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Old 05-07-2014, 04:35 PM
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Do spark plugs go bad if a car was parked for a long time?

My wk2 was almost never used for around 2 years. It was hardly moved and it stayed on park for a long time. It only has 13k miles logged. I am not getting that great MPG, I am averaging 12.1 according to the dashboard. I am thinking that maybe spark plugs went bad since the car was involved in a rollover and was not driven for a long time. Lots of work was done on all the wiring and even changed the ECU since the old one went bad. Should I remove and inspect sparks? Or just buy and install all new ones? it's cheap so I wouldn't mind. Thanks guys.

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Old 05-07-2014, 04:39 PM
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Re: Do spark plugs go bad if a car was parked for a long time?

Add a bottle or two of injector cleaner and run a tank of gas through it.
I like Techron from Chevron, available about everywhere, including Walmart, Auto Barn, etc.

A lot of folks prefer SeaFoam, but I haven't tried it.

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Old 05-08-2014, 04:06 PM
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Re: Do spark plugs go bad if a car was parked for a long time?

Quote:
Originally Posted by bill_de View Post
Add a bottle or two of injector cleaner and run a tank of gas through it.
I like Techron from Chevron, available about everywhere, including Walmart, Auto Barn, etc.

A lot of folks prefer SeaFoam, but I haven't tried it.

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I haven't tried Seafoam on the 2014, but it worked like a charm on a 95 ZJ with 4.0 in dealing with driveability as the alcohol and other cruft keeps creeping up in gas.

Gave it one direct cleaning and after that just added a bit to the fuel. Made it almost driveable in whatever re-used septic tank effluent Los Angeles area uses in their fuel.
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Old 05-08-2014, 04:19 PM
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Re: Do spark plugs go bad if a car was parked for a long time?

You didnt say how may tanks of gas you've put through it since you tried driving it and/or when you did start it, if the gas in the tank was not drained and refilled. My assumption was that it wasnt and had gone bad, plugging up your injectors, etc.

Go buy a good injector cleaner and run that through a tank or two of gas. If you dont see things start to improve you may need to get things cleaned out by a shop.

Spark plugs shouldnt be a problem. They can sit for years and not go "bad". If you can pull the plugs, they may give you an indication (check the color, etc) about whats going wrong in your engine and why your MPG is so bad.
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