hoping to find some EFI troubleshooting advice aND recommend

[johnatthebox]

Hi I should probably start by saying that this is my first EFI car and I have zero tuning experience ( with EFI I mean....) This setup was on my car already when I bought it. 383 sbc Holley Stealth ram , Holley rails and injectors, BBK tbody, ACCEL gen7dfi
I work on my own stuff, but have always been a carbs and points guy until this car.
Here's where the circus music should start up-
I don't have the ability to tune Accel gen 7. The Cal map cable that I have is damaged and is no longer recognized by the system. I knew that when I bought it . I didn't know at the time how hard it would be to find it replacement Accel gen 7 cable.
It hasn't been an issue it's been running4 a little over a year now that I've been driving the car i
as my daily driver. In the last month it has for whatever reason gone Rogue I'm prepared to replace the Accel gen 7 but before I do, I want to make sure it is 100% necessary. I was hoping to be able to run the symptoms by you and see if it sounds familiar? From a cold start it will run fine and I can drive about a mile and then at the same spot it will start surging violently and then cough and die. I pull over and park and wait 10 minutes the car will start ,run fine for about a mile and then do it again. I can smell it just dumping fuel but then it will starve itself lean 30 seconds later and then do it again you can also hear a ticking coming from the Gen 7 box when it starts screwing up . the other thing I noticed is that my air-fuel digital gauge keep resetting itself like I had shut the car off and on when the surgIng starts. Does this sound like a bad controller ?

[In-Tech]

It does sound like the controller has a failure. It's been quite a while since I messed with a gen 7 or 6 so I can't remember if the 7 is potted. I would take it apart and look for some bad components. The wideband going out at the same time as the failure starts is troubling too. I'll contact a tuner bud of mine that has tons of experience with the Accel stuff and post back when I can.

[johnatthebox]

It does sound like the controller has a failure. It's been quite a while since I messed with a gen 7 or 6 so I can't remember if the 7 is potted. I would take it apart and look for some bad components. The wideband going out at the same time as the failure starts is troubling too. I'll contact a tuner bud of mine that has tons of experience with the Accel stuff and post back when I can.

Hey thank you so much. It was a long shit that maybe there would be a simple fix it answer. I know you recommend using GM controllers over aftermarket stuff(im pretty sure you do , right?). If i were to go looking for one , which would i have the most success with?
Thanks-
AJD

[In-Tech]

Based on what I am hearing from you, I would use a '7730 ecm(or the waterproof '7727 version) since it sounds like this is a TPI variant project. Maybe repairing the accel won't be bad, I will know more tomorrow.

[brian617]

Does that controller use an o2 or wideband for closed loop feedback?

[NomakeWan]

Does that controller use an o2 or wideband for closed loop feedback?

Both of those are stock GM ECMs. They use narrowband O2 sensors for closed loop feedback.

[johnatthebox]

Does that controller use an o2 or wideband for closed loop feedback?

Wideband