Fighting P0330 in a 2000 RX300

[BLSTIC]

Knock sensor codes come in two varieties
Knock when none expected
No knock when expected

Also, as the knock sensor generates its own voltage, very little current flows through the wiring and it's extremely susceptible to noise. Make sure the shielding is intact and grounded properly

[Natalya]

Found water leak, it's where I thought it would be, tube going to heater core at the firewall. Waiting until engine cools then I'm going to have at it.

[Natalya]

Fixed water leak. Rented a compression gauge from the auto parts store.

What all do I have to disconnect to make sure I don't damage the engine before I try testing it? Obviously the ignition coils will all be disconnected.

[Natalya]

Compression looked good on all cylinders, highest was 165 lowest was 152. Going to take apart the upper part of the car again to get back at the knock sensors. Will test for corrosion on the block and shorts within the sensors themselves.

Also, unless anyone thinks it's a bad idea, while I still have the spark plugs out maybe I can spray some carb cleaner down in them to loosen some buildup if there is any, but I kinda doubt its bad at this point.

[Daschicken]

Originally Posted by Natalya

Compression looked good on all cylinders, highest was 165 lowest was 152. Going to take apart the upper part of the car again to get back at the knock sensors. Will test for corrosion on the block and shorts within the sensors themselves.

Also, unless anyone thinks it's a bad idea, while I still have the spark plugs out maybe I can spray some carb cleaner down in them to loosen some buildup if there is any, but I kinda doubt its bad at this point.

Compression sounds fine.

If you are going to loosen buildup, make sure you get it all out. You don't want it coming out when the engine is running.

[Natalya]

Originally Posted by Daschicken

Compression sounds fine.

If you are going to loosen buildup, make sure you get it all out. You don't want it coming out when the engine is running.

Any tips on that? I've never done this before.

[Natalya]

Air intake chamber is removed once again. I used my multimeter to perform 2 tests on each knock sensor, both passed both tests. However, I think I'll replace them both anyway with new OEM ones and just eat the cost.

Anyway, before I do it, is it safe to spray carb cleaner into the cylinders through the spark plug tubes? Also the valves are exposed right now... is it safe to hit them with that stuff, or will it cause problems when I start the engine in a week when it's all put back together?