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Friday, March 24, 2017

Nissan Skyline ignition Coils - Missing Spring And/Or Contact Troubleshooting

RB26 ignition coil missing a spring. Idled and ran fine under low load. High load had a misfire
We recently had a Nissan Skyline GT-R that ran great at idle. Would pull smoothly through the gears, but at high rpm, and high load would break up.

The first thing we thought to check was the spark plugs, and ignition coils.  Since the idle was smooth at 1000 rpm, and it didn't sound like it had any vacuum leaks, this seemed the first spot to start troubleshooting.

When the coils came off, there was a bit of dirt/carbon on the coil packs and boots. Dirty coils can cause misfires. Electricity can conduct through the dirt and carbon build up.  We cleaned up the coils, boots, and added some dielectric grease to them.

Once we removed the boots from the coils, we noticed one missing contact. About 99% certain we had identified our issue, we put it back together to test. A short drive later, problem solved.

Lots of vehicle issues can be identified and fixed, with just some observation, and a little bit of work. From loose electrical connectors,loose grounds, broken solder joints, to small parts missing.  On vehicles over 25 years old, things will come up. Before randomly buying new parts, and replacing them, spend just a little time troubleshooting to at least narrow down the issue.

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