Hi all,

I spent the day tinkering with dads jag xjs (1991 early facelift 4.0), hoping to get it running and then change the gearbox ecu (see my other thread) but the first thing to solve- it won’t start.

Dad had it idling on the drive a few weeks back and it cut out and wouldn’t restart, the AA man he called a few days later reckoned it was either the coil or the ignition amplifier.

So this morning I replaced the plugs (I tend to do this as a matter of course when trying to get a temperamental car to start) ignition amplifier and coil, testing to see if the car would start after changing each component in turn.

No spark. The coil and amplifier have 12v with the key on. My next suspect is the crank position sensor, which I removed and cleaned but don’t have any way of testing. I’d buy a new one if local places had them on the shelf, but of course it’s too old a car for that.

Any other suggestions before I order a crank position sensor online? I’m only here for the weekend, just wondering if there’s anything else I should try.

cheers

 

Hi, if you have a faulty CPS it will show up as no movement on the rev counter needle when you crank it over. With a good CPS it will normally show a reading of around 300 rpm on the gauge whilst cranking, hope this helps.

 

thanks- the rev counter wasn’t showing any difference between turning the key to position 2 and position 3.

I’ve ordered a replacement cps and dad is going to ask the local garage (that we’ve used a lot) if someone can pop over and fit it.

Cheers