Question about 1997 Audi A4

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My 97 audi A4 pinging after driving for 10 to 15 minutes.

I don't know whats wrong with my 97 A4, after driving for about 10 to 15 minutes it start pinging and it won't go anymore.

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That 'ping' caused by pre-ignition can punch holes in the tops of pistons so should not be ignored.
There is a device called a 'knock sensor' that feeds information to the computer which, in turn, retards the spark very quickly to prevent it from happening.  Very poor gasoline can cause this but watching over the ignition noise allows a car to tolerate a broad range of octanes without suffering damage.   
BTW, when ping occurs, this means that the spark has been supplied too early in the compression stroke and this causes the expanding gases to hammer the piston down before it can complete its stroke; this not only will damage the pistons but robs the engine of power, something you have already noticed. 

Posted on Apr 21, 2009

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Posted on Jan 02, 2017

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