how to get to knock sensor
 

so it looks like I need to get to the knock sensor to test it... is it necessary to remove the upper intake manifold to get to it? certainly is in an inconvenient place :(

1994 5.0L btw

heh? it should be in the side of the block....you sure you're talking about the knock sensor?

if in fact it is in the intake....move it to the side of the block...valve train noise can set it off and retard timing prematurely

I asked about the upper intake because it seems to be sort of underneath it, sandwiched between the back of the block and the firewall, really hard for me to reach with my big ol hands :(

google really is amazing ;) The arrow points right to it on the back side of the engine. Not my pic, and I can't tell you how to get it out either - but now you know where to reach

http://www.ford-trucks.com/forums/pi...ictureid=16094

I saw that pic, but I don't know for sure that's the same engine and I could still use hints on how to get at the thing

that pic was from another Frod truck forum and they said its a 302, so I'm going with it. It looks like a tight fit, but with a little work and a few choice words I bet you can get it out. :)

choice words indeed, going to be a fun afternoon then :|

Start by cleaning & inspecting connector & wires. Knock sensors themselves are pretty bullet proof.

From the pic, looks like a correct size plug socket, extension & ratchet. Or a variation thereof.

just unplug it and be done with it....

if it rattles back out of the throttle...

why have a safety device do something you should be doing anyhow...

and FYI if its bad good luck finding a replacement...none of the stores here carry them anymore

stolenphoto I just noticed you're in kettering, you're probably only 30-40 mins from me

well, by some enormous coincidence the check engine light just came on on my other car (2000 honda civic) so I got the codes read, guess what ails the car...


... that's right, code P0325: knock sensor malfunction :(

so I get a little practice on these stupid knock sensors, hopefully it's in a less stupid place than the one on the truck

honestly man....

really test the sensor and make sure it's the sensor that malfunctions...

other things can cause the sensor to trip a light, even other sensors...

Knock sensors work off the ground...meaning if it test malfunctions its not sensing a ground at all...ohms test it to ground unplugged...

then tap the block lightly with a hammer or wrench and the ohms should jump one way or the other...

its like the same way a vacuum leak will cause a MAP sensor to trip or the O2 to go Lean or Rich depending how it reads...you can get two malfunctioning sensors just off a simple vacuum leak...

dont ever just assume a sensor is bad....check the voltages running if you can to see if they are in range and even if they are in the low range that can mean a loose ground somewhere not making full contact. All sensors fed off that ground will read low...or spike high

im pretty sure what the arrow is pointing to is the oil pressure sensor. just my .02 replaced on my 250 once. pain in the ass

Either remove intake or transmission...ur choice.

I know the sensor isn't necessarily bad, but it's still a pain to get to it to test it