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Old 04-12-2012, 12:09 AM   #1
maxbr7t
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Member#: 206215
Join Date: Mar 2009
Location: MA
Vehicle:
1999 Forester
Green

Default Forester spit out spark plug

I have a 1999 forester with 147k. the other day it was driving it and my car started bogging, i thought it was an exhaust leak in my cat or something. Eventually it turned into a loud as noise that sounded almost like a cat leak. When i got home and got out of my car i realized it was a misfire and my car spit out my #4 cylinder spark plug. It messed up all the thread too. I ended up going to autozone and picking up a thread kit and just threading an adapter into the cylinder head instead of doing a helix coil. Just wondering if this is a common occurrence in these cars. before this i never even heard of that happening.
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Old 04-12-2012, 03:38 PM   #2
JohnM10
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Member#: 244231
Join Date: Apr 2010
Chapter/Region: NESIC
Location: Providence, RI, USA
Vehicle:
2006 Impreza 2.5i 5M
Crystal Grey Metallic

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Who installed the last set of spark plugs and were they tightened to the correct torque specs?
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Old 04-12-2012, 06:52 PM   #3
D3F0
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I bet they were just loose or installed sideways to the point where they were not tight enough and forced out from vibration and then engine running.
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Old 04-12-2012, 10:55 PM   #4
maxbr7t
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Green

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it wasnt me ill tell you that lol.. probably the handy work of the previous owner, ive only had the car for like 4k miles..
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Old 04-13-2012, 10:25 AM   #5
JohnM10
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Member#: 244231
Join Date: Apr 2010
Chapter/Region: NESIC
Location: Providence, RI, USA
Vehicle:
2006 Impreza 2.5i 5M
Crystal Grey Metallic

Default

My guess would be that the threads were already stripped or cross-threaded and the previous owner installed the plug anyway hoping it would stay in until the car was sold.
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