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Old 10-13-2005, 05:11 PM
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Could it be pinging?

I've always heard about it but never actually had it happen. Since about a week ago my truck started making a funny noise when I hit the throttle, specially when it's under heavy loads (starting in 2nd gear, or after switching gears, or going uphill, or accelerating hard) and it's like a high pitch sound...kind of like a a high tapping, hard to explain. So I was thinking might this be pinging? And how do I fix it?


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Old 10-14-2005, 05:41 AM
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Doc here,

sound like marbles rolling around inside a can??


Check your timing too much advance can do that..

also low octane fuel..raise the grade or add boost..

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Old 10-14-2005, 03:56 PM
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Probably not a problem on a 17 year olds car, but you may also have some carbon build up in you combustion chambers. This can increase you compression ratio or leave hot spots for the air/fuel mixture to ignite too soon. Usually this is more of a problem on a vehicle that is only driven slow.

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Old 10-22-2005, 04:45 PM
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Do like Doc said and check the timing. If it's right, put some 93 in it and see if it goes away.

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Old 10-22-2005, 11:57 PM
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If it turns out to be due to low octane, you can buy all kind of different octane boosters at the parts stores.


Your not running too high of a temp. are you?
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Old 10-28-2005, 12:59 AM
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gotta be careful with alot of those octane boosters, thier numbers can be misleading. If it says it raises it 1 point, that usually means .10 of the 93 we are used to. IE... you add one that says it raises 10 gallons of gass 1 point, and you have 87 octane in the tank, after you add it, you have 87.1 octane. Usually better to get 93 at the pump (if you can find it...).

- Croz

P.S. Anyone else notice a complete lack of 93 avaliable at the pump lately? My home town has almost always had it at every station because of the boaters that come in during the summer usually need/want it for thier boats... but in the last 3 months, every station has dropped it entirely. I have noticed it everywhere I have been lately too, is this just my part of the country?
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