ollie32

My dads truck quit yesterday, turns out out the fault was the crankcase position sensor.

Has anyone had any experience with this issue?

Cheers

johnh

i know of a crankshaft position sensor,
or a camshaft position sensor,
but not a crankcase position sensor

lovinCTD59

Usually the symptoms of the crank sensor failing will start to show up slowly. But its not unheard of that it can just fail at any time and shut itself down. (Computer cant "communicate" with the engine itself.)

Dinner

yea, I believe mine is starting to go as well. My rpm's on the tach jump around once in awhile and while cruising, you can accelerate from 1800rpm lets say, gain speed, and then all a sudden the tach will jump like 200rpm, wont rise slowly or accurately.(only under slow acceleration)

As lovinCTD59 said, if the cam sensor goes...there is no signal telling the computer that the engine is turning over. And so the computer "see's" that there is no rpm, engine movement, and so the computer thinks the engine is not running. So then the truck will just shut down due to the computer shutting down.

gmctd

Loosen the CPS - raise it up a little - put a credit card between it and the HB - push it down against the cc - tighten it back up - remove the cc and yer good to go.

If yer significant other is a compulsive spender, disregard the last step, crank the engine, and protest innocently regarding the outcome.

BTW - the crankcase position sensor is on either side of yer nose - horizontal is not good............

Totallyrad

Don't forget to check the wiring harness attached to the sensor. Chaffed wires in that harness grounding out to the engine will act just like a bad sensor.

JyRO

How do you get that sucker out? I've got the starter off and out of the way. I've got the bracket off the sensor. But I can't get that sensor out of the hole. I need help.

The truck is down and out until I can get the sensor out. I've got the new sensor sitting there waiting to go back in. HELP!

- JyRO

Mike Perez

I just replaced mine, I WIGGLED, ROTATED and LIFTED. Get some leverage with a flat screwdriver under the mating serface - only a o-ring holds it after you remove the bolt. The sensor dose not contact anything inside.
Good luck, MP

JyRO

Well, I managed to break the sensor's connector. I did get it to rotate fairly freely with WD-40. Before I rolled out from under the truck last night, I hit it with the WD-40 again.

Tonight I'm going to use the dremel and dremel a groove at each corner of the sensor body (the sensor body down in the block is round, but outside the block it's square) where the sensor body meets the block. Then I'm going to put some safety wire in there and pull it tight around the sensor, held in place by the notches.

Then more safety wire attaching to the corner captured safety wire. Then I'll be able to pull it axially ... and it should come on out. Hopefully.

If not, I'm willing to provide the beer of your choice, plus pay your fuel, plus a bit of a cash money reward, and and free dinner (up to $3 ) for anybody who can come to my house and learn me how it's done. Seriously, I may need some help ... I'll let you guys know. My offer above (sans the attempt at humor) will stand.

vzdude

Whoa! Get a slide hammer like the kind used for small dents. Put a 3" drywall screw in it and slide hammer it out. Screw the screw in about an 1" to 1.5". I've had some pretty stuck and that was the only way to get them out! Really works slick! Extra lube probably won't get to the oring area with all the rust and such that gets caked in what little clearance they give it to begin with! Never hurts though!

JyRO

vzdude - You reckon there's enough room for a slide hammer? I don't know what they look for, but get the jist of what it is. Kind of like the opposite of a fence post slide hammer (don't know what that's called either) but it drives hollow fence posts into the ground.

I did a lot of motorcycle racing back in the late 90's, and spent a fair amount of time burning leather against asphault, and ensuring the effectiveness of helmets. I think those experiences have effected my memory ... and my ability to remove sensors.

ozob nospej

No Jyro,
A a fellow motorcycle race junkie, I can tell you that you must be BORN with sensor removing ability, or you will just have to suffer with the rest of us! Now as to memory, it really depends on how many times you bounce-tested that helmet

JyRO

What helmet are you talking about?