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Old 04-13-2008
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knocking sound when i accelerate

i noticed the other day that when i accelerate and put it to the floor, i hear a slight knocking noise. Anybody know what this could be? i just changed my oil and it is still doing it.
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Old 04-13-2008
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my dads truck used to do this ever since we got it in '93. it was a '92 f-150 with a 351w in it...eventually the motor blew when we were going fishing riding down i-20 and i think it ended up being a blew rod bearing. try putting a quart of STP oil treatment in your truck. if its only a slight knocking this should calm it down
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Old 04-13-2008
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Does it do it only when you are in drive, or even when you rev it in park? And does it only do it when you accelerate hard?
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Old 04-14-2008
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If it's only doing it at heavy throttle? It could be a problem with timing / octane / carbon build up.

First, try running a tank of 92-93 octane. If it goes away then you'll know that's the problem. If it's still there.. then its something mechanical.
Second, I'd suggest running a straight 30w oil.

Rich
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Old 04-15-2008
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i'm not sure if it does it while i have it out of gear...i will have to check on that. to answer your other question, yes, it only does it when i put it 3/4 or more to the floor. i will try running a higher octane and see what happens. so what happens if the sound dissappears after i use a higher octane, does that mean i should use 92-93 octane all the time?
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