ECM questions

90-92 injectors are two different kind on the primaries. Primary have the nozzle tip shaved off and the secondaries are the same as the 93-95 injectors. The 93-95 cars use the same injector for all 16 ports.

[yellowz]

hey tom did you check for a bad coil that will do it also

[tomtom72]

Hi Jeff,
Okay I'm not getting something about the injectors. "90-92 injectors are two different kind on the primaries. 1* have nozzel tip shaved off."

The 93-95 injectors are all the same, 1* & 2*, and the 90's use 93-95 injectors as secondary injectors? I think I'm not clear on what to tell RC. If I order by application, 1* & 2* injectors for a 90 Z they will know what to sell me? Or should I just get OE injectors For the amount of cash involved in injectors I would just as soon buy the S/S RC injectors. Help! I thought this would be simple, obviously I'm mistaken.

Yellowz, I have spark on all the plugs. I'm buying all of the parts that go under the plenum so I only do this once, hopefully for another good while. So far santa brought: Vac hose, vac solenoid & filter, actuators, tank, breather hoses, top end gasket set, magnecor KV85 wires. Next on the list is spark control module, Ign control module, 16 injectors, 45,000 volt coils from Jegs, starter & alt. rebuild parts, & anything else I find under there on my parts CD. If I can find space that will let me work I might even send some stuff to Mr. H for some fix'in. If not I need to have all the parts so this is done in one shift as I have no garage.

It ain't purdy but it all I've got. I've reduced it to the simplest form of work...parts changing.
Thanks for the shout!
Tom

[Aurora40]

Originally Posted by tomtom72

Hi Jeff,
Okay I'm not getting something about the injectors. "90-92 injectors are two different kind on the primaries. 1* have nozzel tip shaved off."

Here are some pictures of them I found on Delphi's website.

Primary:


Secondary:


The 1993-95 injectors look pretty much the same as each other

Primary: and secondary:

[tomtom72]

Thank you Aurora40 for the info. Looks like the secondaries on a 90 could use the injectors from 93-95. The 90's primaries look unique to me but I don't know what to say beyond that. Looks like I'll try Delphi.com & look around to see what I can learn.

Thanks for the effort, much appreciated!! Z owners are the best!


Tom

[Aurora40]

Originally Posted by tomtom72

Thank you Aurora40 for the info. Looks like the secondaries on a 90 could use the injectors from 93-95. The 90's primaries look unique to me but I don't know what to say beyond that. Looks like I'll try Delphi.com & look around to see what I can learn.

It's sort of a cool site, though ultimately doesn't seem to help me find a good price on anything... :-\

Anyway, try: http://go.delphi.com/default.asp?Language=English

the injectors for 1990-92 are FJ10004 and FJ10005. For '93-95 it's FJ10019 and FJ10020. I got this info from the mailing listserv. You can see the vehicle application list on the delphi site for each injector, though.

Also, their initial page on MPFI injectors would suggest they are all now compatible with ethanol fuels.

[Kevin]

fyi the secondary is an lt1 injector.

[tomtom72]

Thanks Kevin! I see there are alot of choices for the secondary replacement injectors. What is with the primaries? I see the machined part of the nozzle(?) necked down but what is the reason? Where does the O-ring go on a primary?

Was that something to do with the "air over" theory in the injector housing? It seems to me that the injector housings must be different on a 90-91-92 motor comparred to a 93-95 motor?

This stuff makes me wish I spent less time learning my holley & more time paying attention to FI developments.

Thanks again for your help!
Tom

O ring is in the injector housing further up the neck on the injector.

And yes the injector housings are different 90-92 and 93-95.

[wdo-mkr]

Originally Posted by tomtom72

Thank you Aurora40 for the info. Looks like the secondaries on a 90 could use the injectors from 93-95. The 90's primaries look unique to me but I don't know what to say beyond that. Looks like I'll try Delphi.com & look around to see what I can learn.

Thanks for the effort, much appreciated!! Z owners are the best!


Tom

One other thing to take notice of is the locating key that is on the bottom side of the connector for the wiring. The keyway is offset on the secondaries vs. the primaries. Its nothing that a quick pass with a grinder won't fix, but if you are thinking about having the machine shop grind down the primary injector boss at the bottom of the injector, then have them sand the black plastic locator boss on the electrical connector as well.