Timing check 350 5.7l Carb

[wryork25]

I saw a thread that made me confused and I am hoping to get some clarity. I was under the assumption that when checking the timing you were to ground the purple and white wire to get the ignition into base timing. The thread that I was reading said that you jump it to positive 12 volts? Is this correct or do I jump it to ground like I originally thought.

 

[Bondo]

Ayuh,...... Welcome Aboard,...... Is this the T-bolt IV ignition, or T-bolt V ignition,..??

Post the motor serial number if you don't know which ignition,...

 

[wryork25]

I am not currently at home to check serial number but I believe it is a T-bolt IV. The ECM is mounted to the dizzy and it only has one plug, and I do not have knock sensors.

 

[Bondo]

I am not currently at home to check serial number but I believe it is a T-bolt IV. The ECM is mounted to the dizzy and it only has one plug, and I do not have knock sensors.

Ayuh,...... No wires to mess with, with the T-bolt IV,....
Just point, 'n shoot with yer timing light,......

 

[wryork25]

I will check the serial number and get back with you. Now I am not sure because I have the shorting purple and white with a bullet fitting on the starboard side of my engine between the carb and manifold. This is one if the locations of a few that I read where this can be located. I assumed that it was where I connected to short to ground. Is there a version of the T-bolt V that only has one plug on the module? From what I read and pics I saw, they have two plug connections.

 

[Bondo]

The ECM is mounted to the dizzy and it only has one plug,

Ayuh,..... There should be printing on that module that says T-bolt IV,.....

 

[Scott Danforth]

TB IV uses a timing light and you set the motor to 6-8 degrees per the manual for your motor. No different than any generic distributor. No base timing mode. Just must be set at idle.

TB V needs to be put in base timing mode by grounding the purple/white wire, then adjust to what the manual states for your motor.