Changing spark plugs 2003 Impala 3.4 eng. i.e. removing and reinstalling upper intake manifold
I've never changed plugs in this car. It has nearly 94,000 miles. Descriptions say you must remove the upper intake manifold to replace the firewall side plugs. How difficult a job is this? Will it require more tools, such as a torque wrench and/or new manifold gaskets?
I have a 2003 chevy Impala and it's not so difficult. Try using a small ratchet that fits in the palm of your hand, I can't remember what it is called. To install the plugs use an extension and put a couple of the card board pieces from one of the spark plug boxes in between the new spark plug and the spark plug puller socket, this will hold the new plug in place while you work with the extension. When screwing in the plug you will have to go by feel so move the extension back and forth like a light jiggle while turning to avoid cross threading the plug. After the plug is tightened attach the ratchet and slightly torque into place.
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The 2006 Impala has 3 different motor options, on the 3.5 the map
sensor is located on the rear(left side of motor) of the upper
intake manifold under the black bracket that the spark plug wires
are routed over. You have to remove the two upper intake manifold
bolts to remove it. The bolts have a torque spec of 18 lb ft, and a
small amount of thread locker is recommended by GM after
You'll need to remove the oil cap and the 6 bolts holding on the engine cover. The front 3 spark plugs are pretty easy to replace. You'll need to unplug the spark plug wire from the coil and disconnect the electrical connector. Unbolt the 2 10mm bolts holding the coil to the valve cover. Twist the coil and boot back and forth and pull it out of the cylinder head. The spark plug is down in the head, you'll need at least a 6 inch extension with a 5/8" spark plug socket, a telescopic magnet will help get the spark plug out of the head. The back 3 spark plugs involve removing the upper intake and throttle body, unbolt the bracket to the throttle body, and the bracket bolted to the upper intake manifold. on the back side of the engine. Remove the tubing from the throttle body to the air cleaner box. Unbolt anything else bolted to the upper intake. Unplug electrical connectors to the throttle body and any other electrical connectors on the upper intake and remove the upper intake bolts. And move the upper intake out of the way, there are only spark plug wires on the back 3 plugs. Twist and turn each boot to aid in removing the boot from the plug. I would get a new upper intake gasket and consider replacing the wires at this time also. There are actually only 3 spark plug wires, so for what is involved to get to them, I would replace them. I have found alot of the wires will arc to the upper intake manifold.
If you have a 2000 VW Golf 2.0 liter, the answer is yes. Just remove the top part of the intake manifold. A magnet and long handle allen key set will make the job easier for removing/ reinstalling the cap screws. Once manifold off, cover the intake holes with blue painters tape, to avoid dropping any thing down in them. Take care on plug wire removal. Change each plug one at a time. ***Tighten spark plugs with a torque wrench, spec 22 ft-lb in the Bentley manual. AEG, AVH, AZG eng codes***
Need to remove upper intake manifold to reach valve cover close to firewall. 1) The location of spark plugs 456 are under the plastic shield in front of the engine. It takes an 8mm socket to remove the three bolts holding the shield once the shield is removed you will see a coil for each spark plug. Use the 8mm socket and remove the coil and rubber boots. You will now see the spark plug (note there are not any spark plug wires). 2) The location of spark plugs 123 are located to the rear of the eng. You have to remove the air intake manifold in order to get to the spark plus. Remove the throttle wire then remove the other items on top of the intake manifold.
Need to remove upper intake manifold to reach valve cover close to firewall.
1) The location of spark plugs 456 are under the plastic shield in front of the engine. It takes an 8mm socket to remove the three bolts holding the shield once the shield is removed you will see a coil for each spark plug. Use the 8mm socket and remove the coil and rubber boots. You will now see the spark plug (note there are not any spark plug wires).
2) The location of spark plugs 123 are located to the rear of the eng. You have to remove the air intake manifold in order to get to the spark plus. Remove the throttle wire then remove the other items on top of the intake manifold.
3) Loosen all the bolts holding the manfold. 8mm socket-- I think three in front and three in the middle. Remove the EGR valve mounts so you can slide the manifold out. Disconnet all vacuum lines from manifold and the air filter inlet closet to manifold. Just take a general look and ensure you have all wiring and tubing disconnected then slide the manifold off the eng and EGR valve.
NOW MAKE SURE you cover all intake holes (leading into the engine) with paper towels to prevent droping screws etc into the engine. Then follow step 1 above
I'm fairly certain those motors require the upper intake manifold be removed to gain access to the rear spark plugs. You might be better off bringing it to a qualified technician as it gets fairly involved. If i remember correctly it's about a 2 hour job and requires a few gaskets.