Thorwon

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.

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

Well I've had to change up the distributor. When I installed it I didn't think about where in the crank rotation the sink signal was sent to the computer. I am getting a sink error. I have no way to look at the signal so I'm guessing. So I set the engine at TDC #1 and the reluctor was about 90 deg from the signal coil. I then rotated the distributor and reset the plug wires appropriately. It idles much smoother and runs stronger. This is a learning experience so I'm figuring it out as I go. I guess I'm going to have to buy an oscilloscope. And then learn how to use it.

Well the computer I'm using isn't the 0411. It's from a 2004 Chevy Astro van. I got the harness, computer and sensors for less than $100 at a upull it. I have put a couple more videos on youtube so check them out. https://www.youtube.com/channel/UCqgfTWTFVHdZk5huUMnj6sg

Well it runs pretty good for the first time I started it. https://www.youtube.com/watch?v=wxlzG2TspuE

I've got PCM Hammer for read/write of pcm and Tuner pro RT for tuning. They both work great. If you haven't already, check them out. https://pcmhacking.net/forums/viewtopic.phpf=42&t=7579&sid=4e43ec79a693c10834bca5f8ff752b72, https://www.tunerpro.net/downloadApp.htm

Well I made a little progress today, I got the reluctor and sensor mounted. Now that I have these mounted I can start running wires.

I'm doing a crank damper reluctor. I'm not exactly sure what I'm doing in the distributor yet. I've got my eye on a couple of options. I've been running this truck on a HEI and the renix system for the last year. They run fine in batch mode. But something else quit working and I decided this was enough of the renix system. Time for something newer.

It's not that I love that system that much. It's that, that system is so much easier to use than a Renix. The parts are easy to find anywhere. And the system is so flex able it just crazy. It's an OBDII system. I can hook up to it with my phone if I want/need to.

I won't be using any Renix or HO reluctors or sensors. I'm going to be using GM and custom parts. And I'm doing it to see if it'll work. I've got nothing to loose, it won't run now. And I'm not going to spend the time and money on replacing everything on this truck with factory parts. If I'm going to spend that much time on a project, I want it to be a little more modern than the Renix system when I finish.

I'll do it. I'm not much for taking pics but I'll fill ya in on the technical stuff.

From talking to a few LS guys and reading on the forums I listed above they are pretty amazing. People replace earlier computers with these. I'm going to try and run just the engine as a stand alone. It'll have a 02 sensor, a cam position sensor, a crank position sensor, speed sensor and a water temp sensor. I may end up adding other things, I just don't know yet. But I'm going to be running sequential fuel injection.

I don't know about "blasphemous" but if I can do it, I'll be able to tune it with software I already have. There is a tuning software ( https://www.tunerpro.net/features.htm ) you can download, cheap, out there. There is also a transfer software ( PCMHammer https://pcmhacking.net/forums/viewtopic.php?f=42&t=7378 ) you can download free. Both of these work great. They give me the ability to upload, download and tune the files in the 12200411 GM PCM. Gm used this PCM to run a lot of different vehicles and engines. I've been reading on several forums about what they are capable of. Check out http://gearhead-efi.com/Fuel-Injection/forumdisplay.php?32-OBDII-Tuning, https://pcmhacking.net/forums/viewforum.php?f=42, https://ls1tech.com/forums/fueling-injection-8/. There's a lot of information on tuning. There's just not much about Jeeps.

So, if I'm reading correctly, I can run a inline 6 on a 12200411 pcm. I'll need to put a 3x crank trigger and a 1x cam signal. If I'm reading correctly, I can run port fuel injection and a distributor for ignition. Can anyone confirm this? Has anyone ever done this? I've read several posts where people said they were going to do this but they never finished the project or just never posted that they did. I'll be machining my own crank reluctor and maybe building a custom distributor. The pcm I'll be using is a 12200411 pcm with a 4.3l V6 bin.

1988 MJ Comanche, 4.0L automatic trans, two wheel drive (for the moment) No door sticker I have everything to convert it to 4x4 so that's the current project. This is what she looked like the day I or her. Country of Manufacture United States Manufacturer Jeep Corporation Vehicle Type Truck Engine 4.0L, I-6, MPI Powertrain 4-speed automatic, floor gear shift, 2 W/D Body Type Jeep Comanche, 2-W/D Pickup, 6.0 foot bed, 113 inch wheel base Gross Vehicle Weight Cherokee E.C.E., Comanche Eliminator = 4001 - 5000 lbs Assembly Plant Toledo, Ohio, USA Model Year 1988

ghetdjc320 I sent you a message.