What Causes a Distributor Cap to Corrode

The second reason is that the alternator overcharges the battery system. It then produces battery acid that may build up inside the distributor cap, causing corrosion. Finally, the wires may be porous and attract water into the distributor cap. This may lead to corrosion.

What makes distributor cap go bad?

The Problem with Carbon This usually happens very slowly and will continue to build up over time. The carbon conducts electricity, which can cause a misfire to the wrong plug or arcing between several plugs at once. By keeping the cap clean and looking for damage during engine maintenance, the cap will last longer.

What are the symptoms of bad distributor cap?

• Trouble Starting. As the distributor cap gets worse, you are going to have trouble starting the engine. …
• Shaking. If you are experiencing intense vibrations or shaking in your car, it could be due to the distributor cap causing misfires. …
• Stalling. …
• Squealing Noises. …
• Check Engine Light.