Jason's TBI thread

[babywag]

Yes, you just load a 2nd log file and play it back.

Better to drive a little longer, select sample count on the BLM history display and try to drive around and hit the cells with more samples.
Remember to try and stay out of AE, try to hold the throttle steadyish in increments.
You can manually shift the trans around too, hold 1st longer, drop from drive to 2nd etc.

If you want to populate the higher rpm areas quickly toss it in 4lo and play a little.
Obviously you want to check it anyway so it doesn't run like poo when your offroad.

[sgtpoliteness]

Just thought I'd update everyone on my progress. Jeep is running better than ever! I made several logs and it looks like my VE tables are real close, and error on the rich side. AE feels good, especially after I messed with the Power Enrichment settings this morning. I raised my idle speed up a touch (50rpm or so) and that took care of the little bit of stalling I'd encountered. Zero faults on a nice hard run in the heat of the day today (it was 80-ish).

I want to thank everyone for all their help on this! I couldn't be happier with the results of this project and would encourage anyone else who's interested to give it a shot. I tried to save each bin as I made changes and made notes about almost everything else.

Of course, the tuning is never done! But, alas, I need to return the Auto Prom to its rightful owner, Blake. I'm looking into picking up a Burn2 (don't really need an emulator, just something to burn chips) so I don't take valuable time away from Blake's projects.

Hot restarts are great. Cold starts have improved quite a bit from a few revisions ago. I did get some quick throttle application bog when I first did the PE adjustments but after a quick drive and a key cycle they're gone. That's one thing I've noticed - give a burn a long drive or a couple key cycles to set. I'm not sure if there's a learning delay, like in MAF cars, but it always seems to need it. Idle is 95% really good. Like, glass smooth good. The other times it's a little surge-y. Maybe a small vacuum leak or some work with the IAC control?

I've still got a lot of work making all the wiring look real pretty and getting the PCM mounted up, but it's more than driveable as it is.

If anyone has any questions or anything about doing this project, ask me!

[AwesomeJ10]

Sweet man!

[jaber]

Congrats on getting it drivable. I know what an awesome feeling it is...

[FSJ Guy]

Great news!

Cold starts are hard to tune since you only get one test per day.

[sgtpoliteness]

It's pretty brief. I'll address the cold start issue in the Autumn.

[AwesomeJ10]

Any updates?

[sgtpoliteness]

Nope, still running great! How were the dunes?

I spent two weekends ago spending all Saturday waxing the Warwagon! I haven't done any logging lately though. The wiring still needs cleaning up.

[AwesomeJ10]

Dunes were SICK!

I sold the 401 out of the waggy and now I'm wiring up another 4.3 V6. It has a 1228062 ECM that has an aftermarket chip to match the edelbrock intake/headers. I've already ran the engine on the stand and verified the ECM via winaldl.

I'm considering swapping over to my 'new' 7427 PCM and harness.

Did you ever find a text-based 7427 wiring pinout?

How can I extract the bin from the 8062 so that I can swap the settings over to the 7427?

[sgtpoliteness]

I never located a text-based 7427 pin out. I just printed out what I found on gearhead-efi and Alldata. There are a couple wire colors that don't match up. I made notes, I'll check them and let you know.

[AwesomeJ10]

Found the 7427 pinouts! http://fsjnetwork.com/forum/viewtopic.php?f=35&t=3908

So how's it running now that it's getting colder? Did you get an autoprom?

[sgtpoliteness]

I put the factory air cleaner housing on and that helped a lot. It's a little rough first thing for a few seconds and if I try to WOT it before the HO2 kicks in it stumbles pretty bad. But, once it warms up it runs awesome.

No, no Autoprom yet. I started at the VW dealer in Thornton and don't even have a lap top currently either. So far, so good though. Nice job on finding the pin outs!!

[AwesomeJ10]

Well I'm gonna hit the yards this weekend. Dunno if it's gonna be Saturday or Sunday. If you meet me there, I'll hook up the autoprom and give ya a little more fuel in the bin. I've never seen a 7427 bin, so it should be a learning experience.

[sgtpoliteness]

Awesome. Let me know!

[sgtpoliteness]

Finally went out a got a laptop after changing jobs. Which worked out great because I went to take the Jeep into work Thursday and it ran like dog****. Plugged in the laptop this AM and had a 'checksum error' in TunerPro. No RPM or Inj data at all. Remembering the great epic frustration of earlier this year I pulled the ECU access cover off and ah-ha! the chip had some ever so slightly
loose. Re-locked in all the chips and it runs a lot better now.

I had mounted the ECU upside down, above the passenger's footwell and behind the dash. Over the last several months it must have vibrated a little loose. Check the stupid stuff!!

[AwesomeJ10]

Nice find on the loose chip. I had that happen to the 7747 on the Honcho on the way back from las cruces. The SF512 chip rattled loose and was causing a random miss. Pushed it back in and no problems since.

So do you have the 7427 PCM case grounded? I've recently learned that you aren't supposed to let the exterior case receive ground. GM had little rubber grommets on the case to isolate the case from ground.

My 7477 is grounded on both J trucks and they seem to work fine...

[sgtpoliteness]

I believe those grommets are to help with vibration, not to isolate it from ground. I've seen all kinds of ECUs directly bolted to the body, from the factory.

Yeah, that's twice now that little chip has caused me grief.

[AwesomeJ10]

Not supposed to ground the ECM/PCM

http://www.gearhead-efi.com/Fuel-Inject ... ase-itself

But like I said, both of mine are fine being grounded...

[FSJ Guy]

Sometimes if you solder in a low profile ZIF, you can get the cover on and that will help keep the chip mounted. Or you could get all fancy and insert some standoffs and then mount the cover on top. It wouldn't seal, but it would at least hold the chip in.

[babywag]

I wouldn't use a ZIF socket for a (semi)permanent chip install.

A DIP socket is the way to go.
You can pull a chip out of a ZIF with your fingers, can't do that with a DIP (machine tool) socket.

Or, if running the memcal pcm solder the flash chip (or a DIP socket) right into the memcal.
I've never had a chip give me any trouble except when using a zif socket.

YMMV