This car is an example of a 1994 BTCC Ford Mondeo, the engine had been away for a freshen up.When it was re-installed it would not start.
The wiring is in poor condition, this is in part due to the nature of beast. It was never intended to be racing over a decade later. Many of the components are repeatedly removed checked and replaced. This places a great deal of stress on wiring looms and connectors.
The historic nature of this car means it has to look as did when it competed in the BTCC, any changes must be under the surface. The coil is powered by two ignition amplifiers that are very sensitive to voltage spikes.
So this was the first place to check. No switch during cranking, bad news. A quick check of the injectors also showed no switch, so the fault could be crank or cam sensors.
They need to be in sync, with the cam 40 degrees before TDC cylinder 1.
A quick scope of the sensors shows both outputs are good, however the cam sensor is positioned too close to TDC. The expected position id the cursor 1 in the picture.
How is this worked out?
The time for 1 rev is calculated from the scope trace then divided by 360. This then gives the time in ms for 1 degree. 40 degrees is 45.3ms.
Simples.
