We have ignition!

For all those wiring gremlins we love, this is the place to discuss them.

Moderator: Board Moderators

Post Reply
richardw
Moderator
Posts: 2224
Joined: Wed Feb 06, 2013 15:06
Model: Elite S2.2 Automatic
Colour: Essex Blue
Year: 1981
Location: Worcestershire

We have ignition!

Post by richardw »

I’ve been struggling to get my car ready for Oliver’s funeral next Thursday. Basically, it wouldn’t start and as it has fuel injection I was trying to monitor the ecu with my laptop. Every time I cranked the starter the ecu went dead. To cut a long story short, I found today that the switched ignition feed that feeds the main power relay for the ECU was only showing around 7.5 volts, and dropping below this during cranking, meaning that there was insufficient voltage to activate the relay. Now I have battery voltage on this feed and the car starts!

For years I’ve had cold starting issues - I wonder if this was a causal factor?

I also wonder what is causing the voltage drop - unless the ballasted power feed to the coil was used to feed the ECU? No time to check it out though - need to put the car back together for the MOT tomorrow.

Cheers Richard
Image

Pete Boole
Senior Poster
Posts: 3711
Joined: Tue Apr 04, 2006 21:28
Model: Elite
Colour: Monaco White
Year: 1974
Location: Nottingham

Re: We have ignition!

Post by Pete Boole »

Well done! Sounds weird though :?

Pete

Post Reply