7730

Atilla the Fun · Post by **Atilla the Fun** » Thu May 29, 2008 5:31 pm

I have a known-good one from my sister's 1990 3.1L, If anyone wants one.

nfswift · Post by **nfswift** » Fri Jun 06, 2008 3:43 am

A 7730 you say?

It's from an aluminum head 3.1L with coil packs, not distributor?

If so, I'll take it, does it come with the connectors though??

Atilla the Fun · Post by **Atilla the Fun** » Fri Jun 06, 2008 10:56 am

no, it's from an iron head, but it's a 7730 because it controls the EGR valve electronically, that's the giveaway. I have the entire wiring harness, and if you have the PROM chip and the cal-pak, as we used to call them in the early '90s, then it shouldn't matter, if I'm not too much mistaken. But you should probably check with Ryan aka Sinister, first. If it'll work, then how about $20 plus you pay shipping?

nfswift · Post by **nfswift** » Mon Jun 09, 2008 10:02 pm

Get back to you on this ASAP.

Thanks

Aaron · Post by **Aaron** » Mon Jun 09, 2008 11:47 pm

Are you sure it's an iron head? I thought all of the 3.1s were aluminum head...

Series8217 · Post by **Series8217** » Tue Jun 10, 2008 3:23 am

Aaron wrote:Are you sure it's an iron head? I thought all of the 3.1s were aluminum head...

No, the RWD ones were iron head

The Dark Side of Will · Tue Jun 10, 2008 7:11 am

Minivans also used iron head 3.1's.

nfswift · Post by **nfswift** » Tue Jun 10, 2008 7:28 pm

It's true... so it is a 7730?

As long as the ECU is complete with the memcal, plugs etc etc nothing removed and it's a 7730 from a DIS car, I'll take!

Thanks.

lucky · Post by **lucky** » Tue Jun 10, 2008 9:59 pm

from what i've been reading on P F F and on sinister's website doesn't matter if it's from a DIS or dizzy car. It's the same ECM, just a different code mask and slightly different wiring. As long as the service #'s are either 1227730, 16196344 or 16198262 and the memcal is from a V6 car it'll work.

nfswift · Post by **nfswift** » Thu Jun 12, 2008 2:11 am

The plugs would still have to be able to accept the right pins for RPM signal... I guess they all do?

It sounds like it's the right box and it's in good working condition, just what I need.

Just let me know if you can find the service number Atilla? Paypal is standing by.

lucky · Post by **lucky** » Fri Jun 13, 2008 2:53 am

The ECM can interface with your VSS with no mods. Your 2 ECM pigtails are the same as 2 of the 3 plugs on the 7730. You'll need to either cut/solder or re-pin the 7730 plugs with your wires in a different order (been said easier to re-pin). Sinister has diagrams free on his site. Your tach however either needs to run off the VSS or can be run off the ECM with a simple adapter circuit (diagram also free from sinister).

The Dark Side of Will · Fri Jun 13, 2008 6:49 am

lucky80 wrote:Your tach however either needs to run off the VSS

Umm... say what? :thumbleft:

Aaron · Post by **Aaron** » Fri Jun 13, 2008 11:25 am

lucky80 wrote:The ECM can interface with your VSS with no mods. Your 2 ECM pigtails are the same as 2 of the 3 plugs on the 7730. You'll need to either cut/solder or re-pin the 7730 plugs with your wires in a different order (been said easier to re-pin). Sinister has diagrams free on his site. Your tach however either needs to run off the VSS or can be run off the ECM with a simple adapter circuit (diagram also free from sinister).

What the hell is wrong with GM? How is every ECU so different? The 3.4 DOHC and 3.1 ECUs are nearly identical, and yet the VSS shit is different. On the 3.4, 91-93, you need to cross the VSS wires. You don't need to do this for the 7730?

And then I crossed the VSS wires for my 94-95 PCM, and the speedo doesn't work.

As for the tach, you don't need to do any of that. Out of the coil pack, there is a tach feed, it will be white. This goes directly to C3 on the C500 for the tachomoter.

Atilla the Fun · Post by **Atilla the Fun** » Fri Jun 13, 2008 11:27 am

The sticker is long gone, but the computer-controlled EGR valve and the year, 1990, prove it's the right one. How about this: I ship it to you C.O.D. and you try it, then pay me. I drove the car the day before I removed all the V6 stuff for the 305 install.

lucky · Post by **lucky** » Fri Jun 13, 2008 1:20 pm

The Dark Side of Will wrote:
lucky80 wrote:Your tach however either needs to run off the VSS
Umm... say what? :thumbleft:

Wow. Duh, I meant speedo.

EDIT: IIRC the 7730 will interface with either the Hall Effect pickup in the dizzy or the crank sensor on the later blocks to run DIS. As far as speedo, supposedly the VSS has a beige and a purple (IIRC) wire that run to the speedo. You end up connecting the beige wire to the ECM and the speedo, and disconnecting the purple wire from the speedo and connecting it to the ECM. OR you connect the 2 wires to the ECM and build the interface circuit to control the speedo via the ECM so you can recalibrate it via the MEMCAL, instead of by changing the VSS gear.

nfswift · Post by **nfswift** » Sun Jun 15, 2008 1:20 am

Check PMs Atilla

Atilla the Fun · Post by **Atilla the Fun** » Mon Jun 16, 2008 10:51 am

done. You have reply. hope this helps.

Atilla the Fun · Post by **Atilla the Fun** » Tue Jun 17, 2008 3:46 pm

Since there have been so many views, I thought I'd note that I can get all of these y'all want for about $50 each.

Atilla the Fun · Post by **Atilla the Fun** » Fri Jun 27, 2008 10:10 am

Sold and sent.