I was skimming through some old forum posts regarding marelli issues, if timing Adv is possible, etc. I noticed in some of these low quality images their cars had a loop wire on the black plug for high-octane fuels? I seem to be missing such a looped wire? Can someone confirm if/what I'm missing as I swear it was there at some point...

I run 94octane anyway car doesn't have issues.


EDIT: I found another post from waaaaay back that shows this item missing it's loop connector so I made one out of wire, I have no idea how long I've been driving with the part having fallen off or been misplaced but my god that is quite a difference...went and bought some xylene and fuel lubricant for a special tank of "race gas" and its beautiful, so much grunt off the line to.

 

It should run better with the timing advanced to take advantage of the octane.

It's just a jumper:

Jaguar V12 Marelli Jumper

Big difference after you put the jumper back in huh? Nice.

~Paul K

 

That jumper was not installed in Australia from new, the owners manual says to take the car back to your Jaguar dealer who can install the jumper.

You could wire in a switch to change maps. I always use 98RON so I made a link that plug in.

 

I assume the photos you posted show your car without the jumper. Can you post a photo showing how you fixed this? Thanks in advance.

 

X2... I think I have this jumper already (I didn't install it it came this way) BUT I would love to see that section of electronics with the jumper... Or,,, is that what it looks like complete... I'm not at my car.

 

Can someone please advise if I need to add the jumper to map for higher octane fuel?

There are 3 cylindrical electrical connectors zip tied together — one large black, one small black and one small red. There are several multi-color wires connecting the 3 at one end.

At the other end, the large black has no wires, the small black has a small jumper, and the small red has multi-color wires leading somewhere else

I’ve attached photos of what is described above.

 

Good morning Brother... I understood those to have something to do with advancing the timing on the Marelli Cars but don't know much more than that. I am super interested to spy on y'all's more experienced insights as to what this is all about... Thanks for starting a conversation!

 

Your already selected for high octane. The black plug needs the loop to 'select' high, remove the black plug end for **** gas.

Please don't use shitty gas the higher the octane the better they run you make it back in MPG and less injector gunk.

You can confirm by going for a short fast drive with and without the black plug peice in...you should notice the car is either peppy or unenthusiastic. Just don't use shitty gas.

 

Thanks for your help!

 

Thanks Van!!!