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R

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Discussion Starter #1
Hello,

Can you think of any reason why my truck would ping unless the knock sensor
is shot? I took it to the dealer and all they did was tune it up and tell
me they couldn't hear the pinging. I've even tried 92 octane but that
didn't help.

Thanks for any thoughts you may have.

Ron
 
K

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Discussion Starter #2
Ping, actually pre-ignition spark knock, is only caused in a modern
(post-1986) engine for two reasons...defective part in the
electronic control system or carbon in the combustion chamber. If
carbon has built up, it may glow red hot and ignite the fuel mixture
before the spark actually fires.

Try one or two treatments with a good fuel system treatment like
Chevron Techron Concentrate (not the cheap Pro-Tech), BG 44K, Red
Line fuel system cleaner.

Also consider that the noise might be something else that sounds
similar. A mechanical banging from part of the exhaust system, for
example, might sound similar.

Vehicles don't need "tune ups" any more. They do need regular
maintenance including new spark plugs, air & fuel filters, coolant
flush & renewal...it's all listed in the owner's manual. Some are
time related (coolant) and some are mileage related (plugs & filters).

Ken


Ron wrote:
> Hello,
>
> Can you think of any reason why my truck would ping unless the knock sensor
> is shot? I took it to the dealer and all they did was tune it up and tell
> me they couldn't hear the pinging. I've even tried 92 octane but that
> didn't help.
>
> Thanks for any thoughts you may have.
>
> Ron
>
>
 
R

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Discussion Starter #3
Thanks Ken for your input. I'll give the Chevron Techron Concentrate a try.

FWIW.. I've only got 50,000 miles on the truck, the plugs have already been
changed twice, the filters all get changed on a regular basis and when the
dealer did the last "tune up" they added some kind of treatment to the fuel.
I've also used Chevron Techron in the past, but not sure if it was the
Pro-Tech stuff. I'll look for the good stuff this time.

The pinging noise only happens either when shifting (and my foot is heavy..
ie passing) or when the truck is loaded and I'm heading up a hill.

Thanks a gain for your input. I'll let you know if the fuel treatment does
the trick.

Ron

"Ken Shelton" <[email protected]> wrote in message
news:[email protected]
> Ping, actually pre-ignition spark knock, is only caused in a modern
> (post-1986) engine for two reasons...defective part in the electronic
> control system or carbon in the combustion chamber. If carbon has built
> up, it may glow red hot and ignite the fuel mixture before the spark
> actually fires.
>
> Try one or two treatments with a good fuel system treatment like Chevron
> Techron Concentrate (not the cheap Pro-Tech), BG 44K, Red Line fuel system
> cleaner.
>
> Also consider that the noise might be something else that sounds similar.
> A mechanical banging from part of the exhaust system, for example, might
> sound similar.
>
> Vehicles don't need "tune ups" any more. They do need regular maintenance
> including new spark plugs, air & fuel filters, coolant flush &
> renewal...it's all listed in the owner's manual. Some are time related
> (coolant) and some are mileage related (plugs & filters).
>
> Ken
>
>
> Ron wrote:
>> Hello,
>>
>> Can you think of any reason why my truck would ping unless the knock
>> sensor
>> is shot? I took it to the dealer and all they did was tune it up and
>> tell
>> me they couldn't hear the pinging. I've even tried 92 octane but that
>> didn't help.
>>
>> Thanks for any thoughts you may have.
>>
>> Ron
>>
 

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2000 Tundra V8
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2000 Tundra pinging

My truck started pinging (only under load and/or heavy acceleration) after 100K and long after the headers and K&N installation. Higher octane gas did not help and I don't suspect the valve train as the truck has been bullet-proof for 12 years. Mass airflow sensor cleaning (very gently) seems to do the trick, though.
 
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