P0336 is the crank pos sensor, its not reading correctly. Pull the crank pulley off and check out the ring, make sure all the teeth are there and its not dirty. Also check the wiring to the sensor and make sure its in good shape.

P0372 is the high timing pulse. Basically the pcm can't tell if the timing is right because of either the crank sensor or cam sensor. (This will also affect the fuel delivery)

P0102 is mass air flow circuit low. Basically the pcm is getting a low signal from the maf. This could be caused by a bad sensor, dirty sensor, a major blockage in the intake system pre maf, loose or frayed wiring, or no power to the sensor. A bad or unplugged maf can and will keep the car from running.

P0410 is the secondary air injection system. This is a pump that forces fresh air into the exhaust to reduce emissions (its the steel lines that run to the top of the exhaust manifolds) this will defiantly not keep the car from running.

 

p0336 crank sensor is not working correctly, it is used to monitor the system so if it fails it will not on its own cause a no run condition. could be bad connection, bad wire, bad crank sensor. p0372 check the connections at the opti, check the plug pins to make sure they are ok. also check connections at the harness. follow the opti wire harness up and half way along theres another plug, check the plug connection there. p0102 maf https://camaroforums.com/forum/93-02...ing-maf-63856/ OBD-II Trouble Code: P0102 Mass Air Flow (MAF) Circuit Low Input p0410 is air/emission pump, deal with the 102 first.

 

ok i will let him see this and go from there thank you very much. also what is the ECT thing what does that mean

 

engine coolant temperature (ect) sensor. and if its failing it can cause poor to no run condition.

 

the car fires up and runs rough but it smooths out. smokes a light white blue from the exhaust. let it run for 30 seconds shut it off and it wont fire back up and this was just done. it will always fire up the first time after it sits but not after we shut it off. could a dirty fuel filter cause the motor to run lean???? he said it is getting fuel to the rail.

 

he said he can put his hand on the throttle body, full choke and hold the butterflies open and it fires. rough run but smooths out and idles fine.

 

test the ect to see what temp it is seeing using a ohm meter. here is directions and a graph to tell you what ohms = what temp 4th Gen LT1 F-body Tech Articles my truck was doing a similar thing and the ect was seeing -40 degrees

 

is there any way you could point me in the direction of an emmision system diagram? he cant remembr where all the vacuum hoses go.lol

 

link at number 15 on the list here https://camaroforums.com/forum/93-02...o-specs-71052/

 

I would investigate all of these in the order listed here. Fixing the crank sensor issue may fix both the first and second trouble codes and likely has a lot to do with the car not starting up all of the time. May want to check the ECT too as craby said. then the maf is simple follow the instructions craby posted and then move on to the P0410.

I would scan for codes again and just post a list of them all on here. It is important we know all of them.

If you have a scan tool that can display live data I would watch it when the car is running and while you are trying to crank the car when it will not start. The scan tool will tell what the ECT is telling the computer as far as coolant temp and when the car will not start, crank it over and watch the rpm reading on the live data. Sometimes if there is a fault with the crank sensor or its circuit it will not display a reading while cranking. I would also test both manually, with a multimeter.