1986 Ford Fairmont Pricing and Specs

Even though the car isn’t moving, putting it in gear, does place some load on the engine. The rule of thumb is that a miss under load will be ignition related. These engines are well known for failing coil-packs which, essentially, provide the spark for the engine. If these aren’t operating correctly, a miss can certainly be one symptom.

But a better approach would be to have the car scanned electronically. At that point, the car’s own computer will very possibly throw up the answer to what ails it. That will save you a lot of time and money changing parts that were not the problem in the first place.

A faulty body computer is the most likely cause of this behaviour. It’s a common enough fault with this series of Ford Falcons and it often requires the body computer to be replaced as well as the ignition keys to be re-coded to the new computer. Unfortunately, it’s not a cheap fix, although you could try a second-hand computer from a wrecking yard. There’s every chance, though, that it could develop the same problem sometime in the future.

Sometimes, the codes spat out by the on-board computer can be quite vague. But this isn’t one of them; in fact, it’s quite specific. Checking the code against the translation reveals that code 0705 refers to a faulty signal from the transmission-range sensor. This sensor sends information to the engine and/or transmission control module and is responsible for those computer modules knowing what the driver is asking for via the gear selector. Without a correct Park or Neutral signal from the transmission-range sensor, the engine won’t crank and start. Beyond that, the gearbox may select the incorrect gear thanks to the incorrect signal being sent. Replacing the range sensor is probably the fix you need to look at.