1991 Audi 100 Avant emission

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Condition	Value

expand_moreDiesel exhaust gas values

expand_moreMaximum K-value


All other modifications	2.5 1/m2.5 1/m2.5 1/m

expand_moreGeneral exhaust gas values

expand_moreIdling speed with automatic gearbox

expand_moreAll other modifications

expand_moreDS engine


With regulated catalytic converter	825–975 rpm825–975 rpm825–975 rpm
Unregulated catalytic converter	700–800 rpm700–800 rpm700–800 rpm
Without catalytic converter	700–800 rpm700–800 rpm700–800 rpm


JW engine	800–900 rpm800–900 rpm800–900 rpm

expand_moreNP engine


With regulated catalytic converter	825–975 rpm825–975 rpm825–975 rpm
Without catalytic converter	700–800 rpm700–800 rpm700–800 rpm

expand_moreIdling speed with manual gearbox


All other modifications	700–800 rpm700–800 rpm700–800 rpm


Minimum engine oil temperature at VET	176°F176°F80°C

expand_morePetrol exhaust gas values

expand_moreCO content at idling speed

expand_moreAll other modifications

expand_moreDS engine


With regulated catalytic converter	0–0.5 %0–0.5 %0–0.5 %
Unregulated catalytic converter	0.01–1.01 %0.01–1.01 %0.01–1.01 %
Without catalytic converter	0.5–1.5 %0.5–1.5 %0.5–1.5 %


JW engine	0.5–1.5 %0.5–1.5 %0.5–1.5 %

expand_moreNP engine


With regulated catalytic converter	0–0.5 %0–0.5 %0–0.5 %
Without catalytic converter	0.5–1.5 %0.5–1.5 %0.5–1.5 %


Delta lambda	0.03 λ0.03 λ0.03 λ

expand_moreIgnition time


All other modifications	-18°00'±1°00' - before TDC + after TDC


Increased idling speed	2500–2800 rpm2500–2800 rpm2500–2800 rpm
Lambda value	0.97–1.03 λ0.97–1.03 λ0.97–1.03 λ

expand_moreMaximum HC content at idling


All other modifications	350 ppm350 ppm350 ppm


Petrol conditioning speed	2500 rpm2500 rpm2500 rpm
Petrol conditioning time	120 s120 s120 s

expand_moreSpeed for disturbance variable

expand_moreDS engine


With regulated catalytic converter	725–1025 rpm725–1025 rpm725–1025 rpm

expand_moreNP engine


With regulated catalytic converter	725–1075 rpm725–1075 rpm725–1075 rpm

To reduce environment impact and pass government inspections keep emission parameters at the level prescribed by Audi.

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 1991 Audi 100 Avant user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.

Before doing any DIY service please check your insurance policy and Audi warranty policy for your region. In some regions DIY service may invalidate your warranty.

Conquer your fears and never give up!

DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Audi 100 Avant service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.

Doing basic service for your 1991 Audi 100 Avant you're not only saving money, but also also improving your technical skills and learning something new.

1991 Audi 100 Avant generations

In 1991 Audi offered 2 generations of the 100 Avant. Emission may vary in different generations. Be sure that you are looking at the rigt modification.

C4

Type 4A

1991 Audi 100 Avant C3 facelift Emission

Table of Contents

Conquer your fears and never give up!

1991 Audi 100 Avant generations

C4

Audi 100 Avant C3 facelift model years

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