My son and I recently rebuilt the 5.7 vortec in his 1997 chevy silverado. It had rod bearing issues and we replaced the bottom end. It is now back in the truck and we reconnected everything and started it yesterday. It sounds good and runs well except it seems to have a timing or fuel issue, perhaps a vacuum leak. I sprayed carb cleaner around the intake when running and it did not change anything.
There is a fault code available and we will be trying to get an OBD2 reader today.
I have a question about the spark timing. I am old and I’m used to timing lights and such. For this project, we followed a manual for the 5.7 and set the #1 cylinder at TDC on the firing stroke and then set the rotor to the “8” printed on the distributor housing, just like the manual shows (not sure if this is deg of advance or what). I rechecked it once the whole thing was together in the vehicle and found that the balancer and timing tab are nearly impossible to see if the vehicle is running.
With the thing running like it is, I do not know how to check timing while it is running. Is there anything I can do here other than check fault codes?