Anyone know a good reference for the Rover 3.9 engine

[Ryukyurvr]

I know have officially 5 Land Rovers with 3.9l engines (one my own) that have all stopped running. All started and ran fine and either started to idle ruff and then died or started to idle ruff, started hard, until they wouldn’t run or in one case ran fine until it shifted into 5th gear t and now has no spark. And all of them have no spark now. It’s mind boggling since I cannot find any reason for the failure. In my vehicle since I didn’t know the condition of the parts in the truck I went and replaced all the ignition parts (distributor, coil, wires, plugs, fuel relay, ) and it still gets no spark, but I have four others with similar symptoms and no idea why because I’ve ran every test I can find in the manuals with a multi-meter and timing lights, Nada! Any insight or for that matter someone who knows these engines well enough I could talk to them over the phone or drive up and pick there brain as I tent to be the go-too guy for older Rovers here in my little corner of the world and I’d hate to have all these people thinking that Rovers are crap if they can’t fix them themselves especially as we get ready for winter which is what most of these vehicles were bought for!

[bsa_m21]

What years 3.9L engines and vehicles? What kind of ignition and fuel system in them? (simple Lucas points Distributor and coil?, Lucas 35DM8 dizzy?, Hotwire?, Carbs or fuel injected, etc?).

FYI - If you have a 35DLM8 dizzy with the amplifier bolted to the side, the amplifiers are know to fail quite often. A common mod is to replace the amp with a GM CEI module with very minor modifications (run some wires). It is a 4 wire module, various part numbers are: NAPA ECHTP45, Wells DR100, Niehoff DR400, or Delco D1906. I have a write up on how to do it.

So, provide us with some more info.