Re: Weird Surging

Posted by TxGoat On 2024/2/23 11:05:42

A hairline crack or internal carbon track in a distributor cap or rotor can cause hard to trace issues.

Supression-type plug wires can look like new and still fail to function properly, usually evident when the engine is loaded.

Spark plug boots can carbonize and allow the current to jump to the plug base, especially if the boots are pushed too far down over the plug insulator. Any accumulation of carbon or other matter on the spark plug insulator can cause "flashover", which usually shows up when the engine is loaded. A very slight exhaust leak at the manifold can soot up a spark plug or damage a boot. A weak ignition coil or one with compromised insulation can cause surging under load.

Problems with an ignition resistor, if present, or a lack of one, originally equipped, can cause surge or stumble problems.