Question about 1992 Audi 100

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'92 Audi 100 CS turning over but not starting

My '92 Audi 100 CS just started having issues when starting. It will turn over but not fire. This has happened 3 times now. The first time I tried to start it 3 times, waited 30 seconds and tried again and the car started. About a week later the same thing happened. I tried waiting like I did before but this did not work. I waited about 30 minutes this time and it started. I drove about 9 miles and turned it off. When I tried to start it again it wouldn't work. When I came out in the morning (about 8 hours later) it started just fine. I don't know what's wrong and don't enjoy driving a vehicle that may or may not start. I just had the starter and ignition switch replaced 18 months ago and the fuel pump was replaced two years ago. Also, the car makes a clicking sound when it's on. Could this have anything to do with the vehicle not starting? It's always done that but seems to be quieter right after the oil is changed.

Any help would be great!!!

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You have a bad camshaft sensor. It's located at the back of the driver side valve cover. Takes 20 minutes to replace. I had exact problem and this solved it.

Posted on Jul 31, 2009

  • HARINDER SINGH Sep 27, 2011

    I ve a similar problem with Audi 11, year 1991.

    It used to NOT start when cold but even 2 hrs after parking on a warm day it will restart. But after a full day not starting, even on a warm day it will not start..

    The ignition and sparks to the plugs are excellent but seems no fuel into the cylinders by the injectors....as I removed a plug after several crankings....but no fuel....nor any smell of unburned fuel at the tal pipe.
    But now it won't start period. Cleaned the air mass flow meter from inside and also the intake manifold area where the flaps open for acceleration control. But npo response.

    Again its the fuel not going into cylinders.

    Have checked the pressure at the outlet of Fuel filter...its plenty...and also every time you turn the ignition on ....you can hear the fuel pump...priming and then stopping.


    Any sugeestions...??
    .will appreceiate !!

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You're probably facing 'fuel pressure problem'. Your fuel pressure regulator doesn't hold pressure. FYI, it is located at the fuel distrbutor, has a cylindrical shape. There's a return valve that send back excess fuel to the fuel tank. A faulty FPR will cause this problem.

Do check it out.

Posted on Oct 10, 2008

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Had exactly same problem ,seems to be coil cos when I changed it, so far so good starts like a dream.I was thinking same as the other answers,so was surprised but there you go simple!

Posted on Aug 04, 2009

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