Ugly Duck wrote:
Being that this is a 740 you don't have to be too careful about distributor position: it's driven by the cam and it only slots into the cam one way, so it's impossible to put in wrong. It's also not going to seize into the back of the head like a block mount can do. There is a timing adjustment required after you're done but again this is straightfoward.
Wiring harnesses on earlier (pre 88) 740s is just as bad as any 240. I would say that among the many potential ground failures, the harness itself is a top contender to be your problem. There are a number of grounds peppered around the car - like, 12 or 13 of them - that you should really check. Remove, clean, and use a conductive cleaning paste like Tunerlube (you should be able to get some at a serious electronics shop) and don't stop until you get them all. Also, check your fuse box: I've had to replace a melted one that was causing all sorts of problems.
Thanks for the advice.
Did check the fuses and relays. Took them all out and added the Tuner lube. Electric grease the guy at Napa called it.
![Smile :-)](./images/smilies/icon_smile.gif)
Nothing seems wrong from the top of the box.
I found a wiring diagram online but it does not really tell where exactly all the ground connections are on the car. Do you know if there is a list somewhere?
Peter