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Originally Posted by wesweaver
I'm in need of some help. What would cause one cyclinder to foul plugs. I have a 400sb. I don't know all the spec's on the motor. It was installed in the truck when I got it. The problem started a week ago. The truck started running like crap. It would idle fine, but when you got on the gas it just putted along. A friend said it sounded like a fouled plug. Low and behold it was. It was fouled bad with a butt load of carbon build up. The truck runs good now wioth a fresh set of bosch plats in it. I had A/C delco r45st in it. If it happens again what do you guys suggest my course of action be. Thanks for the help in advance.
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If you've checked the obviouse things (ignition system, fuel system) I'd have a leak down test done. Did one prior to my rebuild, after I got the bad news, it was determined that #8 had 0 compresson and #5 was cracked. Heads were warped and 2 springs were broken. Believe i or not, only at idle you could tell something was really wrong.