Spark knock issue

Tiny
LEPPORDOG
  • MEMBER
  • 2000 DODGE INTREPID
  • 2.7L
  • V6
  • FWD
  • AUTOMATIC
  • 240,000 MILES
My car suddenly went from 240 miles per tank to 150. Performance does not seem noticeably affected and not burning rich (no black smoke or raw fuel smell), but I noticed that when taking off from a stop there is a noticeable spark knock rattle and same upon heavy acceleration that was never there before. I installed mechanical temperature gauge to get accurate temp reading and noticed the spark knock was gone although the power suffered due to PCM not getting temp signal. Have had excessive oil on top of valve covers. EGR problem?
Monday, October 2nd, 2017 AT 9:55 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Sounds as if you may have a failed knock sensor, run a scan and check for relevant codes. Not all codes will set a check light. The knock sensor picks up vibrations in the engine from engine ping and sends a signal to the PCM to alter ignition timing accordingly, start here.
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Tuesday, October 3rd, 2017 AT 2:52 AM

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