Vortec 350 Engine noise

I have an 98´ Silverado Pick Up with Hypertech Programmer and K&N Stage II Filter System. While accellerating with low rpm i hear noise from the engine, when i lift the pedal it´s better when the rpm increase - no noise. something to be worried about????

Reply to
Chevy
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What kind of noise? Knock, ping, bang, thud??????

Doc

Reply to
"Doc"

Sounds like "pinging" caused by excessive timing (BTDC) at the lower rpms. You may have to reprogram or better yet go back to you original timing to see if the noise goes away.

Hope that helps.

-Omar

Reply to
odelrio

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