Torqued

Did GM release an updated knock sensor for the 98 LS1s? I want to replace the knock sensors when I intsall a LS6 intake in hopes of exorcising a persistant 4 KR at WOT. For some reason I thought a revised one was made for the 98's.

Thanks

Predator

Yeah, the knock sensors that are used on the '99s and up. Get a new wire too.

Another_User

I tuned it out with HPtuners. No problems here.

Torqued

Just for clarification part no. 10456222 is the latest version for the 98's? I didn't think the later model year sensors would work becuase of a different connector.

Thanks again.

Predator

I'm not 100% sure about this, just 99.9%, but the newer sensors screw in the same as the '98s, it's just that the wire connector is different, so you'd need to get a new wire with the new knock sensors.

KS: part #10456603

KS wiring harness: part #15372170

Torqued

Thanks. Getting a new wire makes sense now.

SmokingWS6

iTrader: (1)

How does the new wire connect into the harness? I've never looked at changing that before.

Predator

The same as the 98s. The difference is at the knock sensor end of the wires.

Another_User

I won't be replacing my sensors until I replace my intake manifold. Otherwise it would be a waste of time.

SmokingWS6

iTrader: (1)

The 99+ update isn't cheap

100 for 2 ks's and the harness.

Predator

That doesn't seem too bad considering that someone else here paid $55. each for the knock sensors, at a dealership. And it seems that you're not replacing bad sensors, just upgrading them.

You could probably get everything a lot cheaper at gmpartsdirect.com.

SmokingWS6

iTrader: (1)

I have my dealer discount, its as cheap as I can get them. 35 each.

I'm just upgrading them, save the trouble of them going out a week after putting a ls6 manifold on. I guess like the saying says. You've got to pay to play.

Predator

That's DEFINITELY a smart move, and money well spent. You'd definitely have a problem with those '98 sensors, so you're saving yourself having to remove the intake again. Good smart move!

98A4LS1

iTrader: (1)

Just for clarification part no. 10456222 is the latest version for the 98's? I didn't think the later model year sensors would work becuase of a different connector.

I'm not 100% sure about this, just 99.9%, but the newer sensors screw in the same as the '98s, it's just that the wire connector is different, so you'd need to get a new wire with the new knock sensors.

KS: part #10456603
KS wiring harness: part #15372170

I'm confused. Which knock sensor should I buy 10456603 or 10456222 and why? What's the difference between the two?
Thanks!!

Predator

Get two #10456603.

People have had problems with '98 sensors causing a continuous 4* of knock retard. I'm not sure what all the differences are between the '98, and '99 and up sensors. I do know that the connectors at the sensor are different, that's why you need to replace the '98 wire with part #15372170.

Hope this is clear.

luv2spd

iTrader: (1)

You can also make them less sensitive through tuning like AnotherUser suggested.

Torqued

I believe the part no. for the harness has been updated to 12575869. GMPartsdirect and the local dealers can't reference the 15372170.

pekkaz

Are you guys sure the 98 PCM is compatible with the new type sensor ? Same frequencies etc. ?

Anyway, the 98 knock detection is POS. Just run the car with 30% toluene in the gas and quite conservative timing ... still the same knock. I'm going to delete knock retard

SmokingWS6

iTrader: (1)

I've ran 30* with no kr at times, go figure.

Anyway, the reason 98's are plagued with the 4*'s is due to the fact thats the max retard allowed by the 98 pcm. I know in later years they upped it to 6* or higher.

Torqued

I finally received the 12575869 harness from GMPartsdirect after 4 phreakin weeks and started tearing things apart. Pulled out the old knock sensors expecting to find 10456222 and to my displeasure they're stamped 10456603. WTF !!! I didn't think these sensors were put in 98's. Anyways I'm going to button things up and log some runs with the new "new" sensors...