I've been feeling down on power for a while now, and especially low end torque. Just did new NGK plats and a new fuel filter. Also have highflow panel Airfilter which IS clean. My engine is throwing no codes (ECU check showed 0505 two weeks ago, and again today). I've read about KS going, but not gone enough to throw a code, or just intermittenly gone so I grabbed my impedance meter to check it out. I tested from the front most wire in the plug (after unplugging, obviously) and grounded at the neg. battery terminal. My impedance meter didn't budge! I also tried testing between the two wires in the connector, still no results. I thought it must be my meter, so I tried one I borrowed from O'Reilly and used in the parking lot. It also did not register anything and it was a digital. Am I doing this wrong??? I would hate to replace such an expensive part for no reason. Any ideas?

 

I tried testing my resistance tonight as well. I could not get a good reading. I just am not good with voltmeters.

 

Anyone else have any advice?

 

If you didn't get a reading than it's abviously dead. We just replaces a buddy's KS and had no reading, took it out and it was cracked in 4 places. Which connector did you test, the one coming from under the intake manifold or the one that one plugs into? Disconnect the harness from the KS and drive like that for a few days to see if you notice a difference.

 

Is it OK to just disconnect it??? I've heard of connecting a 550 Ohm resistor to see if you notice gains, but I haven't heard of driving with it disconnected. I assume the computer will just go into "safe mode" since it doesn't sense the KS???

 

Yeah, it's just go to safe mode. If your KS is already bad you are curently running safe mode anyway so what's the difference? If the KS is good, then you should notice a difference in performance.

 

I had a quick question, wont the ecu have to throw a invisble code at least? Or would you have to test it with a meter?

 

Because the plastic is cracked means nothing its just a cover . . Do me a favor and check something if you can . Reach under your intake and unplug the knock sensor itself . Then put one meter lead on the left terminal in the knock sensor itself and your other lead on a good engine ground . Post your readings . Then check for continity of the sub-harness itself and post your readings . Lets just say Im curious .

 

I have the Ghost code in my car right now. I Get really bad gas MILe. SInce I have the Code I am putting 89 Octane gas. Its no point for me until I change the knock sensor.

 

I wish I could agree with you about the cracked plastic but I won't. Simply cause it's not true. Withe the cracked case the sensitivity of the KS is totally out of whack which renders the KS useless.

 

Thanks! I think I'll try this tommorow. I will be taking a trip, about 200 mi. round trip, on mostly rural 2-lane highways. Should be a great chance to see if there's a difference.

 

Well, I tried the unplug today. It seemed a bit down on power, but not nearly as dramatic as everyone said. Just as always, it's not too exciting until after 3500 RPM, and then power comes on until about 6000. I also re-tested my KS impedance with a different meter, and got 512 ohms. Does it sound like I have a bad knock sensor that's just coming and going, and not yet fully gone? I'd hate to drop over $100 dollars and gain nothing. Any clues?

 

yeah get a new one, just because the resistance value is within spec doesn't mean it fully works.