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Ford 290 boss spark plug removal 

 

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 Post subject: Ford 290 boss spark plug removal
Posted: Mon Jan 15, 2018 8:42 pm 
Stock as a Rock
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Age: 46

Posts: 119

Joined: 13th Mar 2008

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Ride: 03 BA GT XW GT Replica

Location: Legerwood
TAS, Australia

I have a 2003 BA GT and it has just dropped a cylinder or something. It just started running rough like its missing or cutting some cyliners back. I am thinking about changing the spark plugs. These are a four valve head and I have heard a lot about the 3 valve heads breaking plugs when removing them. can anyone tell me if the four valve have the same issue or did they fix it with these. It has 110,000 on it and never had plugs removed.

 

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 Post subject: Re: Ford 290 boss spark plug removal
Posted: Wed Jan 17, 2018 1:18 pm 
EFI Guru
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Age: 52

Posts: 4300

Joined: 5th Nov 2004

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Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

4V doesn't have the same issue as 3V with plugs.
You may find you have a dodgy coil rather than the plug itself which of course is an easy fix and your best bet is to buy a full set of Motorcraft coils from the U.S.
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