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Knock sensor? #462012 06/09/04 11:39 PM
Joined: Feb 2004
Posts: 396
Salem, Oregon
Ganoid Offline OP
Mudrunner
Any one know how to test a knock sensor?

My dummy light came on and when I checked the code it said 52 (knock sensor). I pulled the EFI fuse to reset and then went for a drive and sure enough it came on again for the same reason. I checked the wire (wire was new a month ago) and it seems fine but the FSM has no information on checking a knock sensor that I can find. Im not really looking forward to changing the knock sensor but I guess it would give me a chance to check and adjust my valves after getting the heads and cams seated in. Any one have any ideas for testing it prior to pulling it apart?

90 Xcab V6
3.0 Rebuilt/Balanced
P/P w/OS valves
Downey Hdrs,Jacobs Ign
5.29's,Tru Trac+Lockright
4"TG SAS+Rear Kit on 35's
(DOA Racing = $1200 lesson <img src="/forums/images/graemlins/angry.gif" alt="" />)
www.performancecylinderheads.com
Re: Knock sensor? [Re: Ganoid] #462013 06/10/04 09:00 AM
Joined: Apr 2002
Posts: 3,568
Grass Valley, CA
Snowtoy Offline
Roll Me Over
If you didn't replace the knock sensor when you put the heads on, then it is now probably bad. Every shop and dealer I talked to all said to replace both the sensor and the wire. For some reason they fail after removing the heads, the dealer mentioned somethingh about the heat they are exposed to. You wouldn't think that the sensor would go bad just from removing the heads (unless when you remove the wire something inside the sensor breaks). The dealer mentioned that they would usually get the trucks back within a month after doing head work, if they didn't replace both the knock sensor and the wire.

If you test yours and it is bad, the cheapest place I found one was at Butler Toyota in Indianapolis(1-800-692-6396), it cost me 127.50 shipped to my door(no shipping charges on oreders over $100).<img src="/forums/images/graemlins/cheers.gif" alt="" />

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
Re: Knock sensor? [Re: Snowtoy] #462014 06/10/04 03:06 PM
Joined: Oct 2003
Posts: 312
Pac Northwest
MrWiretender Offline
Mudrunner
Great! My rebuild project just went over the $2k mark. <img src="/forums/images/graemlins/shiner.gif" alt="" />

'87 22RE
Re: Knock sensor? [Re: Snowtoy] #462015 06/12/04 12:54 AM
Anonymous
Unregistered
Quote
If you didn't replace the knock sensor when you put the heads on, then it is now probably bad. Every shop and dealer I talked to all said to replace both the sensor and the wire. For some reason they fail after removing the heads, the dealer mentioned somethingh about the heat they are exposed to. You wouldn't think that the sensor would go bad just from removing the heads (unless when you remove the wire something inside the sensor breaks). The dealer mentioned that they would usually get the trucks back within a month after doing head work, if they didn't replace both the knock sensor and the wire.

If you test yours and it is bad, the cheapest place I found one was at Butler Toyota in Indianapolis(1-800-692-6396), it cost me 127.50 shipped to my door(no shipping charges on oreders over $100).<img src="/forums/images/graemlins/cheers.gif" alt="" />

When we used to do the 3.0 recalls, we always replaced the KS! If not it wasn't soon after that the CE would illuminate with a KS code! So, When replacing the HG's..! Always,Always replace the KS and the wiring if not, the CE light will tell you that you should have! <img src="/forums/images/graemlins/shame.gif" alt="" />

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