CeffyMike Posted December 29, 2010 Report Share Posted December 29, 2010 Hi guys and gals New to the site as i just purchased my A8 today and sadly my first post is in the form of technical help. I know nothing about Audi's unfortunatly as im a jap man at heart. So basically i purchased a 1999 4.2 quattro sport, 129k on the clock. Lots of history, euthsiast owner ( think its nikw on here hell of a nice guy, talked me threw all the things i needed to look out for and stuff) took for a test drive, everything was fine, car went well, everything worked apart from the spare key but thats no issue tbh. Paid money etc etc and went on my way a very happy man Driving for about 25 mins and came to a cross roads and the car stalled, just died as i came to a stop ( was in tip tronic mode and not auto if that makes any difference). Restarted and everything was fine apart from the speedo and mileage counter wouldnt work along with the trip. Everything else works fine and the speedo is illuminated but just doesnt work, also the cruise controll doesnt work now which i suspect is down to the speedo no working. This all worked in the test drive and was fine up until it stalled. I tried restarting and also turning off and waiting 10 mins but no difference.Not sure if the stalling is just a coincidence but its strange how it was fine up until then. Called Nik to see if this has happened before or is a common issue and any tips but he said he hasnt had any past problems with it which i have no reason to doubt him as he is a very nice guy. Anyone have any tips or ideas on what i should look for or try ? im fairly capable with DIY fixes but i wouldnt know where to begin on one of these ? Is the speedo drivenf rom the box or is it electronic ? many thanks in advance for your help Link to comment Share on other sites More sharing options...
CeffyMike Posted December 30, 2010 Author Report Share Posted December 30, 2010 forgot to add that did the check and nothing came up with any errors and also only one of the two mpg things work now. Link to comment Share on other sites More sharing options...
ainarssems Posted December 30, 2010 Report Share Posted December 30, 2010 The problem is either in vehicle speed sensor, instrument cluster or connection in-between? When you say You did the check do You mean check for error codes using VCDS or similar from the OBD? If not then You need to check for error codes, You can also see speed on it so you will see if the ECU gets speed data. Link to comment Share on other sites More sharing options...
CeffyMike Posted December 30, 2010 Author Report Share Posted December 30, 2010 i just pressed the check button on the dash. Thanks for the help . Im gonna take the cluster off tomorrow and see as according to a friend at audi its moer than likely the solder/wire on the back of the cluster speedo side. where is the speed sensor located out of interest so i can check that at the same time Link to comment Share on other sites More sharing options...
CeffyMike Posted January 19, 2011 Author Report Share Posted January 19, 2011 ok so about 2 days after i posted this i had to hit the brakes pretty hard and all of a sudden the speedo and everything started working, result :D then on monday morning i filled up with fuel, reset the trip like i always do and as i pulled away the speedo stopped again GRRRRR . Last night took the cluster off and couldnt see any visible dry joints, loose connections or damaged wires so its not on the instrument side. Drove home ( about 120 miles ) and still nothing and parked up. Got in the car this morning and its all working fine but then after 1.1 miles i was going round a roundabout and boom it stopped working again Is the speedo mechanical off the gearbox or is it electronic ???? Anyone else know where things are i need to look for as its starting to piss me off lol Link to comment Share on other sites More sharing options...
ainarssems Posted January 19, 2011 Report Share Posted January 19, 2011 its electronic Link to comment Share on other sites More sharing options...
CeffyMike Posted January 19, 2011 Author Report Share Posted January 19, 2011 cheers. need to get hold of a diagnostic kit then to see if there any error codes. I thoughyt it was possibly an incorrectly installed speedo cable/drive on the box from when it was last serviced hence excessive G force makes it work and stop workign Link to comment Share on other sites More sharing options...
AeIgHtLwB Posted February 22, 2011 Report Share Posted February 22, 2011 Hi there, Did you ever get to the bottom of your problem? As my speedo sometimes plays up also... (strangely its seems to do it mostly when the outside temp is very cold?) Also, my fuel gauge plays up when the speedo stops working, but is 100% accurate when speedo works!! I can't think of anything other than an earthing problem could cause this as the two systems are not connected... Regards Steve Link to comment Share on other sites More sharing options...
CeffyMike Posted February 22, 2011 Author Report Share Posted February 22, 2011 na never found out. sold the car now anyway Link to comment Share on other sites More sharing options...
PsYcHe Posted February 22, 2011 Report Share Posted February 22, 2011 sometimes a dry joint develops in the dash.. it's pretty easy to get the dash out and check it (if you know what you're looking for). Link to comment Share on other sites More sharing options...
Scouse_Phil Posted February 23, 2011 Report Share Posted February 23, 2011 Still working up to now! Touch wood! Link to comment Share on other sites More sharing options...
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