My 97 BMW 528i seems to have lost all compression after only changing the spark plugs. The car was cranking and running fine until one day I drive down the street to a friends house, I turned the car off to speak with my neighbor, then come back and the car will not crank. It sounded like it wasn't getting any fuel, like maybe the fuel pump had gone out on it. So, we take it back home and get to the fuel pump and we do find that there is a loose wire, which we fix. We also went ahead and changed two relays in the trunk. Now, the car turns over and cranks and runs for about a minute, then cuts off again. So, at this point, we think, maybe we should check the plugs. Well the plugs were burnt looking so we change those out. Once we change those, we try to crank it and it sounds as if there is no compression. It doesn't make any sense. How does changing the spark plugs do that? Is there a special plug we should have used? It had Bosch in there and we also tried that with no luck.
Thursday, November 1st, 2012 AT 10:22 PM