I bought a 2005 MPV on Marketplace. It has 120,000 on it. The water pump was out and it had a blown head gasket so I put new head gaskets on and timing chains too. Now this van would start before I put the new parts on but as the temperature hand came to normal operating temperature it would start up cold and run as if there was nothing wrong. But now no spark. Fuel pump runs. But no security light.