Audi put the ecm under the rug, were it is impossible to access! You will need to have a dealer parts department look up your ecm number from your VIN number, or use VAG-COM to get it. However, if you had VAG-COM, then you might find it wasn't the ecm! There are hidden screws under the door sill and on the floorwell cover. You will probably need the Bentley CD manual and the VAG-COM to install the ecm, inside the electronic control box.
This may take a very long time, as you may buy the wrong ecm or something else will break. The ecm number is onits cover. How will you know which box is the ecm? There is also another box in the electronic control box. The electronic control box has a two piece cover held by two screws. One of these screws is under the carpet, were a 1/4 inch socket wrench won't fit. Only a ratchet wrench will sometimes work. It depends on the shape and size of the wrench.
Loosely wound connections will cause trouble. You should use crimped connectors with watertight insulation.
How much did the car cost? You need to find somebody near by with VAG-COM, so they can show you how you need it for an Audi, as you also need the repair manual.
Also, you have an AFC engine, not an AAN. The Mustang is Ford. The Rodeo is Isuzu. Each company has different systems. Different Audi's have different ecms.
I am somewhere in Missouri, werever that is. It was in the 70s today again. Maybe it will change its mind and move again to somewhere colder with a foot of snow. What do you use an Audi for in Florida?Now anamphibious Audi would be perfect, so you could go to an island. Of course it would spend most of its time broken with salt water in its ecm.

 

well the car was 3000, and ive put in a new stereo with subs and kenwood speakers then 18" wheels and now the performance upgrades.. i realize the ford and isuzu are different operating systems but the situation is the same and i would think the outcome would be similar?? with same symptoms and everything i would assume it would be similar and then the fact that the mass air flow sensor goes into the ecm and if the wires shorted out i could have eaily burned something out in it.. im not really worried about getting to the ecm, i realize its alot of work, but i dont think i will have a problem doing it.. i took all that apart when i installed my new radio anyway, i didnt really need too but i did anyway lol. I just didnt know the electronic control box was there.. this is the first problem ive had with the audi and it was at my own fault.. ill do a bit more research but i believe that the ecm is the problem here..

 

The resistance of the ignition coils is measured to determine whether or not the coil windings are within specification. You need a digital ohm meter. This may also be done on each sparkplug wire. Most digital volt meters are also ohm meters. Weak coils and sparkplug wire will be usually out of specification. Also, these components are easy to test on the 2.8L AFC engine. You can also test the wiring with the ohm meter by putting a probe at each end of the wire. Radio Shack has a lot of items that help connecting the ohm meter probes to a small needle inthe end of the ecm cable terminal, A12, for the MAF green wire. The brown red MAF wire should ground to the engine. The black green wire goes to diagram location 39 on the wiring diagram. The symbol is a rectangle with the number 39 inside, connected to the black green wire. so, the black green wire goes to a fuse, S103, which is 15amp, which connects to the main terminal 15. The main terminal is located below the steering wheel, and has studs with nuts. So, you need to locate this fuse, S103.

 

well i was out messing around before i got that last message and i got to the ecm in about 15 minutes.. (i didnt see what was so hard?? it was like 4 screws total and a little wiggling and pulling, i discovered 4 fuses there and low and behold there was a 15 amp one that was fried, i put in a new fuse and wamm it starts up... i let it idle for aobut 15-20 minutes and it idled fine with no rough idling or anything then i took it out for a spin with the intake on it.. man did that k&n make a difference..

So i give a great thanks to all of you for all your time and effort.. and it seems a6hcw nailed it at the end there.. i just happened to find that fuse before i saw his message..

you have no idea how happy i am right now lol.. no costs to me other than the little fuse which i have a bunch of those in my garage anyway so im very satisfied.. took it out for a spin and is running great..

i cant believe that i didnt hear of those fuses until i saw them.. youd think theyd be online or in the manual or something??? but whatever im just happy it all worked out..

Thanks again

Sean

 

The 15amp fuse, S103, is for the three ignition coils and the MAF sensor, per the wiring diagram. This fuse may be in the electronic control box under the rug, or hidden somewere else. I had the same problem locating the hidden 60amp fuse for the radiator fans, on a 1996 A6. There are four fuses hidden in the electronic control box under the rug. These omissions in the Bentley CD and the owners manual of the physical location of certain fuses is interesting, as fuses sometimes fail.

 

yeah, i couldnt believe there were 4 fuses down there.. especially ones as vital as that..Oh well.. im just glad i found them..

thanks

 

The ecm is connected to the black green wire and fuse S103, so that is why the VAG-COM could not communicate with the ecm. Also, the ecm is coded using a VAG-COM, per the Bentley CD.The "Function Chart" on the ross-tech.com web site lists the differences between the shareware and the full registered version. The ballon with coding chart data will only appear on the coding screen, if the VAG-COM is registered and actvated. Click on the underlined "YES". Also, without the Bentley CD,it will be difficult to use the VAG-COM without making a few errors. You can get the CD at www.themotorbookstore.comor from www.bentleypublishers.com.

 

yes... we've all had our fair share of crabs havent we...[:@]

 

haha had to get that last comment in there.. this has been a great thread..

 

Knowing about the fuses made itworth it --

Talking about the crabs made it interesting ---


The other parts were questionable ---