93 Taurus, Trouble Codes

i got a 93 taurus, 3.0 had taken the car to Auto Zone due to the check engine light coming on.... the codes are the following: 25 Knock Sensor, was told i dont have one in this car, i got the shop
manuals and could not find one listed 34 EVP voltage out of range.. i took the EVP off the car and brought it to auto zone and they checked it and put pressure on it and did a voltage test and it showed up OK.. 51 ECT sensor... i put a multimeter on it and in the 100,000 range got a reading of 50 ohms with the engine hot.... does this sound right???? if this is correct i wonder eventhough there is no code for a bad EGR coming up could the EGR be sticking???? as the ck. engine light comes on and off during driving??? thanks for any help.
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jim wrote:

If if otherwise runs OK, consider whether it could be the computer proper. Either in intermittent fault (it crashed, as computers can do, either because something external such as a power surge og EMI), or a permanent fault (computer is bad).
Try have it reset and see if fault codes reappear and are consistent with the present ones
Soren (not even a car owner, but a computer science grad :)
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Soren Kuula wrote:

thanks for the reply....
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With all due respect to a computer science grad from a lowly auto enthusiast (and an electronic engineer, but that's besides the point), the computer would be the last thing to suspect in your case. It has decent self-test capabilities and in the rare event when it fails so badly that it can't diagnose itself, you won't get any codes at all.
I am not familiar with your engine, so it's hard to give advice on your EGR problem. You mentioned an EVP, as if it were a position sensor on top the EGR valve. But if Autozone put pressure (or vacuum) to test it, it's a PFE (a pressure sensor), not an EVP. Assuming that they know what they are doing (which I would doubt), the failure may be in the EGR control solenoid. Or you may have carbon deposits in the valve, the EGR tube, or the passages, blocking the flow. Also check the pressure sensing tube connected to the sensor and make sure that it is not blocked and has no leaks.
50 Ohms is way too low for an ECT any any temperature. It should read something on the order of 2 KOhms with a warm engine. Before you run to replace it, make sure that you measured it properly. Was that an analog multimeter that you were using? You would not be able to read 50 Ohms with any accuracy on 100K scale with such instrument. Switch to a lower scale and repeat the measurement. And verify that the instrument reads zero with the probe leads shorted together.
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