2002 Chevy Tahoe Engine "knock", Maybe Knock Seno

Tiny
HEFFE
  • MEMBER
  • 2002 CHEVROLET TAHOE
  • V8
  • 2WD
  • AUTOMATIC
  • 10,700 MILES
I own a 2002 Tahoe with 107,000 miles. It is the Big V-8 5.3. Around 95k miles the Service Engine Light. I downloaded the faults and had 2 faults for running Rich and 1 fault for a miss fire. I have replaced all 4 o2 sensors and now the only fault is the miss fire. The engine itself works great after a 15 minute warm up period (during the warm up period, RPM's flux betweeen 200 and 1500) It has actually died a couple of times. It also has a "surge" like feel to it at stop signs and red lights. I was wondering does this sound like a possible set of bad knock sensors or should I be looking somewhere else?
Tuesday, December 9th, 2008 AT 11:51 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,454 POSTS
Hi:
Based on your description, it doesn't sound like the knock sensor. It sounds more like a throttle position sensor. When you get the random misfire code, are you able to identify which cylender it is?

Joe
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Tuesday, December 16th, 2008 AT 7:47 PM

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