The 04 silverado told me for the second time that the knock sensors are not working. GM put them under the intake, which I have no interest in pulling. So an interesting video came up suggesting using 2 threaded bosses in the driver side head. It got a lot of positive comments, a set of cheap sensors and harness were under a hundred buck so what the heck. Anyone out there tried this?
Other than the fact that the intake is easy to remove, plus it probably needs gaskets anyway, it's probably a fine idea.
You don't even have to drain the coolant.
In reply to porschenut :
Not on an LS, but the previous owner of my XJR Jaaaag did exactly that "temporary" repair. It was that way when I bought it, and I continued to drive it for 35k miles over four years. Sold the car that way too. No problems.
Go for it.
It used to be pretty standard procedure to do something similar on the old 3.3 Nissans.
I wouldn't do it on an LS because the intake is super easy to pull, the gaskets are probably bad anyways, and if you do it correctly (torque them, RTV the galley plugs in, and build an RTV wall around to keep the water out ) you shouldn't have to ever do it again.
Those bosses are where the knock sensors used to go.
I am pretty sure that you would have to go in with HPT and either reconfigure the tune to know which sensors read which cylinders (1-3-5-7 and 2-4-6-8 vs 1-2-3-4 and 5-6-7-8) or you may need to burn a different OS, if there is one, for them to work correctly.
Knock sensors are pretty important because EVERY time you add fuel, the computer goes to the high octane timing maps, then switches to low octane maps if it senses a lot of knock.
Or, it may be a case of good enough really being good enough?
It does seem like a ton more work than just pulling the intake, as mentioned.
I do not plan to change the tune but will start running a higher octane when pulling a trailer. As far as the intake being easy to pull, maybe for you. I am 5'5" and would need to build a platform to be able to get any reach in there. The video I watched was 3 years old with a bunch of feedback from people, it looks like an easy and basic thing. I can monitor the knock sensor while driving via a torque app on my phone, if it doesn't work the intake comes off. But for the price I will give it a shot. Thanks for the input, I will report back on this in a month.
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