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Old 08-21-2010, 06:49 AM
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Knock Sensor

The owner of a 1987 chevy 5.7 engine is back again with his fustrating dilimma of the evil knock sensor that is still frozen in my block. The only material left from the sensor is about a little under 1/2 inch of thread. Instead of trying to chisil out what is left is there any hope of moving the sensor to another part of the engine? Isn't there a plug on the opposite side of the engine that the sensor would screw right into? Give me some advise ya'all. One dude wants me to weld a bolt or some sort of lug to the left over thread, but I am not sure if I can get a good weld on it. Then I thought about useing my dremel tool to drill a hole, but it be my luck to bust the bit off. Is there any place on the intake manifold I could maybe put the sensor? My headers are hogging allot of space up, they also make things difficult. My buddy said about 11;00 am will give it another go. Your advise would be welcoming.

Tommy

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Old 08-21-2010, 06:54 AM
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You can use the other side of block but, that plug may be just as stuck/froze as the Knock sensor. You would have to extend the wire to reach.
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Old 08-21-2010, 04:50 PM
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If it's that much trouble just get another block of craigslist in good condition. But please thouroghly inspec it before you buy.
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Old 08-21-2010, 05:02 PM
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Welding the nut to whats left of the sensor in the block is really your best bet to get it out. when it cools enough that the red dissapears you should be able to turn it loose as the heat from welding should move the molecules around fast enough to loosen the piece . That DUDE had the right idea.you should thank him
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Old 08-21-2010, 06:29 PM
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temporary success

As I told ya'all I would be attempting to move the knock sensor to the other side of my engine. To make a long story short the plug screwed out with amazing ease. I screwed the new sensor into its place, re-wired it and thought everything was good to go. The engine idle is high I have fuel injection. Test drove the vehicle up a steep incline and the engine just wouldn't pull the hill. When I floored the accelarator I had no power and the engine trouble light came on. What kind of sign is my engine telling me? About a week ago the dealership diagnosed my engine to have a intake manifold leak. Do you think the way my performance is being effected could be a direct cause of the manifold leak? Well I guess its back to checking for vaccum leaks. Is it easy to over look a leak? I have used propane, starter fluid wd-40 and carb cleaner to track the leak. I think I will try soapy water. It seems to me it would be easy to spot rather than to hear a different variation in the engine idle. All suggestion on my new problem would be appreciated.
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Old 08-21-2010, 07:02 PM
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pull the trouble code from the ecm and go from there.If it has an intake leak you will have a lean code.this very well could be your problem.Hi idle speed also is a good indication. The idle air counts should be around 20 or 25 ( if you have live data scanner) if it is at 0 it is trying to compensate for the leak.
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