Hi there,
Thank you for the donation,
What you may have is a faulty knock sensor, this is a sensor that detects engine ping and send a signal to the ECU to re adjust the ignition timing accordingly, I would have the ECU scanned for a fault code, you don't always get a check engine light with a fault code set, start here.
Mark (mhpautos)
SPONSORED LINKS
Sunday, August 24th, 2008 AT 10:30 PM