Question about 1990 Audi Quattro

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91Audi V8 my car idles at 1500 when I first start it and then if I rev it up it holds at 2000 to 2500. It would be great if someone could give me some ideas. The car is charging at 17 some volts also could that be the problem thanks Troy

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  • tclose320 Jul 10, 2008

    Right now i have a extra spring on the linkage. because I had thought something like you said but the didn't seem to make a difference. Any other possibility

  • tclose320 Jul 28, 2008

    Ok I had the alternator fixed. It was the regulator. So during this process I cannot seem to get the belt back on. I tried the same t40 that I used to get it off but now all it is doing is losening the bolt. Any ideas would be greatly appreciated

  • tclose320 Jul 28, 2008

    Got the alternator belt on! So I do not need any info on that but, I lokked farther into my high idle problem and it seems that the linkage is hanging up, Does that go all the way through the plenum. Is there a quick fix or do I have to replace it all? Any info would help. Thanks

  • tclose320 Jul 28, 2008

    Alright, I dug father and it seems that the thottle cable is pulled apart at the firewall i can see the sping and it looks like whatever contraption is in there is not right. What is the easiest way to replace this other than taking it somewhere?



2 Answers

Ok. I had the alternator fixed, it was the regultor. So during this process I cannot seem to get the belt back on. I tried the same t40 that i used to get it off but now all i am doing is losening the bolt. Any ideas would be greatly appreciated.

Posted on Jul 25, 2008

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It sounds as if you have two problems, not related.

- The high idle sounds like a restriction of the cable to the fuel system from the accelerator.
Check under the hood while it is misbehaving and locate where the cable terminates (throttle body I suspect) and tap movable parts there with a finger to see if you can influence the idle.
You may just need a little judiciously applied lubrication in the right place although I had a car years ago that had a sheathed accelerator cable that ate into the soft plastic liner and would eventually hang, necessitating jabbing the gas pedal to break it loose. I replaced the lousy cable with a couple of pullies to guide an open woven steel wire around corners.

The 17 volts is either because of a failed regulator (fix this before it eats 'stuff' in your electrical system) or a battery that is nearing the end of its life.
The crummy modern battery builds internal resistance until it no longer charges from the car's alternator.
Even if that is the case, the terminal voltage should never be allowed to rise that high by the regulator.
Typically, anything beyond 14.3-14.4 will shorten the life of your battery and cook the water out of the acid-water solution.

Posted on Jul 09, 2008

  • Steve Allison
    Steve Allison Jul 10, 2008

    But have you tried at the last movable part at the throttle body?

    Or, you could detach the cable under the hood and operate the mechanism to which it is normally attached by hand.

    It still sounds like a problem of binding of a shaft or cable.

    Also, since the car is new enough to have some kind of electronic engine controls ('computer') it is possible that your high voltage situation has damaged the computer in some way.

    For automotive systems such as entertainment stuff, it is normal to find components called 'capacitors' of a certain type (electrolytic) to have ratings of 16 VDC, below what you found the system to be producing. Because these things in particular are often such cheap pieces of ****, they don't tolerate overvoltage very well.

    The next common voltage rating is 25 VDC and these cost a penny or two more so aren't very much used for 12 volt systems.

    I don't know what kind of diagnostic provisions Audi used then but it might be worthwhile for you to procure an aftermarket service manual such as those from Haynes or Chilton that you will find in all of the chain parts stores.

    Let me know how you do -

  • Steve Allison
    Steve Allison Jul 30, 2008

    Sorry it took days to get back but my 3.5 yr old system finally ate its Windows installation and I could not get on line without doing a complete restore on it.

    Now and then, I get 'lucky' so was glad to read that the two problems were not related.

    The 'spring' you see may well be a spiral channel in which the actual cable runs and it sounds as if it is pulled apart making a replacement necessary.

    I'm not familiar with your car so the degree of difficulty is not known to me.

    Personally, I have replaced a couple and most were not that tough but if I was doing your car, I wouldn't start without buying a Haynes or Chilton service manual for it.

    Good luck; glad to read that you are making progress-



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