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@[EMAIL PROTECTED]
>
>
> 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.
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