, there should be. As often as they seem to fail.
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  13. #13
    been around the block a few times unimogken has a spectacular aura about unimogken has a spectacular aura about unimogken's Avatar
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    I read this on my phone and I was going to post earlier but I'm late to the party now and it sounds like you got it kinda sorted out.

    I was going to say that it could be a ground that might of not been hooked up after your gasket replacement?

    Darn fancy cars with all of these electronics!

  14. #14
    everyone probably knows me by now Jazzydub has a spectacular aura about Jazzydub has a spectacular aura about Jazzydub's Avatar
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    If the CTS on that is anything like a 1.8t or 2.0 then they're super easy and pretty cheap. Took me like 10 minutes to switch mine out and most of that time was trying to find the clip I dropped.

  15. #15
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    That's good to hear. It looks like ECS has them for $17.64, and that's for the genuine VW/Audi part.
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  16. #16
    make car go faster guy Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v's Avatar
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    Quote: Originally Posted by EK20 View Post
    I'm not sure why I said head-gaskets, I meant the valve cover gaskets.

    As for the leak, yeah, it was coming in from the cowl piece. There was a large gap between the windshield and the cowl. Plus the windshield was mounted too low and nothing lined up there properly. The water was leaking in from there into the cabin filter and then into the front passenger foot well.

    I've had bad coilpacks before, so I know what usually happens, but that was my best uneducated guess offhand. Is the CTS easy/cheap to diagnose or replace? And what about the engine temp sensor?
    Ok, yeah, valve cover gaskets make much more sense hopefully you had the cam adjuster gasket replaced as well at the same time (cam plugs too). I have heard of it leaking through cowl area as well, but usually only with an aftermarket windshield, so that could be the case there.

    The CTS is pretty cheap ($13 IIRC), and according to the book, it should only take half an hour. However, it is located on the back of the cylinder head on the passenger side. I think the labor guide is full of shit because if you have EGR valves, then it is not so easy to get to. The CTS IS the engine temp sensor as well as the sensor for the gauge.

    Quote: Originally Posted by EK20 View Post
    I will be sure to do that. I hope to have some time tomorrow to do that. If there isn't a TSB out for those little shits, there should be. As often as they seem to fail.
    There is actually a recall for them. Twelvism, his car has ignition coils and not the coilpack.

    Quote: Originally Posted by Jazzydub View Post
    If the CTS on that is anything like a 1.8t or 2.0 then they're super easy and pretty cheap. Took me like 10 minutes to switch mine out and most of that time was trying to find the clip I dropped.
    yeah, not so easy especially if he loses the clip!

  17. #17
    Quote: Originally Posted by Rabbit 16v View Post
    yeah, not so easy especially if he loses the clip!
    Or if he forgets to take out the old o-ring before putting the new one in. If you don't do that, you run the risk of looking like a f&%&ing moron in front of fine tuning when you're basically doing push ups on the sensor trying to seat the sensor in the housing. Still can't believe I didn't break the flange off.
    bitches catchin feelings like will i am

  18. #18
    make car go faster guy Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v's Avatar
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    I saw nothing...

  19. #19
    Quote: Originally Posted by Rabbit 16v View Post
    Twelvizm, his car has ignition coils and not the coilpack.
    I was getting confused with the 2.6. NewB!
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  20. #20
    make car go faster guy Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v's Avatar
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    Whoa. 2.6? Is that new?

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  22. #22
    make car go faster guy Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v is a jewel in the rough Rabbit 16v's Avatar
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    I have never seen a 2.6 VWaG engine...

  23. #23
    Seriously? 2.6 V6 12v SOHC used on B4's and B5's


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  24. #24
    been around the block a few times unimogken has a spectacular aura about unimogken has a spectacular aura about unimogken's Avatar
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    Did you get this figured out yet?

  25. #25
    been around the block a few times EK20 is a jewel in the rough EK20 is a jewel in the rough EK20's Avatar
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    Quote: Originally Posted by Rabbit 16v View Post
    I have heard of it leaking through cowl area as well, but usually only with an aftermarket windshield, so that could be the case there.
    Yeah, I'm pretty sure the old windshield was aftermarket. I'll look and see if I can even see the CTS.
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