Mike LaBranche

I've had a problem with the 84 for several weeks now. It will be running along just fine then <snap>, something goes south and it runs like doggy doodoo. No power, missing, rough idle, etc. Then it will usually <snap> back into everythings cool mode. I've run all the tests I can find on the injection wiring, replaced the temp sensors, fresh plugs, new fuel filter, new afc relay, checked all the readings at the L-Jet plug and everything looks fine. So... I'm thinking it has to be the brain. The beast has over 150k on it so I figure it's probably about time for it to fail.

Anyone have a spare known good L-Jet brain they could let me try to confirm this before I go drop the bucks on one?

TIA

mulik51

I have a L-jet brain, but I am not sure if it works...I know it is not fryed, but as of everything else I don't know. If you will figure out that it is the brain, then I can send you mine for shipping + 20$

Klim

BC

I have one. Did you need it quickly?

ViribusUnits

Make sure you get the right brain.

There is a diffrence between the 80 and the rest of 'em.

Are you sure it's the fuel system? Any chance it's that infamous green wire, or rotor, cap, or the wires that connect the magnetic pick up to the green wire?

Mike, are you sure it's the brain in the fuel system?

There is a very strong possibility that it could be a bad AFM. I noticed you didn't include it in your list. They can be host to all sorts of bizar problems. I have a spare one lerking around somewhere, if you'd like.

Any chance it's the grounds? (I've had REALLY bizzar results with them.)

The L-jet brains are suppost to be darn near untouchable, so I'd suggest going through everything again, just in case.

BC

84? 84 was L-Jet?

Mike LaBranche

The AFM is relatively new. I replaced it last summer which fixed a stumble that would develop after cruising a long time at the same speed. It had a 'dead' spot or two on the contact surface and would just stop sending a signal at that position. I swapped another AFM in trying to cure this current situation but no luck.

Rotor, cap, wires are all new. I've cleaned all the grounds and the L-Jet connector reports good ground at all the right pin-outs. I've checked and cleaned the ballast resistors. I've jumpered the AFC and fuel relays. Don't know how to test the green wire so I guess that could be the culprit. I'm going to try Klim's spare L-jet and see what happens.

Brendan, yep... L-Jet. I think the 84 euros went to LH but the USA was still L.

Thanks all for your help, I'll let you know.

ViribusUnits

Might want to check the wireing for the magnetic pick up inside the distributer.

You do so by hooking an ohm meter to the greenwire, and then pulling a vacuum on the vacuum advance thing. If the wires are bad, the ohm meter will jump around alought. If they're good, then nothing will happen.

To test the green wire, just hook it up to an home meter, and shake it a bit. If the ohm meter jumps at all, it's bad.

Did you clean all the grounds? It doesn't matter much if they test out OK. They can be funny, and test out while things are stoped, be all weird if things are moveing.

Good luck.