L-jet injection issue

spider98664 · Post by **spider98664** » Mon Mar 31, 2014 11:38 pm

'81 E12 5 speed. US spec.

My relay box on top of the brake booster has signal from the ecm, but no power to fire the injectors when the relay closes. Is there a fuse someplace that is bad?

If I bring power with a jumper to the pin it starts right up.

Also, I think I have 2 bad injectors. Local German specialist cannot get them. Sources?

Thanks!

Falkenberg · Post by **Falkenberg** » Tue Apr 01, 2014 4:30 am

Would that be the combo relay? Search on the board, these kind of issues have been discussed many times.
There is also useful stuff on the FAQ:
http://www.firstfives.org/faq/ljet/combo_fix.html
http://www.firstfives.org/faq

Mike W. · Post by **Mike W.** » Tue Apr 01, 2014 11:14 pm

Combo relays are a known problem, they're the double relay.

Injectors? The usual suspects, Autohausaz, Rockauto, Amazon.

spider98664 · Post by **spider98664** » Wed Apr 02, 2014 12:14 am

I checked the relay carefully and all the solder joints are good. The diodes work properly. There is no voltage (hot) to the relay.

Falkenberg · Post by **Falkenberg** » Thu Apr 03, 2014 9:17 am

That should not be very hard to track down?
I know some L-jet supply only at start or run (AFM switch) 12V to some parts of the relay, but I never had an L-jet myself.
A multimeter and electric schematics should be all you need.

spider98664 · Post by **spider98664** » Wed Apr 16, 2014 1:16 am

I jumped power to the output wires that go to the injectors and it started right up.

A replacement relay solved the problem all together.

Thanks for the help.

Firstfives.org

L-jet injection issue

L-jet injection issue

Re: L-jet injection issue

Combo relay

Re: Combo relay