I’ve read that if there’s no compression on all cylinders then the car shouldn’t start. I did a compression test because the car vibrates when idle and in gear only, neutral makes it go away. Sometimes the engine would stumble and shutoff after quickly coming to a stop. Those issues started only a month or two ago.
Everything was followed for the compression test:
Disconnect fuel pump
Disconnect coil
Remove spark plugs
Screw in gauge
Hold pedal and turn starter 5-10 times
I’m thinking maybe it’s connected to the timing even though I re-did the timing thinking it was that originally.
If you’ve used that same gauge successfully for measuring compression, and are certain all cylinders register 25 psi or less, this is indeed a mystery. Any diagnostic codes there?
You either performed the compression test incorrectly, or the gauge has some kind of a defect, such as the “schrader valve” . . . which is actually a rather common problem
The engine won’t start with 0 compression on all cylinders
I solved the issue of the engine stumbling/shutoff when stopping quickly. A vacuum hose connected to one of the valve covers was 0.05" to 1" cracked upward from the base Looking at it it would not seem it would cause issues. I taped it with electrical tape. Another vacuum hose was not fully seated on so I made sure to push that all the way on. So that solved that as well as some of the vibration at idle in drive.
I went a different O’Reilly store and rented another compression tester and it worked.