Cam and crank sensor issue on cat motor

Ok dig into it first thing this morning and printed all the documents the first fella gave me. Checked all resistance just to make sure none of the wires in harness were broken or touching. All is good there. Checked resistance at plug for both wires on crank sensor.Test came back with spec checked positive and negative leads as well to make sure they weren’t cross. Next I moved on to camshaft pins at the computer plug and meter not picking up anything. I’m like wtf. So I pulled plug off my new camshaft sensor and check the leads from plug to computer. Getting good readings from both wires and they aren’t crossed. Check my New sensor for the hell of it and low and behold, not picking up any ohms so my new sensor took a dump some how. Gonna go pick up a new one and maybe it was a fluke but I’m baffled. Like I said, truck started great for like 4 days before sensor went out

 

Nothing wrong with either sensor now. And nothing wrong with any of the wiring and still having the weird starting. Just for the hell of it today, I unplugged the crank sensor and started the truck. Left the cam sensor plugged in. Now that I did that, the truck starts normal and runs perfect. Started it several times and fires right up. So where do we go with this? I have half a mind to leave it unplugged till I get the truck inspected. I thought the crank sensor assisted in starting and determining crank position yada yada.

 

I only had the truck a year and it’s always started funny like that. Some days every now and then it would start normal. I pull 73 thousand pounds all day long all season and it never skips a beat. Season a little slow so I’m trying to care of things on the truck now that I have time. Fixed wires going to both sensors and checked everything at the computer harness pins. Installed 2 new sensors. I was messing around with it today and for the hell of it I decided to crank it over with crank sensors unplugged and it starts like a cat should

 

Interesting. Yeah it’s a nuisance. Cat put a new computer in the truck when I got it and told them to look into but I don’t know. When I started working on this issue, I replaced both sensors. Truck still acres same way, so then I looked into the nasty wires and found that they were all exposed inside the harness from decay and oil. Plus all the wires were green from corrosion. Replaced all the wiring that was damaged. Got in the truck and truck started normal. I thought I fixed the problem. Started normal for 5 days or so. Then the other day it was back to acting weird. Maybe the new crank sensor got week from shorting out and then died a day a few days later after I repaired the harness? I checked the ohms. It’s getting proper spec. Is it possible to get proper ohms and sensor still be bad? Sensor obviously making truck act silly when it’s plugged in so the computer knows it’s there. Cam sensor is good becuase truck runs on it by itself. If I do the opposite, plug the crank in and unplug the cam, truck dies immediately. Will not run on crank sensor alone. Maybe bite the bullet and buy another crank sensor huh.

 

Ok I gotcha. I’ll see if I can look up in there and see anything