chaseincats Posted June 27, 2021 Author Share #133 Posted June 27, 2021 (edited) Here's an interesting observation. Every so often (a handful of times since finishing this project) I've noticed the car running more lean than usual (in the 16s instead of 14s). Any idea why that would be? All the contacts are clean and literally the only thing I do to fix this is shut the car off and just restart it - then the computer behaves properly. This has literally happened maybe 2-3 times since I was able to read the engine's a/f ratio with the gauge and is a non-issue since a restart fixes it but I am curious. Reminds me of "The IT Crowd"'s famous line, "have you tried turning it off and on again?" Edited June 27, 2021 by chaseincats Link to comment Share on other sites More sharing options...
Patcon Posted June 27, 2021 Share #134 Posted June 27, 2021 What are the outside temperatures when this happens? Link to comment Share on other sites More sharing options...
chaseincats Posted June 27, 2021 Author Share #135 Posted June 27, 2021 1 minute ago, Patcon said: What are the outside temperatures when this happens? Yesterday was pretty hot actually - mid 90s. Link to comment Share on other sites More sharing options...
Patcon Posted June 27, 2021 Share #136 Posted June 27, 2021 Get some compressed air and cool the ECU when it does it and see what happens Link to comment Share on other sites More sharing options...
chaseincats Posted June 27, 2021 Author Share #137 Posted June 27, 2021 1 minute ago, Patcon said: Get some compressed air and cool the ECU when it does it and see what happens Will do. Why do you think a restart solves it though? Link to comment Share on other sites More sharing options...
Patcon Posted June 27, 2021 Share #138 Posted June 27, 2021 Wild guess is that it cools off some Link to comment Share on other sites More sharing options...
Captain Obvious Posted June 28, 2021 Share #139 Posted June 28, 2021 Hmmm. Interesting. And no idea why that would happen. So have you driven the car with this "lean boot" condition? Does it stay lean the entire time? Or did you shut it off and restart as soon as you saw the issue? Link to comment Share on other sites More sharing options...
chaseincats Posted June 28, 2021 Author Share #140 Posted June 28, 2021 3 minutes ago, Captain Obvious said: Hmmm. Interesting. And no idea why that would happen. So have you driven the car with this "lean boot" condition? Does it stay lean the entire time? Or did you shut it off and restart as soon as you saw the issue? Lean boot is a fantastic way of describing this. Yeah it literally will run lean for the duration of that boot. I ran it like that for my entire trip then when I got in the garage I shut it off and immediately turned it back on and it dropped back down into the 14s. Link to comment Share on other sites More sharing options...
Captain Obvious Posted June 28, 2021 Share #141 Posted June 28, 2021 Crap. That's the wrong answer. Haha!! I was kinda hoping you re-booted it right away and it went back to normal. I think that would be easier to figure out. (Not easy, but easier? Maybe?) So I got nothing right now... I'll think about it and see what I can come up with? Or maybe someone will chime in with some uber-smart theories? Not temp related... Not vibration related... Not system voltage related......... I wonder if my thinking cap will fit under my aluminum foil deflector beanie. 2 Link to comment Share on other sites More sharing options...
Captain Obvious Posted June 28, 2021 Share #142 Posted June 28, 2021 This is a 78, right? With mostly stock EFI system? Link to comment Share on other sites More sharing options...
chaseincats Posted June 28, 2021 Author Share #143 Posted June 28, 2021 9 minutes ago, Captain Obvious said: This is a 78, right? With mostly stock EFI system? Yep. The only thing not stock about it is the tuning we all worked through on this thread. Link to comment Share on other sites More sharing options...
Captain Obvious Posted June 28, 2021 Share #144 Posted June 28, 2021 Gotcha. I'll think about it, and the meantime, let's hope someone else knows exactly what's going on! 1 Link to comment Share on other sites More sharing options...
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