Hey everyone! I'm happy to say my datsun runs well enough to drive, however I beleive it has two problems . So I have a new regulator, new plugs, new injectors and checked the plugs and looked perfect, milky white insulator and electrodes looked polished ( too lean?) Literally the electrodes and ground of plug look like shiny bare metal . This is interesting because I began this journey with plugs that looked like dry dusty soot . (( Hella rich) so, also have new temp sensor ) i beleive someone has changed the afm settings in the past I welcome any opinions . So my question is should I consider the preload or the postion of the door. It is clear someone has been in afm . Thanks also it seems plug three is splash fowling but that's another problem I guess

Eats, shoots, and leaves? Eats shoots and leaves. Runs, but rough. Runs butt rough.

Just kidding. Are there any glue blob marks on the AFM adjustment screws? Match them up if you can find them. Nissan placed a blob of silicone on the wheel after it was set at the factory.

What do you mean by "rough"? At idle, during cruising, during acceleration? It's fairly common for the 280Z's to run lean. There's a modification that can be done, described by Blue on his atlanticz pages. He also has an AFM "reset" procedure for AFM's that have been messed with.

https://www.atlanticz.ca/zclub/techtips/EFI&fuel.htm

And if you can find an AFM that hasn’t been modified. The wiring harness itself could be the culprit. After replacing all of the connections on the EFI harness made a huge difference for me.

26 minutes ago, morgan12 said:

Hey everyone! I'm happy to say my datsun runs well enough to drive, however I beleive it has two problems . So I have a new regulator, new plugs, new injectors and checked the plugs and looked perfect, milky white insulator and electrodes looked polished ( too lean?) Literally the electrodes and ground of plug look like shiny bare metal . This is interesting because I began this journey with plugs that looked like dry dusty soot . (( Hella rich) so, also have new temp sensor ) i beleive someone has changed the afm settings in the past I welcome any opinions . So my question is should I consider the preload or the postion of the door. It is clear someone has been in afm . Thanks also it seems plug three is splash fowling but that's another problem I guess

That plug IMO doesn’t look like it’s firing.

What i mean by " rough" the car starts easily, ( with an unplugged cold start injector ) , the car ildes fairly consistently, it does not stumble when settling back to idle it just sounds like a lumpy cam in an old Chevy or how the engine sounds when you retard the timing too much at the distributor . As for the afm I have not opened it up but by the look of the copious amounts of silicone holdingthe cover on i beleive someone has.

6 minutes ago, Yarb said:

That plug IMO doesn’t look like it’s firing.

Hmm. I guess i will rerun the noid light test and then the fsm injector circuit test . What igniton tests do you recommend.

21 minutes ago, Zed Head said:

Eats, shoots, and leaves? Eats shoots and leaves. Runs, but rough. Runs butt rough.

Just kidding. Are there any glue blob marks on the AFM adjustment screws? Match them up if you can find them. Nissan placed a blob of silicone on the wheel after it was set at the factory.

What do you mean by "rough"? At idle, during cruising, during acceleration? It's fairly common for the 280Z's to run lean. There's a modification that can be done, described by Blue on his atlanticz pages. He also has an AFM "reset" procedure for AFM's that have been messed with.

https://www.atlanticz.ca/zclub/techtips/EFI&fuel.htm

Idle and acceleration seem to be the problem. It cruises fine.

When you click on Zed Head's link to atlanticz find TPS Adjustment and see if any of that sounds familiar. There easy to fix once you where the vanes are supposed to be.

Oh yeah. Those AFM black covers get popped off and on all the time. I can't remember the times I've read on here of people screwing with the wheel and wishing they hadn't. Look for those factory silicone blobs.

Edited 3 hours ago3 hr by siteunseen