Can anybody tell me how to change fuel injectors on 1989 audi 200 quattro?

Sounds like engine coolant sensor is at falt. If it thinks the weather is below O let's say. It will tell the computer that info and the computer will make the injectors poor the fuel to keep the engine running in the first start up but after the engine is warm and the coolant season doesn't tell the computer any different it will continue to poor the fuel in and will flood the engine. Get them Checked

A broken valve, a bad spark plug wires, or spark plug wires loose.

first thing to do is check the basics 1 air leaks ie, vacuum hoses 2nd clean the throttle butterfly/housing 3rd the engine coolant temp sensor in the cyl head/ thermostat housing if thats gone out of spec it will not fuel the engine correctly

CODE P1300 IS MISFIRE DETECTED FUEL PROBLEM. WHICH MEAN 3 FUEL INJECTOR IS CLOGGED UP.HAVE FUEL INJECTORS CLEAN AND CHANGE FUEL FILTER.

1989?? have a funny feeling it could be either crank sensor or the ignition module ,pretty basic vehicle electrics in them days

did you plug in the fuel pump at the fuel pump. did you cycle the key off and on at least 5 times check the plug at the fuel pump first to see if its still plugged in

These are hitachi injectors and are horribly engineered..Replace them with modern bosch injectors:
http://www.034motorsport.com/product_info.php?cPath=24&products_id=329

Just a silly question...how much driving do you do that is at 10mph? Most times this is less than 5%...so if everything else is fine why be concerned? As far as the why of it, you could have a slight vacuum leak or any number of sensors that are very slightly out of range, not enough to cause a problem, but enough to change mileage expectations. The addition of ethanol to our fuel has also impacted fuel mileage...The dirty little secret about any alcohol fuel is that nearly twice the amount of alcohol is necessary in order to produce the same energy output of gasoline...which will definitely lower mileage. Some power can be "recovered" by increasing compression ratios and changing engine timing (advance)...However today's vehicles are calibrated and built to burn gasoline and cannot without, major mods, be made to use anything but. Alternative fueled vehicles make a compromise in these areas but a compromise is just that.

Check the fuel filter, you may have clogged it when you filled the tank.

Hello, I used to own a 1989 audi 200 turbo. These cars have a rather complicated fuel injection system called constant injection system (CIS 2). They can be difficult for most mechanics to figure out, unless they are already familiar with it. If you do bring it to a mechanic, try to find one that is familiar with these cars. And don't be afraid to get a second opinion. I had one mechanic claim that my car needed several thousand dollars worth of parts, another was able to fix it for under a hundred. The only suggestion I have is that it sounds like it is vacuum related. Good luck!