Change spark plugs 93 grand prix

knock sensor i have costumer like that trouble i change that sensor

You will need to remove the coil packs first. To remove coil packs, undo 4 bolts and tip the coils over to the side.

Users on the internet say also that you can remove two engine top mounts to access the plug wires. See links below:

WikiAnswers - How to change spark plugs on 1999 pontiac grand prix

How to Replace Spark Plugs in a Pontiac Grand Prix |

How to Replace Spark Plugs in a Pontiac Grand Am

Yahoo! Answers - 1999 Pontiac Grand Prix Spark Plugs?

Just a tight situation. Small arms help. Best access is from drivers side reaching down between firewall and engine. You will have to find and follow a plug wire one at a time, twist and pull off. ( careful wires if old will break off and a new set will be needed). Using same technique install the spark plug socket on the plug and appropriate extensions to get a good working clearance to loosen plug. Reinstall new plug in reverse order after checking gap. Plugs are in at an angles. You can see them if you really lean in and look down behind engine. It will just be a trial and error on gaining access and changing the plugs one at a time. A plug socket, a 2 inch extension and a 3/8 drive ratchet should do. Don't scrimp on cheap plugs. Good luck

My sincere apologies for the delayed response.
I am personally going back to answer your unanswered question.

For the 2.8L
Firing Order:
1-2-3-4-5-6

Cylinders:
......(back)
1.......3.......5
2.......4.......6
......(front)

Ignition Connections (Spark Coils):
........(back)
.|.1..4.|.|.6..3.|.|.2..5.|
........(front)

Again my apologies....
Let me know if this helped...

do an internet search for "idle learn procedure" for your car and follow the steps. worked great for my 93 grand prix

check the fuel pressure on the fuel rail you may have to change your fuel filter it may have rust built up in it

I used to have a Pontiac in which I had to pull the front tire off and then get to the plugs by going over the A frame. Doesn't mean it will work on your Grand Prix but you might try it.

try changing the plug wires good luck

look under hood for main fuse panel, make sure relay for eng. control module is good. Most of relays in that panel are the same, just swap one around or you can check conuity on relay

you can use a 3 nch extension and a universal joint attachment to reach these. It is still a little tricky but it will work.