Hectorm

(GS 400 -2000) The scanner say both are bad... (I'm not completely sure) One mechanic told me the intake manifold have to be removed. This involve a lot of work. Is similar to change the starter...
any idea...? Want to do myself

See the post "me car doesn't run as before"

lxgs4

yes the intake manifold needs to be removed to access the knock sensors. If you are DIYer then it shouldn't be a hard thing to do. Just make sure nothing falls down into the intake and double check before you put it all back together. Nothing worse than having something fall in and bend some valves

Hectorm

Many thanks for the advice!

Och

iTrader: (3)

Knock sensors usually dont go bad at all, and especially both of them.

DoWnAqT

sounds like a mouse made a nest in the valley and chewed the wires.....GL

TRD911

I remember a long time ago we used to tap on them with a screw driver and the idle would slow down (retard). Is that still a valid way to test these?

BP

PushinLEX

iTrader: (9)

as long as your running premium and not crap gas your knock sensors should be fine

Hectorm

Also I posted: my car doesn't run as before...

Finally find the culprit. See the pictures. WOW
Also the vacuum hoses was ate.
Very close to catch in fire... lucky me it didn't!

Labor to fix: $250 plus $40 in new plugs and wires.
Forgot to take pictures when fix was made

Hectorm

Intake upside down

Hectorm

close look of the intake

Hectorm

Lucky me. https://www.clublexus.com/forums/ima...s/thumbsup.gif

macd7919

iTrader: (10)

Ummm...that doesn't have anything to do with the knock sensors going bad.
Glad you found your issue though!