4 Wheel Drive/SUVs/Spark plugs

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Question
I had a tune up done on my 02 Buick Rendezvous in August 2011. I have not touched the spark plugs etc since and have maintained oil changes and fluids since. My car just broke down with a pop a engine and a flutter sound. The tow truck driver and an independent mechanic of 40 yrs, looked at it. A spark plug blew out; both looked at the spark plug and see slivers on the threads and said they are pretty confident it was partially stripped being put in and just eventually blew out under pressure. They dealership that the tune up was done at said it could be possible at the beginning but now that I'm not willing pay additional costs, are stating its not possible to have lasted a yr and three months.: My question is Can a partially stripped spark plug hold out this long before blowing out?

I understand this is an opinion only but would appreciate feedback.

Thanks,

Answer
Tori,

Simple answer is yes.  Depending on how bad it was stripped in the first place can make the difference.  Sometimes it takes quite a while for them to move in the threads before they finally break free.  Regardless, if it blew out, there was a faulty component, such as bad threads on the spark plug itself, or the mechanic cross threaded the plug when it was installed.
If the dealership wont repair the problem, contact your Bureau of Automotive Repair in your State, and see if they may address the problem with the dealer.

Carl

4 Wheel Drive/SUVs

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Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles, and I suggest that you obtain a repair manual for mechanical problems and do some research before asking your question. Most mechanical questions can't be answered completely without looking at, or listening to the vehicle in person.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

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