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Where is the Knock sensor?

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Old Nov 14, 2008 | 06:53 PM
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Default Where is the Knock sensor?

Seems from the post I've read these two sensors should be replaced on any older car.I know what they look like I just can't find them. My car is a 1989 S4 auto. Also where is the Temp II sensors? Is that on the intake right in the front?Thanks for any help.
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Old Nov 14, 2008 | 06:57 PM
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The 2 knock sensors are bolted in the 'V' of the block under the intake. You have to remove the intake to replace them.

Temp II sensor is the unit on top of the waterbridge in front of the intake.

Last edited by the flyin' scotsman; Nov 14, 2008 at 07:20 PM. Reason: correction
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Old Nov 14, 2008 | 06:57 PM
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its under the intake manifold

in order to get to it you must remove the manifold, injectors, fuel rails and so on and so forth.
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Old Nov 14, 2008 | 07:03 PM
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OK ..."Down in the valley, valley so low
Hang your head over, hear the train blow ..." as noted buried under the intake with lots of other parts to refresh.
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Old Nov 14, 2008 | 07:04 PM
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Temp sensor II is on the water bridge in front of the intake manifold. The switch on top of the manifold is for post-run fan operation to limit intake temps during hot-soak conditions.
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Old Nov 14, 2008 | 07:19 PM
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thx Bob, you are quite correct.............edited my post.
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Old Nov 14, 2008 | 07:24 PM
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What is it? http://members.rennlist.org/v1uhoh/underthe.htm

Intake how to: http://928oc.org/journal/intake1b.pdf
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Old Nov 14, 2008 | 08:29 PM
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Default Thank you

Sure having a lot of fun working on this car.
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Old Nov 14, 2008 | 08:49 PM
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Originally Posted by Xvetteowner
Sure having a lot of fun working on this car.
I hope that your statement was without sarcasim....There are often lots of opportunities to have fun
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Old Nov 14, 2008 | 09:00 PM
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there are 2 temp sensors on the water bridge, the one with the bosch/AMP connector is the temp 2 .
the other one with the male ends is for the coolant gauge on the dash
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Old Nov 14, 2008 | 09:10 PM
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Thumbs up No Sarcasim here, 30 year plus in the hobby.

Just sold my 2005 Maserati coupe, Been to hell and back with that car. Would pop the hood look around then close the hood since nothing there made and sense. Call the dealer to ask "What could that XXXX be" "Not sure take it in, Next opening in two weeks And by the way I wouldn't drive it since you don't want to get stuck" Two weeks later I get the car in, Next day " Bad ground thats why the temp light came on. Two and a half weeks of prime summer time driving wasted. I got three more stories just like this. How nice to not only have a car I can work on but a website with so many smart people to learn from.
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Old Nov 14, 2008 | 09:11 PM
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Originally Posted by Mrmerlin
...the other one with the male ends is for the coolant gauge on the dash
Speaking of which - that's a VDO sender. Does anyone know either

a) the VD0 part number

or

b) the specs for testing it's goodness?

"B" is what I'm after, but with A, B might fall to the mighty google.
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Old Nov 15, 2008 | 06:41 AM
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Hi Dave
Look at the doc "diagnosis of the instrument cluster" Technik Info '89, WKD 495 821 page 9.

That gives the resistance values at various temps.



Originally Posted by worf928
Speaking of which - that's a VDO sender. Does anyone know either

a) the VD0 part number

or

b) the specs for testing it's goodness?

"B" is what I'm after, but with A, B might fall to the mighty google.
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Old Nov 15, 2008 | 11:50 AM
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Originally Posted by Xvetteowner
Just Bad ground thats why the temp light came on. Two and a half weeks of prime summer time driving wasted. I got three more stories just like this. How nice to not only have a car I can work on but a website with so many smart people to learn from.
Well, this car never has any ground problems.

Yeah, that was sarcasm, BUT you have friends here that can and will help and sharks are special, not that a Maserati isn't.
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Old Nov 15, 2008 | 12:06 PM
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I'd never looked at that book before John; another gem buried in all of Jim's CDs............thanks.
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