I am tuning my 91 Chevy G30 454 4l80e motor home with a 16147060 ECU with AWYP memcal. I have read through most of the postings about the $85 and have a couple of questions.

Is this list...

The attached datalog is for a 1968 Landcruiser with an older non TBI Chevy 350 (no EGR) and it is running rich. Is the reason the IAC position climbs to 140 because the ECU is trying to lean the...

When I added a heated o2 sensor I used D6 for the ground but it was not connected to the engine block which I corrected now it works fine. Also the bin I was using was "AKAR 87 R-V Truck 5.7TBI 4...

I am having a problem with the o2 sensor output. I am using a new heated o2 sensor (Bosch 13077) with the input from the black wire (weatherpack pin C) to D7. I checked continuity of the wire and all...

I am having a problem with the IN/BLM being fixed at 128 as well as no change in the o2 sensor. I have checked the wiring and tested the o2 sensor and all looks good. XDF is $42-1227747-V5.9.3.xdf...

Exactly the problem I was having. I Used a Howell wiring harness when I installed the SBC 1227747 TBI in my Jeep and it had a connector labeled "PARK NEUTRAL DISCONNECT May Be Emission Requirement" I...

I think I understand why the IAC stopping at 39. With the engine warm and a start-up in park (P/N grounded) the ECU locks the IAC counts at 39 and when you put it drive (P/N open) it drops below 39...

Did everything suggested relative to the idle and the IAC still got stuck at 39. I disconnected the p/n wire the tag went from Park to Drive and now it at idle and IAC count of 22. What's up with...

Thanks for the info and your time looking at these, I will get back to you when I get a chance to make the changes and datalog.

Bill V.

High HC is unburned fuel and usually a spark issue in a sound engine, could also be vacuum leak, weak cylinder or 2, burnt valve on unsound engine.

I hadn't considered that since it is a...

Hi Dave,

You helped me tune my 72 CJ5 304 several months ago it is running great!

I increased the idle as suggested by the smog tech. I have included the original bin and my modified bin...

My 79 CJ7 (Chevy 5.7l TBI 1227747) recently failed the Calif. Smog test with high HC at Idle. I found that the pintle on the IAC had stuck in the TB and replaced it and now I am having trouble...

Hi, I have been reading and learning about EFI from Gearhead and have now run into a snag so I would like post my first request for help.

I have 2 project Jeep CJ's and have found some great help...