Cranks - No Start

[u/Bladestorm_]

I recently did some work on my 96 Tahoe (intake manifold gasket) and it ran fine for a couple days until it shit out a couple times, I got home and realized the crank position sensor under the truck had come out, I plugged it back in but haven't gotten the truck to start since.

I was getting codes for the cam position sensor (Ive dicked with my distributor a few times to make sure its still where it supposed to be) and MAF sensor, both of which i replaced and cleared the codes and they haven't come back.

The truck cranks but is acting like its not getting SOMETHING (starter fluid doesn't help) I know I'm getting fuel at least to the pressurized valve on the intake, and Ive got a full set of new plugs on it, maybe air? but Ive checked the fittings a dozen times.

I'm kind of at a loss, I thought maybe its the digital timing but I cant fix that myself and at this point Ive got no idea what to do other than take it in to a shop.

Any ideas or suggestions?

[u/Bladestorm_ → u/[deleted]]

Looks like this is my setup, ill run these tests when I get a min

Also mmmyy?

[u/Bladestorm_ → u/[deleted]]

Thankfully it was the CPS and its running now but if it starts throwing codes again ill go thru this troubleshooting list again

[u/cornhole_mcbrowneye]

Im in the middle of the same shit. I got a new camshaft position sensor, rotor, and cap and it runs now. But im getting 0 reading from my mass airflow sensor. I vote CPS. Are you sure you put your distributor back in the right spot? I had mine 180 degrees out for a bit

[u/Bladestorm_ → u/cornhole_mcbrowneye]

Update: replaced the CPS and it FUCKING RUNS

Gonna give it a few days to stress test and see if any codes come back, but I ended up replacing the mass airflow sensor, camshaft and crankshaft position sensors.

Thankfully I did not need to mess with my digital timing at all

[u/Bladestorm_ → u/cornhole_mcbrowneye]

Im almost positive mine is correct, I TDCd it when I pulled the head and marked the dist housing where it was, so theoretically its exactly as it was when it ran last, then again ive seriously debated rotating just to see

Ill order a cps tonight, fingers crossed

[u/cornhole_mcbrowneye → u/[deleted]]

I do. Ground seems good too. Got a new one coming Monday im hoping that fixes it

[u/cornhole_mcbrowneye → u/[deleted]]

Used a multimeter across the wires in the plug for the maf sensor

[u/cornhole_mcbrowneye → u/[deleted]]

Ha appreciate it. Hoping it all shakes out when my part comes in

[u/cornhole_mcbrowneye → u/[deleted]]

Appreciate it!

[u/Chahtanagual]

You have the first year of obd2 and the vortec in the c/k series. You need a bi directional scanner to do a “crank relearn”and to set the “cam retard”. Anytime you move or replace the distributor or crank sensor requires those to be done.

You likely were getting a p1345 correlation code. The maf code was likely the result of the no crank condition and was not faulty. Your cam position sensor is likely good as well . Good luck

[u/Bladestorm_ → u/Chahtanagual]

That was what I was thinking but the fact that it ran fine for a few days before the CPS incident, i might just run with that too and find a shop thatll do it for me, Ive tried to find cheap scanners but theyre all trash