I removed the alternator, but it appears that more accessories will have to be removed to gain access for the spark plug wires to be routed to the distributor from each of the spark plugs.
THIS VEHICLE HAS OPTIC SPARK DIST. THE PLUG WIRES RUN ALONG A CHANNEL BEHIND THE ALT AND A/C COMPRESSOR. THE WIRES MUST BE PROPERLY INSTALLED IN THE CHANNELS OR CHAFFING AND PINCHING WILL RESULT. VERY GOOD SYSTEM, JUST A LITTLE HARD TO REPLACE.
SOURCE: Replacing spark plug wires on 1995 Buick Riviera
You need to drain some coolant. Loosen and disconnect water lines by the firewall- the ones in the way of your wire change. u need to get a diagram of the firing order of the engine so that those wires are correctly connected to the coil packs.
SOURCE: Cannot change 3 rear spark plugs on 1999 Buick park avenue
there is a special tool for this job but I have cheated on this but you ned to be careful when doing this.The wishbone shaped mount on the front going from motor to front of vehicle, remove and it allows the motor to tilt.
SOURCE: How to remove/replace spark plug wire routing clip
Typically, spark wires are encased in a flexible plastic tube which is secured in usually 2 places with special clips. The tubing material gets brittle over time and cracks /breaks easily so patience and being careful are the key. After you remove the tube from its mounting points, you will notice that the tube has a split over its entire length. Carefully spread the split open at on end then pull (one wire at a time through the split. then reverse the process with the new wires..... unfortunately this is even more difficult and requires even more patience... good luck....
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