Jeep 4.0 or more accurately a 4.6 STROKED 4.0 with Jeep injection hardware???

[EagleMark]

Go to the $0D infor thread and get the xdf, adx and a bin, read the read me's in XDF. There's also a TBI to MPFI zip folder there. I just know of it but have not used it.
http://www.gearhead-efi.com/Fuel-Inj...Information-OD

Have not done the DIS either but from what I read on guys like Six Shooter who did it only involves a crank trigger wheel, which some newer jeeps have on flywheel, the guys have been making a notched wheel and sensor mount off crank.

[Six_Shooter]

The easiest code and ECM to start with for MPFI and DIS, especially on a 6 cylinder, would be $A1, used in the '7730/'7727.

[doc65]

The easiest code and ECM to start with for MPFI and DIS, especially on a 6 cylinder, would be $A1, used in the '7730/'7727.

Ok, I'm sure this is a dumb question, but what is the difference between the two 7730 vs 7727?

[RobertISaar]

one uses 3 connectors and isn't waterproof, the other uses 4 connectors and is waterproof.

[JeepsAndGuns]

The easiest code and ECM to start with for MPFI and DIS, especially on a 6 cylinder, would be $A1, used in the '7730/'7727.

What about MPFI and a distributor, must be SD, prefer NOT to use a MAF, and for a 6cyl.
Still the 7730/7727? Any other possiable ecm options to look at?

Doc, the 7727 is the waterproof one, 7730 is a underdash unit.

Also, I have just finished installing MPFI on the 401 in my cherokee using the 7427. Just had to mod the ecm a bit, and the bin changes. Followed the instructions in the zip file I got here. But I am having to get some air filter and air intake issues sorted before I can drive it.

[RobertISaar]

7730 were used in a few speed-density MPFI/dizzy V6 apps, the biggest ones being 3.1 and possibly 2.8 F-bodies.

[JeepsAndGuns]

Doing some more looking through this FSM on disc I bought, its for 93 wrangler and XJ cherokees. For some reason I started looking through some of the XJ wiring diagrams, its the same engine and injection system. But for some reason they label the wires on the diagrams diffrently. On the XJ side, the 5 volt refrence (or feed) for the tps and map, is simply called "5 volt feed" but on the YJ side, its called "sensor return" wtf?...lol. And because of this diffrent labeling of the same wires, I found out something interesting. The crankshaft position sensor, camshaft position sensor, and the VSS are 8 volt refrenced. (they are all 3 wire sensors) If running the engine with a gm ecm, the crank and cam sensores are not used, so that no problem, but now I wonder about the VSS.
If I was to swap to the gm ecm, I would need the factory VSS to still function, otherwise my spedometer will not work. So now I wonder what signal the vss sends out, if this signal is compatable with the gm ecm, and/or if it would work with a 5 volt feed? Otherwise I would need some way to feed it 8 volts.
This is only a problem for me, since I would be installing it in a factory vehicle. Wouldnt be a problem for the OP since its a conversion, and he can use a non factory vss.

[doc65]

That's interesting, coincidentally I ALSO have the Engine, Trans, Wiring Harness & PCM from a 1993 Jeep Cherokee that I could swap on complete, might even do that temporarilly...

[EagleMark]

The crankshaft position sensor, camshaft position sensor, and the VSS are 8 volt refrenced. (they are all 3 wire sensors) If running the engine with a gm ecm, the crank and cam sensores are not used, so that no problem, but now I wonder about the VSS.

Is there any diagnostic tests for the VSS? Three wire i'm guessing power, ground and signal. If it had diagnostics you could see what the signal was?

[JeepsAndGuns]

Yea, its 8 volt power, ground, and signal. I will have to check it this afternoon when I get home from work and see if it has any diagnostic for the speedo/vss.

[JeepsAndGuns]

That's interesting, coincidentally I ALSO have the Engine, Trans, Wiring Harness & PCM from a 1993 Jeep Cherokee that I could swap on complete, might even do that temporarilly...

Nice, that should make things easyer for us both, since are wiring and pinouts should be the same. If you swap to a 7727 ecm, then we can put our heads together to make a pinout conversion.
Is yours a auto or a manual?

[JeepsAndGuns]

OK, checked, and the only thing it has is to unplug sensor, and check for power, then check for connection between the plug for the sensor and the plug on the speedo. To test the speed sensor itself, refer to the powertrain manual, this one is the body, chassis, and electrical.

Funny, on the cherokee side, it say to check for battery voltage between two pins on some connector, but doesnt specificly say witch connector, but from the way it read out, I'm thinking its the plug on the guage cluster.
On the wrangler side, it says to unplug the connector from the speed sensor and check for atleast 5 volts on the power in wire. Humm. Guess the only true way is going to be check my wrangler. Mabey we can use a extra unused 5 volt wire on the ecm?

[JeepsAndGuns]

So since the 7727 and 7730 are usally refered to as being almost the same, just one waterproof, and they both being able to run the same code masks and bins. Do the memcals also interchange? Can you use a memcal from a 7730 in a 7727, or vice versa? Also, what about memcals and codemasks? Could you use a memcal from a V6 $A1 mask, and use it with $8D? Take a V8 $8D bin, change cyl count to 6 and then use it to run a 6cyl and run the $8D mask using a V6 $A1 memcal?

[RobertISaar]

everything you just said: doable.

i've even used the 94-95 3100 A-body and 94-95 3.4 W-body MEMCALs in the 7727 style ECMs, and those original PCMs are high frequency MAF based.

you can interchange a LOT of MEMCALs between the various P4 units. obviously, you may need hardware mods to change the cylinder select that's generated via the NETRES if you're using a V6 MEMCAL on a V8 engine.

[JeepsAndGuns]

you can interchange a LOT of MEMCALs between the various P4 units. obviously, you may need hardware mods to change the cylinder select that's generated via the NETRES if you're using a V6 MEMCAL on a V8 engine.

Good to know.
What about 7427 memcals? Could you use a 7427 V6 or V8 memcal in a 7730/7727? I'm thinking no, since they are tbi memcals and the 7730/7727 are mpfi. But I'm only talking about the knock sensor/netress part of the memcal, chip would be a eeprom with proper 7730/7727 bin file. I know I had to soder in a jumper wire on the memcal on my 4727 when I switched it to mpfi.
As far as V8 Vs V6 memcals, I wont do that, I would just find a correct memcal for what I'm using (V8 memcal for a V8, V6 memcal for a V6)