Fouling out 1 spark plug (cyl 2) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-08-2012, 08:05 PM
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Fouling out 1 spark plug (cyl 2)

Looking for some advise. I have a chevy 400 small block. It is procharged with 20 lbs of boost through a blow through carb. I keep fouling out cylinder 2 spark plug. It is almost instant when I drive the car. I have gone through the heads (at the machine shop), carb ( at C and S ) and blower ( at procharger). Some say it may be the way the fuel is being blown into that cylinder. Maybe an intake issue. Any input would be great.

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Old 03-08-2012, 08:19 PM
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I would do a spark test and see what color the spark is on the number 2 cylinder plug wire. Test and compare it to other cylinders. If the spark on cylinder 2 is yellow it means it's weak. If it's blue it's normal. If other plug wires show a good spark but the number 2 shows a yellow spark then you know it's either the plug wire is bum or the terminal in the cap is caushing excessively high resistance. Unless the intake valve is stuck open which would be obvious if it was then there's no reason why that cylinder would get more than the rest, especially considering its the most forward cylinder on the passengers bank. Other things that could cause it is bad rings, broken piston, vad valve guides, bad valve seals just to name a few. Do a compression test on cylinder number 2. If it checks okay then do a leak down test on it.
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Old 03-08-2012, 09:36 PM
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Thanks for the response. I have new plugs, wires, cap and rotor. Compression is good. Did a leakdown. Had a complete valve job done. It starts to break up past 2500 rpm. Once there is a load on the engine. Thats also where the boost comes in. Maybe the fuel is being pushed into that first cylinder causing it to be rich. Any ideas? Thanks
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Old 03-09-2012, 06:23 AM
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It is fuel. The plug fouls in less than 2 miles. Liie fuel is being dumped down that cylinder.
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Old 03-09-2012, 06:53 AM
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The carb was just gone through at C and S. My plans were to drive it with the hat off and a new plug as soon as the weather clears. I will repost then. Thanks
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