Waya_Silver

Hey everyone I'm in desperate need of help I was replacing knock sensors on my wife 06 Tahoe 5.3L and the front one came out beautifully unfortunately the rear is so badly rusted it disintegrated. from what I can tell the senor has separated from the crimp sealed top and the lower casing is rust welded to the side. I have already tried the following
Chisel, air hammer(low pressure just to break rust),

the_merv

iTrader: (88)

The Valley Cover has a removable rubber seal/grommet in that area around the bottom of both of them. Unbolt the Valley Cover, pry it off evenly on both sides and that rubber piece will come out of it. Then you can get at it. Done a few that way. The grommet is Dorman Part # 42003.

strutaeng

Yeah, remove the entire valley cover if possible. It probably needs replacement as well by now.

Waya_Silver

Got it thanks guys ya every online/other forms said this year had the reverse cone style and the sensor had to come out first but did what y'all said and boom pair of vice grips 30mins later clean and clear thank you will be heading to junk yard for replacement cover

the_merv

iTrader: (88)

You don't need a replacement cover, you just buy and put the new Grommet back in, why I took the time to even give you the part number.

Waya_Silver

Unfortunately I did need a new cover after cleaning up and looking over the rust had eaten through in one spot and nearly on few other spots just above the grommet level so either way I needed replacement. It was 10mins of work(lucky found engine with manifold already removed)and 13$ from a junkyard. So installed and back on the road

the_merv

iTrader: (88)

Not too bad then. I can see it in your pics, I have a spare one laying around if I need it for my stuff.

Waya_Silver

Definitely keep it trying to find on that's not arm n leg is pain