Question about 2003 Volkswagen Passat

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2.0 petrol..juddering when i accelerate and engine management light flashes

When i try to accelerate..the engine judders, slowly speed up and the engine management light flashes...what are the fault??...i also notice the breather pipe leaks but not sure if it links to the problem?

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I agree that it is likely a coil. They are only $23 at Autozone, though I buy OEM parts from autohausaz.com. The light will blink when it is a sever firing error. However, it may not throw a permanent code until the coil is completely dead. If your engine light is on, have Autozone check if it is the coil they can tell you which one. The 03 has no ignition module so that isn't failing (they had them pre-02).

Changing a coil needs no tools... just unplug the wire from the coil, and pull the coil off the spark plug. 1 minute tops. Push the new one back on and plug the wire on. No service bay needed... it's literally a 5 minute job at most. You need a quarter to undo the big plastic screws that cover the engine... there are 3... easy peasy.

Do not drive the car much like this because that one cylinder is not burning gas, so your catalytic converter is. In doing so, it will glow red hot and then fail, and then you get to buy a new cat which is very pricey... like $2500 installed. So a $23 coil is much better.

You can figure out what coil it is by unplugging the wire from each coil while the engine is running. DO NOT UNPLUG COIL FROM SPARK PLUG. You can do more harm that way. When you unplug the coil, either the engine will run worse (good coil unplugged) or not change (bad coil unplugged). If no change, that's the one you change.

If you car is approaching 90K miles, just change all of them. Then you don't have to do this test, and you don't have to go through this problem every 10,000 miles.

It _could_ be a bad plug, but likely not. The chance it's a bad wire is also small.

The only trick in all this is the plug has a little tab on it. If the tab breaks off, don't worry. I have driving 30,000 miles with broken tabs. If you are very worried, use a wire tie to hold it on. But you don't need to.

Posted on Apr 01, 2014

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Posted on Jan 02, 2017

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cj5470110
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SOURCE: I have a 1.8T golf gti mk4, last night is juddered

im willing to bet that you had a coil pack fail on you. they are one of the most common failures on the 1.8t engine. another thing i would check is for any boost hoses that may have popped off if you were accelerating quickly.


but before you go and buy a new coil pack. unplug your maf sensor and see if it runs any better than before. if the problem goes away when you unplug you maf then the mass air flow sensor is bad. but if its the same then you have a bad coil pack.

Posted on Jul 11, 2009

alicantecoli
  • 22246 Answers

SOURCE: engine management light has come on, juddering ad

water problem ??? lift bonnet and have a look

Posted on Apr 30, 2010

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im willing to bet that you had a coil pack fail on you. they are one of the most common failures on the 1.8t engine. another thing i would check is for any boost hoses that may have popped off if you were accelerating quickly.


but before you go and buy a new coil pack. unplug your maf sensor and see if it runs any better than before. if the problem goes away when you unplug you maf then the mass air flow sensor is bad. but if its the same then you have a bad coil pack.

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