thanks guys. seems like I should forget about the whole obd2 thing and just get that adapter and repin my harness for the 7427. This all came about because of a 'no start, no spark, no injector...

thanks

My J10 is running AMC 360 with an aftermarket HEI dizzy with 7 pin ignition module and of course, 2 barrel GM TBI powered by the 7747 that I soldered in a zif socket like 12 years ago. ...

Hey guys

I'm sort of an old school tbi guy and working on my 78 jeep j10 with gm HEI that I converted over to a 7747 12 years ago. It's worked great, but is now giving me trouble. Life happened...

alright so I found TDC and discovered that this thing was way too far advanced. the engine has no timing marks for some reason, so I make 'em.

runs better, but now I'm seeing a part throttle bog...

yes

but what if the bypass is connected? Still steady?

I see no difference with the bypass connected or disconnected...

I'm using a module that was working great in another TBI project. It's about 2 years old.

So here is my question - Should the timing marks (as viewed by a timing light) move around erratically at...

yeah - I even swapped ECM's and bin files.

I *think* I have it wired correctly, but it simply doesn't seem to time the engine...

I picked up an old GMC truck that came with a 350 and carb. So I naturally slapped a junkyard 7747 on it and it's running ok.

I'm running a GM 7pin module inside a stock GM HEI. When I put a...

I bought the HP tuner pro version.

anyone know where I can find the wiring diagram for a 12589462 PCM?

what about disabling VATS ?

I've read that you do that in the tune and I've read that you physically cross wires.

which is it?

I bought this engine.

http://www.ebay.com/itm/181735293435

Background - I am very proficient with TBI (GM 7747) tuning and wiring. I've built several of those systems on old Jeeps and have a Moates APU. I'm also Sr. Systems Engineer and very proficient...

I'll start my own thread...

how do I delete VATs? what tool do I buy?

I am getting ready to buy one of those ~$2500 8100 vortec's on ebay. Used engine that comes with the PCM.

I'm also swapping this to a nv4500 in an old Jeep.

What equipment do I have to buy...

thanks!

I'm actually swapping an entirely new harness in, so starting from scratch. Do you mind if I share that pinout on other sites?

So all I need is the G1 adapter, zif socket and sf512...

both are here

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?173-1227747-to-16197427-Conversion-PCM-Swap-with-Wiring-Pinout-Directions!

So I've done a few 7747 swaps and now feel comfortable enough to try out the 7427.

All I really need is the Moates G1 adapter right? I already have the APU1 burner.

Does anyone have the...

on my FSJ's, I have it bolted to the FW using the factory heater box bolts. Those bolts are spaced perfectly for this.

I've read conflicting info with regards to grounding the ECM/PCM itself. I'm talking about the metal case itself. Both of my Jeeps have 7747's and they are mounted against the FW and are definitely...

I'm excited for this!

found it here

http://www.diy-efi.org/gmecm/component_info/tbi_injectors.html

So what if you take an ASDU bin, then edit it in a lower XDF version, then edit it in a newer version? Does that cause any problems?

I've trying to follow Eagle Mark's recommendations (thanks BTW), but can't seem to find a critical piece of information for setting BPW.

Where is the injector sizing post that lists the GM TBI...

say I take a fresh ASDU bin file. What XDF file should I start with? I'm using _42-1227747-V4_3.xdf

Is there a 'better' one to use?

7747