96 timing issue possibly

[chevyCowboy]

when I started my truck this morning it started normally and then within half a second. seemed like the timing changed and it was running almost like it had a knock. didn't have time to mess with it right away so when I got home from work I hooked up the computer and these are the codes that I got. there was a bunch

I cleared the codes and fired the truck up. everything seems to be fine now. not sure which one I should look at. first. I went to the live data metering and all the timing stuff looks right. the TDC offset is a little far if I remember right. it's like -1.94 or something is the desired

I have been having a issue with this truck doing A weird surge but it does. it. super randomly and it could be weeks in between times it does it. I was guessing it is something to do with the injection pump being worn, when I add tranny fluid to the fuel it seems to do it less.


The other day it did it and then started running similar to what it did this. I shut the truck off And restarted it and it was fine after that.

anyone have any thoughts on this? thanks

 

[dbrannon79]

I would start by cleaning your grounds for the PCM. look at the passenger side head on the intake near the trans dipstick tube. there should be three wires on eyelets bolted to a stud. make sure those have a good connection. also check the ground strap from the frame to the block along with the ground cable from the batteries to the body and block. to me it sounds like it's pulling a ground where ever it can due to a bad connection. could also be weak batteries and or a starter pulling too much to crank giving you low voltage during cranking.

start there and eliminate the easy stuff first.

 

[ak diesel driver]

TDCO is high should be a code for -2.02

 

[chevyCowboy]

TDCO is high should be a code for -2.02

I did a re learn and got -1.06 best I could get

 

[MrMarty51]

I did a re learn and got -1.06 best I could get

If You want higher the top of the injection pump needs to be rotated to the left, drivers, side of the vehicle.
Then do another relearn.

 

[Big T]

That Crankshaft Position Sensor (CPS) could be the root cause of your problems. They are cheap and relatively easy to replace.

 

[Will L.]

Do the alternating unplug/plug test with it and the optic sensor.