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84LX89GT · 07-07-2005, 03:37 PM

It's hard to tell you without hearing it first hand. my first guess would be pinging. Try switching to a higher grade gas (like 92+ octane) and see if it quiets down. Also, if it does it more when it gets warm that's another sign that it's pinging.
Pinging is pre-ignition where there is a hot spot in the combustion chamber (on piston, on valve, carbon built up in bowl area) that ignites the air/fuel before the spark plug fires causing the piston to rock in it's bore causing a clacking noise.
That's my guess, see when it does it more and see if any of this helps. Good luck,

07-07-2005, 03:37 PM	#2
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	Re: Metal Clacking noise It's hard to tell you without hearing it first hand. my first guess would be pinging. Try switching to a higher grade gas (like 92+ octane) and see if it quiets down. Also, if it does it more when it gets warm that's another sign that it's pinging. Pinging is pre-ignition where there is a hot spot in the combustion chamber (on piston, on valve, carbon built up in bowl area) that ignites the air/fuel before the spark plug fires causing the piston to rock in it's bore causing a clacking noise. That's my guess, see when it does it more and see if any of this helps. Good luck, __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)