What is the best way to approach replacing the spark plugs next to the fire wall? It seems to me coming up from underneath would be the best method, but I am not sure. My Buick has 110,300 miles in it and the pc shows a missfire on #2 cylinder.
You can reach from the top of the engine.It just takes some adjusting your hand and feeling around when you finally get you hand on the wires and plugs since visibility is not great.I just didi mine yesterday.
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When changing spark plugs I find it best to remove only one wire at a time. I remove the wire, change the plug, measure the old wire against the new wires, and replace the wire before moving to the next wire and plug. This way I do not have to know the firing order for the plugs.
Don't for get to check the plug gap.
It sounds like you are not firing on all cylinders. there could be several possibilities. Starting with the cheapest fix, replace the spark plugs. if the problem continues, you have a bad or plugged fuel injector or possible other things. The best approach after changing the plugs is to take you car to a dealer or simply have your mechanic or a friendly neighborhood motor head pull the codes. This is the best avenue to start with. .
On the 3.5L the Electronic Coil Packs are located over the Cylinders/Spark Plugs. These Coil Packs have seven (7) bolts on a Black Cover. Remove these seven (7) bolts, removing the Cover. Access to the three (3) Front Spark Plugs is now gained. The Rear three (3) Spark Plugs is the same, however it is in a tight spot near the Fire Wall.
Standard Rules: Some things are not Applicable for your specific engine. Use a Spark Plug Socket to remove and install Spark Plugs. Replace (remove) one Wire Connections at a time from one Spark Plug. Replace One Spark Plug at a time. Use Anti-Seize Grease applied moderately to the threads on the new Spark Plug. Using a Socket (with a extension) START all installations of all Sprak Plugs using your hands. This prevents cross-threading and stripping of the threads inside the Heads. Standard Torque 15-20 ft-lbs. Replace the One Wire Connection to that One Spark Plug. Replace that One Wire Connection to the Ignition Coil Connection. Go onto the next Spark Plug using the above Rules. Repeat.
For the 3.5L Firing Order: 1-2-3-4-5-6 Cylinders: .....(back) 1......3.......5 2......4.......6 ....(front)
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Obviously, the front three are fairly easy to reach. The rear three are the real problem. The easiest way to do the rear three is to jack the front of the vehicle up, crawl underneath until you can see the back of the engine from the ground, get real comfortable, making sure the engine and exhaust are cooled down, reach your arm up and pull the boots, very carefully.... then replace the spark plugs. You will not be able to see the plugs themselves, but this seems to be the easiest way to change them. Make sure you have a swivel spark plug socket and extensions and replace the spark plugs with platinum plugs so you can get another 100,000 miles and make sure you have anti seize so you can remove the plugs again in the future. The golden rule is that the engine has platinum plugs in there now and there good for 100,000 mile, if there are no misfire try not to change them unless you think your close to the end of the spark plug life or the check engine light came one to indicate that there are misfires. Good luck and hope this helps.
ok that is not the easy the ones in the front those are the easy ones but the ones in the back thse are dificul ones so in order to change those spark plug you need to race the car and try to change them from underneath this is one way the other way is to remove the intake sistem and change them from the top
The best way is from under the vehicle on a lift, or you can jack up the vehicle and support it with jack stands. You can access the spark plugs between the fire wall and motor from under the vehicle..