Bonneville Rear Spark Plug Removal - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-17-2009, 10:47 PM   #1
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Default Bonneville Rear Spark Plug Removal

96 Bonneville SE vin K

Any special tools or procedure to get the rear plugs out.

Iíve only tried on the drivers side far cylinder ( I think cylinder 6 ) and canít seem to get enough leverage on it. I removed the sway bar as recommended. On one side you are right up against the brake booster hose and on the other side is the bracket for a wire loom and fuel lines; on firewall side is the heater fan motor and box.

It seems like a Ĺ inch breaker bar would do it but donít want to over force it and break the plug. Iíve also tried to spray BP blaster on it but not very successful because of poor access space. I am using a 5/8 plug socket.

So far Iíve tried:

a. craftsman 3/8 drive probably 7 inch ratchet

b. craftsman Ĺ inch drive ratchet probably 9 inch ratchet

c. spark plug swivel socket with T handle from autozone ( too short of handle).

Iíve changed the front bank of plugs.

Thanks for your suggestions
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Old 06-17-2009, 10:51 PM   #2
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You might need to apply some force to get them to brake loose if they have not been changed in a long time.
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Old 06-18-2009, 12:06 AM   #3
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Go to hard ware store get a piece on pipe 1/2 to 3/4 round about 2ft to 3ft in length place it over your ratchet that is placed onto your spark plug and pull hold the ratchet close to the plug with your one hand and pull with your other hand. Once it gets loose just use your ratchet to take it out. Also the back plugs are put in at slight angles be sure to note that when you have placed your ratchet on for removal. I just did this last week and let me you tell you the back plugs were hard to get to but once I piped my ratchet they didn't stand a chance. Best of luck and let us know the results. Don't forget to use your antisieze on your new plugs. Thanks
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Old 06-18-2009, 12:34 PM   #4
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where are you located?

best bet is to put a blanket on top of the engine and lay on the engine, twist and pull the wires off, wear gloves, then using an open hand, push with all your might toward the right till they break loose....good luck
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Old 06-18-2009, 07:59 PM   #5
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Remember that being backwards, you'll want to set the ratchet before putting it into the engine bay. This ensures you aren't trying to tighten things.

They can be in there pretty good though and you don't want one to snap in the head.
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Old 06-18-2009, 08:43 PM   #6
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I've snapped 2 off in the head in the past. If you do this, you will need a set of easyouts.
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Old 06-21-2009, 07:17 PM   #7
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If you are afraid on breaking them. Try shocking them with a jolt. With you breaker bar on use a mallet of hammer to hit the bar to turn the bar counter clock wise. The shock will work to break it loose.
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