How do you replace the spark plugs in a 1999 Grand Prix SE?

Answer 1

While the above link is a guide for changing sparkplugs (really easy on a V8 RWD application) there is additional information available that will make the process easier when changing them in a 3.8L FWD V6 configured vehicle. (I am not sure about the smaller V6 in these cars) This info comes from a GM service person and this is how it is done at the dealer. Some people will remove the two front motor mounts (dog bones) and with the car in park push the car forward to rotate the engine and apply the parking brake to hold the car. (Carefull not too far and damage the radiator) If you can get your eng to rock forward, that gives you more room in the rear to remove the back three plugs -this is the easiest way. Or with alot of patience and small hands (because there just isn't much room behind the engine) a swivel and an extension. I would recomend that you replace the plug wires at the same time because the boots usually break when you remove them and with the engine rotated forward they are easier to get at. When re-installing the new plugs, it is important to make sure you get several turns on the plug before putting a wrench on it. The last thing you want to do is cross thread a spark plug. The new plugs should almost bottom out before requiring a wrench. Dont skimp on plugs and wires, pay the extra $$ for premium and save yourself some headaches and performance problems. (source: http://www.grandprix.net/) Hope this helps. G