Question about 2002 Audi A4

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I have misfires in cylinders 1,2 and 4 on my 1999 audi a4 1.8t, it idles fine and easy accel is fine but once i try for heavy acceleration it spits and sputters

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  • 86ZTurb Jun 16, 2009

    i have new plugs but i will check the fuel problem thanks

  • 86ZTurb Jun 17, 2009

    the car revs up fine when in park or neutral do you still think this is fuel problem??

  • 86ZTurb Jun 18, 2009

    do you think all 3 coils went bad at the same time??



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Have fuel injector clean + change fuel filter.also change plugs and wires every 30000 miles .if it been a while change them.

Posted on Jun 16, 2009

  • Jonah Oneal Jun 18, 2009

    dirty injectors can cause cylinder misfires.bad coils also.

  • Jonah Oneal Jun 18, 2009

    its rare all three coils are bad.the same time.what i would do buy one good coil place in coil 1 2 4 spot and do one coil at a time to see if new coil fires in that spot.make sure you are using the right spark plugs it should be NGK BKUR6ET.SPARK PLUG GAP SHOULD BE 0.032.if all is good .injectors 1 2 4 .is dirty or almost stop up.or you have a in take leak.



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you are not supposed to adjust the idle, ever. that is the ECUs job.
adjusting it , now, means you have lied to the ECU.
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nice guess though, very carb like guess. Is common idea... sure...
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this can fail easy , if any EFI engine misfires.
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lets use 1 example , 1 cylinder is dead, the ISC can NOT fix that. nor idle right.
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but i get ahead of myself......

Did you do the 60,000 mile full tune up as listed in the oper guide?
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tune it up. if still misfire. we diagnose that 2nd, and fix it.

there are tests for each step. I can show you them, all of them.

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here is a great list. and is not complete. !!!

one common cause is a leaky EGR main valve
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