engine dies after hitting bump or with hammer

[chartierpw]

I have a 1997 Tracer, just recently replaced the EGR Sensor and the O2 sensor in response to the "Check Engine Light", a scan indicated these items were bad. The light is now out, but now EVERY time I hit a bump, the engine dies. I still have an electrical connection as all the indicators are still lit and the radio continues to play, I can restart the engine and continue until the next bump. Also, if I close the hood hard, the engine dies, so I tried hitting the car with a 4 pound hammer to the right or left of the raidiator, again, the engine dies. It I hit the strut tower with the hammer, nothing happens, only when I hit to the right or left of the raidiator. Anyone have any ideas?

[chartierpw]

Solved my own problem. In order to replace the O2 sensor, I had to remove the battery and battery box to get at the sensor plug whis is bolted to the transmission bell housing. When I removed the battery, I had inadvertantly lossened a relay/switch or some sort that was attached to the negative battery terminal. Tightened it up and we're 100%. Moral of the story ... check everything you did. (duh)