26/08/2026
Triple carbs look brilliantābut when several systems are working against each other, diagnosing a rough-running classic can get messy fast.
Dan brought his TE Cortina to Viking after the engine had been rebuilt elsewhere, but it was still difficult to start and running roughly.
During our initial diagnostics, we found:
š§ Low voltage reaching the ignition system, so we repaired the wiring to restore the full 12 volts
š§ A choke mechanism that hadnāt been installed or adjusted correctly
š§ An ongoing misfire that could be coming from the ignition system, fuel systemāor a combination of both
The Cortina now starts properly from cold, but the investigation isnāt over. The distributor system needs to be addressed first, then we can continue isolating the misfire. Damienās money is currently on the fuel system.
Weāre also considering replacing the triple-carb setup with a single carburettor supplied by the ownerābut first, we need to work through the overlapping faults properly rather than simply swapping parts and hoping for the best.
This is exactly where experience with older cars matters.
Most general mechanics are trained around modern vehicles and diagnostic systems. Classics donāt always give you a fault code or one obvious answer. They often have decades of repairs, modifications and mismatched systems layered togetherāand finding the real cause takes patience, methodical testing and genuine old-car knowledge.
Damien talks us through what weāve found so far and what happens next.
Weāll get to the bottom of it and get this cool old girl running properly again.
Got a classic, muscle car or hot rod with a problem nobody can seem to solve? Give Viking Hotrods a call on 02 4423 5851.