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    Audi A4 1.8t 2003 BFB Archived Message

    Posted by Jeff Perrin on May 30, 2008, 11:17 am

    Got a serious misfire, to the extent that the cat starts to glow after approx 5 mins. Codes that come up are multiple misfires. The live data that we can pull up is fairly sparce on either launch or ID. The vehicle has had 4 plugs and 4 coils (genuine). Injection duration across the board at tickover is 4ms give or take. The compressions are approx 160psi across all 4 cylinders. No signs of any air leak. Emissions - lambda running high at 1.2. Cat is still intact (viewed through lambda sensor hole)will not even fire with lambda probe removed. Makes no difference if exhaust removed and checked intakes therefore engine can breath ok. Fuel pressure at rail is within spec.
    Checked valve timing on belt as well as the variable timing on the chain.Coolant temp switch seems to be doing as it should.
    Please help as i am losing the will to live over this one.

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