started fine before, when it was really cold it would start choppy and i’d hold the throttle for it to clear up. now it’s no start, no cel, my tach isn’t reading the cranking rpms idk if that is normal. my shop teacher says no spark, check crank sensor, what do you guys think

 

Checking for spark would be the first thing I would do.

 

i just checked spark and all 4 cyclinders are getting spark with the same pattern, it’s not that strong but it’s there

 

If you do not have bright blue spark, the engine may not actually run. Consider a coil replacement (cheaper cost) although the problem with the tachometer is likely caused by a faulty ICM. Purchase the same brand as what came stock in the distributor... likely a TEC or Hitachi.

 

it still doesn’t start. it has spark and fuel. compression is pretty low in cyl 2, 90, while the others are 150. my next move i think is buying a new coil for it. lmk if you have any suggestions

 

also i cranked it with my foot to the floor just to try and that didn’t work

 

Why does it have low compression in all four cylinders ? If you did the compression test correctly, one cylinder will NOT run and the other three will be suspect.

 

not sure i’ve done a compression test before and all of the cylinders were 150 now cyl 2 is 90 but i was under the impression it should still run with those results

 

It may be VERY HARD to start with those compression numbers.