I have just changed my tstat and now I have no spark at all. I had to remove the serpantine belt but I did not remove the timing belt. I have checked all the electrical connections and vacuum and I cannot find the reason why it wont start. It started fine before and idled perfect but now I get nothing at all. People have suggested that it has jumped timing but this is not possible since I never removed the timing belt. Please help I am absolutly out of ideas.
no spark after tstat change on 1994 Audi 90
by johnnykanoo in Manchester, CT on September 12, 2009
ANSWER by patrick mannion , September 13, 2009
It almost has to be an electrical connector that is disconnected. I wonder if plugging in a scan tool is going to be the quickest diagnostic test you can do. Plugging in a scan tool may show open airflow meter, or open crank sensor circuit. Do you have good repair information. There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You get a one year subscription to year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual. http://www.alldatadiy.com/
ANSWER by Visitor , May 27, 2011
I think the crank sensor on these engines is in the area of where you were working, check that you did not accidentally unplug it as that would surely cause a loss of spark. Hope this was helpful Ryan Mode Mode Automotive 858-361-4645