wrote: 1986 Chevy C10 pickup 305
It suddenly quit running. I replaced filters, cap, rotor and ignition module. It is getting fire to the plugs and the carb is getting gas. It wants to start but but won't. When I set the #1 piston to TDC the rotor is pointing at #3. The timing chain mark meets the mark on the bal wheel ok. Is there something I am missing? ________________________________________________
When it quit, was it like the ignition was shut off or like it starved for gas? Did it make any sound or vibration? How do you know it wants to start? Does it run then quit, or backfire, or do nothing but crank without firing? Turn the engine over one more time until it reaches TDC again. To time the distributor, the #1 cyl must be at the compression stroke TDC, not the exhaust stroke TDC. Check for a broken coil resistor. When the coil resistor breaks, the engine quits. Then when you turn the key to the START position the engine fires and starts running but when you release the key to the RUN position it quits again. Good luck. Rodan. __________________________________________________
When it quit, there was no noise or vibration, just died like the ignition was shut off.
The eng tries to start, shows some back pressure through the carb, quits and tries to restart.
The coil is built into the distributor cap. The plugs are firing. I checked them.
It did the same thing before I replaced the dist and rotor. _______________________________________________________
Then it gets back to timing: Timing chain slipped, Distributor clamp bolt loose, Distributor gear shear pin broken. To time the distributor, the #1 cyl must be at the compression stroke TDC, not the exhaust stroke TDC.
From the carb backpressure I would think of a burned valve or a collapsed exhaust pipe, but these conditions should not result in such a sudden shutdown. Another possible condition: carb fuel input fitting mostly plugged or carb needle valve sticking almost closed.
I hope you will post again when you find the problem.
Good luck.
Rodan.