That's the document that I referred to in my first post. It was based on (I believe) a 7730, which is very different than the 7427.

Thanks. They are tuning PE in that thread, and I'm working on AE. I actually have my PE working pretty well right now.

Trimalyzer? Link?

Thanks for that.

Through a lot more driving and data logging and smoothing of the VE, it is driving nicely except for the stumble. But now I can reproduce the stumble pretty consistently and...

Hi,

Are there any good tutorials on the AE functions for the 7427? I read the existing paper on the earlier ECUs, but I can't equate the parameters in the early ECU to the information in the...

This right here.

My 87 7.4 used an adapter on a factory spreadbore intake. I went to an Edelbrock 7.4 TBI intake and really wasn't happy with it. I went back to a 4-bbl intake with the adapter...

So, interesting update. I had written down that the memcal which came with my 7427 was for a 4.3 so I really thought I was onto something with switching to the 7.4 memcal. When I pulled the old...

Well then the question for the smarter people is how does it count? If it is counting 3 ignition events then firing vs 4 ignition events That would definitely mess up things. These don't have a way...

Thank you for that. I think I was too focused on 7427 in my search and forgot about the compatible ECUs.

So cylinder select... that could be my problem. If it thinks I have a 6 cyl then my injection pulses will be off. So fewer pulses would solve the riddle on why I'm needing to tweak my flow rate and...

With Moates being closed, I can't go ask over there. I'm hoping someone here knows or remembers. What functions are still used from the factory memcal when using the G1? In going back through...

I am using the spreadsheet. I'll try bumping the surrounding cells first. Thanks!

As I said in my other thread, I still have a VE spike at about 1600rpm/40-60kpa where the VE wants to be >100. Surrounding cells are mid-80s.

Engine is a 87 454, basically stock. It has an...

Hi all,

Been away for a while. Truck has been running decently with occasional random high idle that seems to reset with an ignition off then back on, and occasional lean stumble with a VE spike...

Bumping this as I still don't have a good answer.

I have one of their throttle bodies also. I've been through a number of injectors, multiple IAC, and I'm pretty sure several TPS. But I need to get it on the logger when it is acting up. I know...

Yep the plan is to remove the ZIF when I'm done. Always just seems there is something to tweak in the tuning.

Yes on the G1 adapter, but using the S2 ZIF socket. I didn't have the PROM cover on the ECU and I just have it laying in the cavity where glove box is. The road out was rough and I must have just...

I have that same schematic. I have yet to find a fuel pump module anywhere on the vehicle.

Thank you so much for following through with your solution. I have that same issue, though I'm sure I've swapped TPS's since it started. Still, I'll toss in a new one and keep this one as a spare.

Got home and doing quick diagnosis. When I turned the key on 1st thing I noticed was fuel pump never shut off it just ran continuously. I plugged the injectors back in and passenger side injector...

87 7.4 TBI. 7427 ecu. It has been running great. Made a trip to the dump today and on the way out it started stmbling and CEL came on. I pulled over and jumped the pound but no codes came up (just...

I can speak from experience. Start with a manual bin. There are A LOT of differences. It is much more than just the auto/manual flag. If you already have a good VE from tuning, just paste that...

I just had a random thought and was wondering if it was possible. I know when we data log we get the BLM values, but are we able to somehow get the values that are currently stored in the ECU? It...

Hi all,

Tuning the 7427 there are 2 parameters for the idle vs off-idle tables - speed and TPS %. Right now I believe the factory settings are 3mph and 3% TPS. My question is do both parameters...