Results 1 to 9 of 9
Discuss Getting an old Audi to pass emissions inspection in the alt.autos.audi forum at Car Dealer Forums; My trusty 89 Audi 100 failed the Texas annual emissions inspection, with excessive HC at ...
  1. #1
    Stephen Clark
    Guest

    Default Getting an old Audi to pass emissions inspection

    My trusty 89 Audi 100 failed the Texas annual emissions inspection, with
    excessive HC at idle ( 373 vs. the 220 limit ). All other parameters were
    under the limit, including HC at speed. The inspection station said to get
    an additive from O'Reilly Auto Parts called "Guaranteed To Pass", and run it
    through a tank full of premium gas with Techron. Then run the car for about
    15 miles to get it good and warm before inspecting it again.

    I have 15 days to get the car re-inspected without having to pay another $40
    fee.

    What do you think of their advice? Do you have any other suggestions?

    FYI, the car has been maintained by the book by a very competent Audi
    mechanic, and it is current on oil changes and tune-ups; all the basics are
    correct. I also add Techron at every oil change. He says it may need a new
    catalytic converter. The odometer stopped working several years ago, but I
    estimate the mileage at around 300K miles. I only put about 4000 miles a
    year on the car now, so it is driven mostly in town two or three times a
    week for short trips.

    Thanks for your opinions!


    --
    Stephen Clark
    89 Audi 100
    Houston, Texas USA





    › See More: Getting an old Audi to pass emissions inspection

  2. #2
    TonyJ
    Guest

    Default Re: Getting an old Audi to pass emissions inspection



    Stephen Clark wrote:
    > My trusty 89 Audi 100 failed the Texas annual emissions inspection, with
    > excessive HC at idle ( 373 vs. the 220 limit ). All other parameters were
    > under the limit, including HC at speed. The inspection station said to get
    > an additive from O'Reilly Auto Parts called "Guaranteed To Pass", and run it
    > through a tank full of premium gas with Techron. Then run the car for about
    > 15 miles to get it good and warm before inspecting it again.
    >
    > I have 15 days to get the car re-inspected without having to pay another $40
    > fee.
    >
    > What do you think of their advice? Do you have any other suggestions?
    >
    > FYI, the car has been maintained by the book by a very competent Audi
    > mechanic, and it is current on oil changes and tune-ups; all the basics are
    > correct. I also add Techron at every oil change. He says it may need a new
    > catalytic converter. The odometer stopped working several years ago, but I
    > estimate the mileage at around 300K miles. I only put about 4000 miles a
    > year on the car now, so it is driven mostly in town two or three times a
    > week for short trips.
    >
    > Thanks for your opinions!
    >
    >
    >

    The four T44s that I used to have never had a problem with inspections.

    Try to replace you air filter.

    Your mechanic probably is familiar with the ISV Idle stabilization valve
    and the throttle body switch that activates its controller. You might
    want to have its function checked.

    If yours has an O2 sensor, that might need replacing.

    There is also an adjustment for injector frequency (I don't remember
    what it is called) that can adjust rich / lean conditions. Your mechanic
    could look at adjusting that with a dwell meter.

    The first thing I would do is to try the suggestion of the inspectors
    with the "Guaranteed To Pass" and the Techron. It might just be dirty
    injectors.

    Let us know how it tests.

  3. #3
    dave AKA vwdoc1
    Guest

    Default Re: Getting an old Audi to pass emissions inspection

    distributor too far advanced
    bad spark, spark plug or injector
    air/vacuum leak maybe at injector seals
    debris on intake valves soaking up fuel before it enters the cylinders
    mixture too lean (CO adjustment in fuel distributor)

    engine problems?
    TonyJ mentioned the throttle switches which might have broken wires.
    I think your fuel injection has the electronic fuel pressure regulator which
    can be adjusted with a Digitasl Volt Ohm Meter.

    So new air & fuel filters, spark plugs & wires, oil change would be the
    second thing to do after a compression test. ;-)
    but these things have been done! ;-)
    --
    later,
    dave
    (One out of many daves)

    "TonyJ" <"tonyjnospam at nospam visi.com"> wrote in message
    news:XtadnZrlue7AnGnanZ2dnUVZ_oOnnZ2d@visi...
    >
    >
    > Stephen Clark wrote:
    >> My trusty 89 Audi 100 failed the Texas annual emissions inspection, with
    >> excessive HC at idle ( 373 vs. the 220 limit ). All other parameters were
    >> under the limit, including HC at speed. The inspection station said to
    >> get an additive from O'Reilly Auto Parts called "Guaranteed To Pass", and
    >> run it through a tank full of premium gas with Techron. Then run the car
    >> for about 15 miles to get it good and warm before inspecting it again.
    >>
    >> I have 15 days to get the car re-inspected without having to pay another
    >> $40 fee.
    >>
    >> What do you think of their advice? Do you have any other suggestions?
    >>
    >> FYI, the car has been maintained by the book by a very competent Audi
    >> mechanic, and it is current on oil changes and tune-ups; all the basics
    >> are correct. I also add Techron at every oil change. He says it may need
    >> a new catalytic converter. The odometer stopped working several years
    >> ago, but I estimate the mileage at around 300K miles. I only put about
    >> 4000 miles a year on the car now, so it is driven mostly in town two or
    >> three times a week for short trips.
    >>
    >> Thanks for your opinions!
    >>
    >>
    >>

    > The four T44s that I used to have never had a problem with inspections.
    >
    > Try to replace you air filter.
    >
    > Your mechanic probably is familiar with the ISV Idle stabilization valve
    > and the throttle body switch that activates its controller. You might want
    > to have its function checked.
    >
    > If yours has an O2 sensor, that might need replacing.
    >
    > There is also an adjustment for injector frequency (I don't remember what
    > it is called) that can adjust rich / lean conditions. Your mechanic could
    > look at adjusting that with a dwell meter.
    >
    > The first thing I would do is to try the suggestion of the inspectors with
    > the "Guaranteed To Pass" and the Techron. It might just be dirty
    > injectors.
    >
    > Let us know how it tests.




  4. #4
    Stephen Clark
    Guest

    Default Re: Getting an old Audi to pass emissions inspection

    Thank you all for your suggestions. After running the gas treatment through
    a full tank of premium, the HC at idle was reduced by about 100 points to
    285. The limit is 220, however. My mechanic says to run another can through
    and see if it will get it under the limit. Is this a good idea? Are the
    effects of the intake system cleaner cumulative?


    --
    Stephen Clark
    89 Audi 100
    Houston, Texas USA




  5. #5
    dave AKA vwdoc1
    Guest

    Default Re: Getting an old Audi to pass emissions inspection

    It sounds like you are on the right path.
    Can the distributor timing be retarded a little on your engine?
    Can you give it a nice long run on the highway with the cleaner in it?

    "Stephen Clark" <noone@nothing.not> wrote in message
    news:_-OdnY7K7pXQMGfanZ2dnUVZ_judnZ2d@oplink...
    > Thank you all for your suggestions. After running the gas treatment
    > through a full tank of premium, the HC at idle was reduced by about 100
    > points to 285. The limit is 220, however. My mechanic says to run another
    > can through and see if it will get it under the limit. Is this a good
    > idea? Are the effects of the intake system cleaner cumulative?
    >
    >
    > --
    > Stephen Clark
    > 89 Audi 100
    > Houston, Texas USA
    >
    >
    >




  6. #6
    Stephen Clark
    Guest

    Default Re: Getting an old Audi to pass emissions inspection

    I did just exactly that on the first go-round. Ran it on a weekend trip, and
    even performed
    the old "Italian tune-up" - running it in second gear at about 5000 RPM for
    a few brief bursts.

    I don't know about retarding the timing - isn't it controlled by the
    computer via knock sensors?


    --
    Stephen Clark
    89 Audi 100
    Houston, Texas USA



  7. #7
    TonyJ
    Guest

    Default Re: Getting an old Audi to pass emissions inspection



    Stephen Clark wrote:
    > I did just exactly that on the first go-round. Ran it on a weekend trip, and
    > even performed
    > the old "Italian tune-up" - running it in second gear at about 5000 RPM for
    > a few brief bursts.
    >
    > I don't know about retarding the timing - isn't it controlled by the
    > computer via knock sensors?
    >


    It is limited by the knock sensors but I thing you have some control in
    adjustment with the distributor. If the distributor adjustment bolt is
    still covered by the factory tamper shield you would need to use a hand
    grinder to take that off before adjusting. Mark the distributor location
    before changing it.

  8. #8
    dave AKA vwdoc1
    Guest

    Default Re: Getting an old Audi to pass emissions inspection

    So on your '89 your ign spark is timed using an Engine Speed Sensor and not
    the distributor?
    The only 100 I have seen needed a new Crank Sprocket.

    "Stephen Clark" <noone@nothing.not> wrote in message
    news:ft-dnWkY56DEI2banZ2dnUVZ_hWdnZ2d@oplink...
    >I did just exactly that on the first go-round. Ran it on a weekend trip,
    >and even performed
    > the old "Italian tune-up" - running it in second gear at about 5000 RPM
    > for a few brief bursts.
    >
    > I don't know about retarding the timing - isn't it controlled by the
    > computer via knock sensors?
    >
    >
    > --
    > Stephen Clark
    > 89 Audi 100
    > Houston, Texas USA
    >




  9. #9
    Stephen Clark
    Guest

    Default Re: Getting an old Audi to pass emissions inspection

    I know it has knock sensors, but I don't know about an engine speed sensor.
    Seems like there is a Hall effect sensor, but I don't know if that is
    involved in timing or not.

    I didn't think that the timing was adjustable at the distributor, but
    according to Tony J it is adjustable at the distributor, if you defeat the
    tamper shield. Haven't looked at it yet to see, though.

    Stephen Clark
    89 Audi 100
    Houston, Texas USA


    "dave AKA vwdoc1" <vwdoc1nospam@pleasehotmail.com> wrote in message
    news:TC7Mj.2537$h75.1774@newssvr27.news.prodigy.ne t...
    > So on your '89 your ign spark is timed using an Engine Speed Sensor and
    > not the distributor?
    > The only 100 I have seen needed a new Crank Sprocket.
    >
    > "Stephen Clark" <noone@nothing.not> wrote in message
    > news:ft-dnWkY56DEI2banZ2dnUVZ_hWdnZ2d@oplink...
    >>I did just exactly that on the first go-round. Ran it on a weekend trip,
    >>and even performed
    >> the old "Italian tune-up" - running it in second gear at about 5000 RPM
    >> for a few brief bursts.
    >>
    >> I don't know about retarding the timing - isn't it controlled by the
    >> computer via knock sensors?
    >>
    >>
    >> --
    >> Stephen Clark
    >> 89 Audi 100
    >> Houston, Texas USA
    >>

    >
    >




Similar Threads

  1. Replies: 0
    Last Post: 03-23-2011, 09:24 PM
  2. Failed NJ Inspection for Emissions
    By BluJeanBaby1130 in forum alt.autos.dodge
    Replies: 2
    Last Post: 02-04-2007, 05:33 PM
  3. Failed HC ppm and CO % emissions Inspection
    By Dave in forum alt.autos.gm
    Replies: 0
    Last Post: 10-05-2006, 01:45 PM
  4. Need to pass inspection Help with 2000 camry CEL.
    By Btmorris82@comcast.net in forum alt.autos.toyota
    Replies: 23
    Last Post: 09-11-2006, 11:39 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •