Had my Haltech tuned by Hal at Dynosty about 2 months ago and it was really great, cleaned up drivablity, helped with a number of things. Two minor issues, though:

One of them started happening right after Hal tuned it, and continues to happen 1.5 months later. Every time after I fill up at the gas station, and this has happened at multiple gas stations, across the country, my G won’t idle, except very rough,and the AFR gauge indicates it is running very rich (richer than 10.0). This lasts for about 1-2 minutes, and then everything is fine. This only happens after I fill up, and does not happen when I turn off the engine and restart it, unless I fill up in between restarting it. Any ideas as to why this happens, and what I might be able to do to fix it? Fuel pressure gauge shows no change in fuel pressure when this happens.


Second issue happened just recently, and has not happened previously: the electronic throttle apparently lost it’s calibration overnight. The battery was not drained or anything like that, still had a full charge, but overnight, the ETC lost calibration; when I started the car, it kept bouncing off the rev limiter until I turned it off. The solution was to recalibrate it with my laptop connected to the Haltech, but I would hate to have it happen somewhere where I didn’t have my laptop. Any idea why the ETC would lose calibration overnight? Car was stored in my garage, same as every night, there was nothing different about last night than any other night, nor was there anything different about driving it before or after (once the ETC was recalibrated)


Yes, I know the answer is to contact Hal, and I have done so, but I want to get some ideas from the tuning crowd, as well.

 

Don't know the answer to your fueling problem since I always have my car off while it's fueling

Problem #2 has happened to me once before and I had to redo the calibration.
I believe there is a new update to the Haltech which I have yet applied to my unit
but it does describe issues with the electronic throttle

Critical Firmware Update

It is strongly recommended that users with V1.11.0 or V1.11.1 upgrade to this version.

Version V1.11.2 firmware for BK theta and z33 ECUs has been released.
This version fixes faults that were found with electronic throttle and fuel composition sensor features.

Enabling the fuel composition sensor on a DPI causes ECU communication error
Improvement to Electronic throttle error detection

 

Thanks, I will have to check my firmware version.

Also, some clarification: I also always turn my car off when fueling. The rough idle/richness happens when I restart my car after fueling it. Sorry I wasn't more clear.

 

are you tuned VE or IPW?

 

VE, from a MAP. Definitely not injector pulse width.

 

ya i figured VE, if it was IPW it would be very easy to trace. VE uses soo much math/modeling, its hard to know where all the corrections come from.

True VE systems when setup well are much better, but sometimes I wish I had the option with my proefi to run IPW.

Was it bouncing off the rev limiter with no TPS input?

 

Yes; pushing or releasing the throttle had no affect whatsoever. The only thing I could do was turn off the car completely.

I checked the firmware, it already has the new firmware on it, I think I did reflash it to that.

Ah well.

 

Solved my first issue: values for the EVAP section in my Haltech map were somhow corrupted. I replaced them from the base map with good values and everythng is fine now.

As for the second issue, I have not had a repeat of it.

 

In my case I was stationary and lost throttle control. Just sat at about 2000 rpm and threw a cel code. Turned off car and restarted and was ok. This was with the latest firmware.

I have also noticed once when I turned off the car the throttle butterfly did not come to rest. Just kept opening and closing with the key out of the ignition. Put the key back and turned to ignition and off then issue went away

 

Dave how did you know your EVAP settings were corrupt? I have an odd issue where if I park my car at my parents house which is on a decent incline and leave the car sit there for a awhile it will not start. Cranks, Fires and stumbles around 150 rpm. Second or third go it stumbles and starts

It only ever happens at my parents house. No other incline has produced the same issue. Fuel pressure is ok. Thinking it may have something to do with evap values but have no f'in idea. Car starts perfectly everywhere else regardless of heat soak or temp.

Anyone have any ideas if it could be evap related?

 

I knew they were corrupt because there was only one cell for the entire table, and it had a value of -165527345875372652 or something like that.

As to your issue, not sure; you could always take the evap values from the stock map and use those, and see if the issue happens or not.

 

Currently has the stock values from the base map. May try to overwrite them and see what happens.

The easiest way to explain the issue is vapor lock symptoms