Knock Sensor Question - Ferm/Spare!!!

[THEFERMANATOR]

Originally Posted by spareparts

gotcha, I'm thinking old school small block

Yep, GM used to put them down in the block drains where they were easy to get to(unless it was the 4.3L where they put them in the heads, still not that bad to get to). For the LS engines they moved them under the intake.

[ssiredfish]

I read somewhere that it can be accessed through the front pass wheel well. Do you know if thats possible?

[THEFERMANATOR]

Originally Posted by ssiredfish

I read somewhere that it can be accessed through the front pass wheel well. Do you know if thats possible?

Maybe on a 5.7L, but on a LS engine they are underneath the intake manifold, and require engine teardown to get to. This pic will give you an idea of where they are at. They are under the rubber plugs in this pic.

[spareparts]

story goes(it was in Hot Rod)some guy was talking to the Cadillac engineers about the starter in the NorthStar engine and how stupid it was to mount it in the the engine valley. The Cadillac guys stated that the starter in the Northstars had the lowest failure rate of any of the GM engines and they had engineered it to be almost infallible. The guy asked them why the did put that starter on all the other engines if it was that good, the engineers didn't know how to answer

[phatdaddy]

redfish, i have an 02 tahoe w 5.3, same thing happened. went through a deep puddle and 1 week later, got the same code. had to replace the sensors and wire harness. and manifold and vc gaskets. i went with the gm sensors, aftermarkets were bout 50 bucks cheaper, but hassle of getting to them, i went with oem.

[ssiredfish]

Yea this doesnt sound like any Saturday I wanna be a part of....I just reset the codes so I'll see if it comes up again(fingers crossed)

Phat - Lots of guys that had the same issue replaced both the sensors. More than half said after replacing one the other went out. Basically from what Ive seen its two sensors at $60 each and 3hrs of shop time.

Lets hope it was just a dirty sensor and its had time to dry out....I keep ya posted.

[phatdaddy]

i'd definately replace both. if i remember, the gmc's were about $150-$175
it's like anytime i have to put in a heater core or an evaporator , i change em both.
same with a washer & dryer.

good luck