Startup AFR sits at 9.6 for 65 seconds.

[stephenb]

Hi all. I have been struggling with this issue since the install a few months ago. LS7 GM crate engine 570 HP, untouched out of the crate. Terminator X setup. Config File and datalog attached. When I start the car cold or hot the AFR sits at 9.6 for a extended period of time. Cold starts 65 seconds. Warm starts it can be less time, but still in the 30 second range. The only time it does not do this is if I shut the car off and immediately restart, but if I wait 20 seconds it will still do it. The car runs well once the AFR starts reading properly. I've gone through the tests with WBO2 sensor. Tested several. With a second sensor plugged in and not in the exhaust the AFR goes to 35 quickly. So the AFR in the exhaust is true at 9.6. Thanks for any advice.

[81 TransAm]

That's not normal behavior, contact Holley.

[andrewb70]

@stephenb: Send me an email, please. projectgattago at gmail dot com. Andrew

[stephenb]

Email sent.

[Boostedtruck]

Has anyone figured out a fix for this issue? I have the same problem. AFR sits at 9.6 for first 20-30 seconds after startup.

[andrewb70]

Does it do it both on cold and on hot starts? Andrew

[Rdf1]

I noticed the last Terminator X Max I tuned did the same thing. It took quite awhile before it started reading correctly. I ended up setting Min RPM a little above idle that way it doesn't matter how long it took to start registering as long as RPM was still at idle. Ordered a couple new sensors to test it with.

[Boostedtruck]

Does it do it both on cold and on hot starts? Andrew

It does it on both cold and hot starts, but longer on a cold start. If I turn the ignition on and wait for 10-15 seconds before starting, the engine shortens the time it sits at 9.6 AFR for. Seems like the WBO2 sensor is still warming up, so it faults to full rich? I had a spare WBO2, so I swapped it in. Didn't make a difference.

[andrewb70]

I'd contact Holley tech support. I've seen this before and there's no easy work around. For some reason certain Terminator X systems have a "lazy" WBO2. Andrew

[Boostedtruck]

Thanks for your input Andrew. I'll give Holley Tech support a call.

[MSLUCY]

Any updates on this? My Terminator X is doing the same thing.

[Rdf1]

I found the easiest workaround is to do an Advanced ICF Table and limit AFR correction for a certain amount of time after startup. Post your GCF tune and I'll make the table for you.

[Danny Cabral]

I'd contact Holley tech support. I've seen this before and there's no easy work around. For some reason certain Terminator X systems have a "lazy" WBO2. Andrew

"Lazy" WBO2 sensor or WBO2 driver/controller (ECU)? Have the Closed Loop or Learned Compensation Limits been turned down without Base Fuel Table tuning? Has anyone with this problem contacted Holley Tech Service (LINK)?

[andrewb70]

In my opinion, it's some ECUs, because swapping to a different WBO2 sensor didn't seem to make any difference. Andrew