Changing my MJ to a GM computer sys.

[Thorwon]

1 hour ago, Ωhm said:

Just being curious, are you batch firing the injectors or is it sequential? In other words how are the injectors wired?

 

The way I understand it, this computer only runs sequential. Each injector has an output from the PCM.

What's interesting is the difference in firing orders has to be taken into account. So I had to renumber the injector outputs.

Jeep Inline  6 - Firing Order 1 - 5 - 3 - 6 - 2 - 4
Chevy V6 4.3 - Firing Order 1 - 6 - 5 - 4 - 3 - 2

[Ωhm]

On RENIX each REV fires 3 injectors. Depending on the SYNC SIG (HI or LO) determines which 3 injectors will fire in sequence (153 or 624). That's all the SYNC SIG does. Firing the injector, for a certain cylinder, is fixed (during that cylinders EXHAUST stroke). You've done a nice job. Great conversion.

 

Check page21 (figure14).

Jeep_Renix_Fuel_Injection_manual.pdf

[Thorwon]

2 hours ago, Ωhm said:

On RENIX each REV fires 3 injectors. Depending on the SYNC SIG (HI or LO) determines which 3 injectors will fire in sequence (153 or 624). That's all the SYNC SIG does. Firing the injector, for a certain cylinder, is fixed (during that cylinders EXHAUST stroke). You've done a nice job. Great conversion.

 

Check page21 (figure14).

Jeep_Renix_Fuel_Injection_manual.pdf 1.43 MB · 85 downloads

That's the best explanation I've seen for the SYNC SIG. I wish I would have read it before I started working on this project. 

The thing is I have those PDFs. I've just never read them.

[Thorwon]

So I got the O2 sensor hooked up today and on the short test run I made it really helped it. I'll be driving it about 60 miles tomorrow, so we'll see how it does.
I'm running one O2 with it hooked to the input to both bank 1 sensor 1 and bank 2 sensor 1. I'm using bank 1 sensor 1 12v to heat it. I turned the DTC off for the other O2.
I've also got the fans running off the computer. 

[zomeizter]

Did you resolve the sync issue? I remember having that issue with a magnum V6, all that was needed was to turn the dizzy, but at the time I had a loaner snapon scanner that made it a swift fix...

[Thorwon]

10 hours ago, zomeizter said:

Did you resolve the sync issue? I remember having that issue with a magnum V6, all that was needed was to turn the dizzy, but at the time I had a loaner snapon scanner that made it a swift fix...

Not yet. I've got a friend with an oscilloscope that's going to bring it over. That way I can look at both the CKP and CMP sensor pattern at the same time.

Then I can turn the dizzy till they line up. Hopefully that's all I'll need to do.

[87MJJeep]

Fascinating mod.  Have you made headway with the O-scope?  

[ghetdjc320]

Deleted post - Accidentally posted in wrong topic

[Thorwon]

12 hours ago, 87MJJeep said:

Fascinating mod.  Have you made headway with the O-scope?  

Not yet. Life changes priorities for you every now and then. 

I'll post it when I get the opportunity to look at it.