How to replace knock sensor in 88 305 tbi firebird - Third Generation F-Body Message Boards

ramairetransam · 08-25-2009, 04:04 AM

Long story short my dad replaced the starter and broke the knock sensor. He bought a new one and now with the starter in he can't getthe old one out. It's a funny size and he can't find anything to fit it. Anyone have any help for him.

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NINÅ · 08-25-2009, 02:46 PM

Should be a 22mm.

However if the integral nut is deformed race shops have sockets with built in spring loaded pins that allow you to grip irregular/deformed nuts, then ejects the nut.

Great for pit-stop-repairs ► less socket changing.

Happy Racing!

If People Drove Any Slower They’d Be Going Backwards

Fog lights are not driving lights. They look dorky. Turn em off slow pokes.

How bout those dorks too scared to drive without headlights on in the daytime!

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regal301 · 08-25-2009, 03:51 PM

that should come out with the starter in place,use a long extension and as far as a socket to fit it ,find a 6 pt that almost fits and put the extension on and hit it with a hammer (not too hard) till it gets on the sensor and it should grab .

ALSO HAVE A BUCKET READY BECAUSE ITS GONNA DRAIN THE COOLANT FROM THE BLOCK !

1A Dan · 08-25-2009, 03:57 PM

Since its been on there for a while, hit it up with some penetrating oil (PB Blaster or similar). Sensors usually hate moving after being in place for a while and since its a bit of a pain to get out, I'd use any trick I could. 6-point is definitely the way to go since the nut is part of the housing and not quite as heavy duty as your standard bolt head.

18inchboyds · 09-04-2009, 10:11 PM

its not a 22 and its not a 21 and its not standard , does anyone have any more info , also what about taking the sensor and putting a resistor in place to fool the engine?? i know not totally safe but it will work , i hear 100 ohm . ??

regal301 · 09-04-2009, 10:43 PM

the resister is not a great idea,find a socket to fit the new one and then bang it over the old sensor,it will be a tight fit because the old one is rusty and or deformed or swollen.this is not the end of the world, you can drive the car without the sensor for a short period of time unless you hear pinging.