Hello everyone
I have a 1999 audi a4 1.8t quatro, and today the check engine light started to blink and the car started to shake when in park and also while driving, I went to a mechanic I know and had the car scanned and it says the 2nd cylinder is misfiring, I hadnt had the spark plugs changed in a while so I changed all 4 spark plugs, the code still read the 2nd was misfiring, so I swaped the coilpacks around and it still said the second was misfiring, I had the fuel injectors checked and there still in good condition, The mechanic checked to see if there is a vacuum leak and he couldnt find any, any sugestions

 

I believe the '99 model year and earlier have an ignition control module located near the airbox. This is most likely your problem.

 

Check this out.

http://forums.audiworld.com/showthread.php?p=1535031

 

Classic ICM.

Nice find on the write-up, bkraska.

 

Thanks allot, ill try the test tommorow and post the results

 

Checked the ICM and it is the culprit, i had one quick question though, how long can i drive the car whith ICM malfunctioning, I know its going to cause damage but I wont have the funds to buy the ICM until Weds and its my main source of transport for school and work, I only drive about 20 to 30 miles when im working or have school

 

dude if your cars miss fireing DONT DRIVE IT try and find some buddys to give you a ride untill you fix it well that is unless you want a **** load of more problems

 

You'll need a lot more funds to fix it when you fry the cat from misfires. Park it until you fix it.

 

thanks allot for all the posts I parked the car and didn't drive it until i got the part today and put it in, But a new problem has started, when im on the highway and use the turbo, the car will shake for a second before returning to normal, i dont have this problem when on the streets and using the turbo, it knoy happens on the highway, thr car normal and everything except when the turbo is engaged, any ideas

 

The check engine light was on and I went to a friend a and had them read it, there were at least 8 different codes from multiple misfirings of the 2nd and 3rd cylinder, air vac leak and some others, when changed the ICM and the other parts I forget to clear all the fault codes, so I had my friend clear them out and the engine light was gone, after that I drove on the highway to test it out and everything performed the way it should including the turbo, this worked out for the majority of the day until when i was driving on the street the check engine light came on again, I wasnt engaging the turbo or anything like that just driving 30 miles, so when the engine light came on again I decided to go on the highway and make sure the problem wasnt the turbo, but when engaged the turbo on the highway the same problem i had prevously occured again, the car would shake for a second and then the turbo would engage, the other thing i noticed is the check enigine light would blink when the turbo is fully engaged, I think it has something to do with the wiring becouse of the car performing normally after clearing the fault codes another reason that makes think it is wiring is becouce some time during the day after clearing the codes, the red oil light camr on when started the car but went away after blinking 2 times, I checked to see if there was any leaks and there were any