4.3L in 77 GMC Sierra , Turbo 350 trans


Old 01-04-04, 12:26 PM
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4.3L in 77 GMC Sierra , Turbo 350 trans

Still working on 4.3L V6 which will not fire.... Can a wire that is too long cause a decrease in voltage when it reaches its destination ( similar to AC)?

The distributor is new, module passed the electronic test (3) times consecutively (AutoZone), installed new rotor button, cap and wires seem to be OK, firing order is 1-6-5-4-3-2..... The vehicle was cranking and I drove it 35 miles with the dist out of Chevy van mentioned below. After I installed supposedly correct distributor it will not budge.

Don't have a factory or aftermarket tach..... Is the coil to blame? Reading 11.88 volts to wire which goes to BAT side of dist cap.

The original engine in this truck was a 250 inline 6. Got the Vortec 4.3 L out of a 1992 Chevy Astro Van. Changed intake to 2BBl carbureted intake with distributor (vacuum advance) coil-in-cap.

All advice and responses are greatly appreciated; time to find the Tylenol.
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Old 01-04-04, 01:48 PM
Desi501's Avatar
Join Date: Oct 2003
Location: Boynton Beach Florida
Posts: 2,207
If you have 12 volts to the battery side then check for ground pulse on the tach side. If you have pulse there, the coil should be firing, if not you have a module or pick-up coil problem.

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