engine pinging

TOYOTA COROLLA
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WAY7158
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  • 3 POSTS
I have a 2001 Toyota Corolla with 128,000 miles. It recently started pinging when I accelerate anytime over 50 mph when the outside temp gets above 85, the warmer it gets, the louder it gets. I have replaced the spark plugs (NGK Iridium). I do not have an EGR, the timing is controlled by the ECM and is not user adjustable and each cylinder has its own coil. I have changed brands and grade of gas with no change. The only sensor I can't check easily is the knock sensor(remove intake manifold) and it costs between $160 and $200. Any ideas would be greatly appreciated!
Aug 28, 2007 at 1:46 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
[quote:e0b3998a15="way7158"]I have a 2001 Toyota Corolla with 128,000 miles. It recently started pinging when I accelerate anytime over 50 mph when the outside temp gets above 85, the warmer it gets, the louder it gets. I have replaced the spark plugs (NGK Iridium). I do not have an EGR, the timing is controlled by the ECM and is not user adjustable and each cylinder has its own coil. I have changed brands and grade of gas with no change. The only sensor I can't check easily is the knock sensor(remove intake manifold) and it costs between $160 and $200. Any ideas would be greatly appreciated![/quote:e0b3998a15]

Could be bad gas/an engine that's overheating/carbon bulid up in the combustion chamber or the KS itself.
Sep 1, 2007 at 9:53 AM
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