Question about 1993 Audi 100

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My Audi 500 SEL 1993 model is difficult to start - as if there is not enough fuel injected when the engine is cranked. Agents tell me that the injectors are leaking and needs replacement. I don't agree with this, because at times the engine would start with the first turn of the switch. If injectors leak, they should surely leak continuously?

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Bad fuel, bad fuel pump, clogged fuel fiter, injectors or fuel fiter. If injectors are leaking at o-rings on rail or cylinder head your sucking in air and changing mixture ratio, computer can't compensate. Try all these things before proceding further... also when cold thew seals may be holding but when warmed up this is can be a very dangerous fire condition!

Posted on Sep 16, 2010

  • ewaldh Sep 16, 2010

    Thanks for quick response!
    Bad fuel: could be but I have no way of checking the quality;
    Bad fuel pump: Recently replaced
    Clogged fuel filter: Recently replaced
    Injectors o-rings: Is it possible to change these o-rings before spending a lot of money on the injector replacements?
    Much obliged.

  • Michael Kent
    Michael Kent Sep 16, 2010

    explain to me exactly where the injectors are leaking... top o-ring at fuel rail, bottom o-ring at head, or the injector itself. I use synthetic steel wool to clean surface of seating ports (being careful of dust generated), wipe with gasoline on clean soft rag, important to lubricate o-rings and seat surface with automatic trans fluid and use twisting motion to install to prevent pinching or abrasion of o-ring. They should be available separately from good parts shop...



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