North American Turbocoupe Organization



Knock sensor
Superman1307 Offline
Junior Member
#1
Does anyone know if any other knock sensor will work for my 88TC mine is bad and can't find any new ones for sale anywhere and I have no TC's in my local parts yard to pull from. any help would be greatly appreciated.
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Pete D Offline
Administrator
#2
What makes you think it is bad? They seldom fail. Is it pulling timing when you don't hear detonation? They can react to things like valve train noise, for example
Pete Dunham


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Superman1307 Offline
Junior Member
#3
My mechanic says it is. Not sure exactly what is making it bad, he just got done rebuilding my motor and is trouble shooting little issues that are keeping it from running its best. He fixed a vacuum leak that was kepping it from building boost and now says it is clattering under boost. Any help would be awesome.
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Pete D Offline
Administrator
#4
The knock sensor only causes the EEC to pull out timing to stop it from cackling, but there are limits. Some of us disconnect the KS to avoid it pulling timing when there is no detonation. We don't recommend anybody do this and certainly until they know what actual knock sounds like and don't boost it with the radio up. It can lead to blown head gaskets and worse (much worse)

Whatis needed is to find the root cause of the problem, why it's clattering (cam timing, ignition timing, air leak or fuel delivery problem like a bad pump or regulator or clogged fuel filter among others.
Pete Dunham


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Superman1307 Offline
Junior Member
#5
Thanks I will get with him tomorrow to double check that stuff, but just incase I do have a bad knock sensor is there another one that will work for our cars?
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Jeff K Offline
Administrator
#6
Knock sensors are engine specific. They are tuned to detect a specific, narrow range of frequencies characteristic of a specific engines detonation. In other words, a random KS from another engine wont work right even if physically fits. Dont quite me on this, but I seem to remember the 2.3T KS is tuned to detect 2800 Hz.

If your mechanic ran the KOER self test and didnt bang on the intake with a wrench, etc at the dynamic response code, the EEC will throw a code 25 for the KS. As Pete said, they VERY rarely fail.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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