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Anonymous Posted on Jun 10, 2017
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2003 Passat 4 Cylinder 1.8L Turbo wagon: misfire codes for all cylinders

Got an engine light. Engine sounded a little rough during idle but nothing serious. Had codes read at Advance Auto. Showed all cylinders misfiring. I replaced all spark plugs with proper gap. Also bought a new coil pack and put it in all four positions without any change in performance. Absolutely nothing changed after all this. Engine light still on. Still a little rough at idle and seems to be a little less powerful when accelerating. What should I try next?

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Bill George

Bill George

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  • Volkswagen Master 2,517 Answers
  • Posted on Jun 10, 2017
Bill George
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Compression check may tell you something.

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Anonymous

  • 65 Answers
  • Posted on May 21, 2009

SOURCE: Firefire in cylinder four / random misfires

Its not likley to be an injector fault.the air mass meter is far more common.if you unplug it it defaults to a average value and should improve the way it runs if that is the problem.

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Anonymous

  • 167 Answers
  • Posted on Jul 03, 2009

SOURCE: 2000 passat ATQ, normally aspirated. Misfire #5.

Swap #5 injector with another one and see if the miss moves .
If the miss moves then the injector is faulty.
If the miss doesn't move do a compression test and get back to me .
Cheers
George

Michael Stephens

  • 119 Answers
  • Posted on Jul 23, 2009

SOURCE: MISFIRING ON CYLINDER 1 VW POLO 1.4 3CYLINDER

I have changed a few cylinder heads under warranty for this type of problem. The exhaust valve guides wear, this causes the exhaust valve to seat badly, giving low compression. if one cylinder compresion reading is more than about 50 psi below the others, then this warrants head removal. It is quite a job, due to the fact that the camshft id chain driven. If you are up for it then once the head is removed, poor liquid into the exhaust ports and see if it leaks out through any of the exhaust valves.

alicantecoli

Colin Stickland

  • 22516 Answers
  • Posted on Dec 12, 2010

SOURCE: 1997 Jetta GLX VR6 giving

pull the multi plug connectors off the coil pack and check the connections ,and then rub the pins with a soft lead pencil and see what happens

Anonymous

  • 4803 Answers
  • Posted on Feb 27, 2011

SOURCE: 1999 VW Passat 1.8 turbo Code #3 cylinder misfire.

Coils and plugs are not the only things that can cause misfires. Misfires can be caused by vacuum leaks, low compression, faulty fuel injectors, clogged EGR ports (on vehicles with individual ports for each cylinder), blown head gaskets, burned valves...you can spend a LOT of money on parts by just going in and replacing things without diagnosing WHY the cylinder is misfiring.

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