EFIDynoTuning Forum

I'll finish sorting through my electrical gremlins before having another go at this. Thanks!

Sean

Yes, I did definitely se load drop below .16. I didn't try changing it to a higher load. Am I right to expect the CL/OL indicator switch to open loop when FN338 is functioning as expected?

Sean

OK, so I uploaded the changes to FN338, made sure patch was applied and the changes didn't seem to work for me.

I thought that in those decel ranges where load dropped to .16 or below that I would see Lambse pause, remain at 1.00 and OL indicated on the dashboard. None of those things happened. Any idea what i did wrong? I have some other electrical gremlins going on right now, so that may be playing a part.

Sean

Yea, I had the TFI module in mind but I have new Motorcraft spares on hand and swapping them out made no diff. When they've let me down in the past, they are usually reluctant to restart, but now it will restart readily, whether I bump-start it on the fly or even if I pull over and crank it with the key, seems to come right back to life. Never a problem at idle, but often only goes as far as clicking into second, then shuts down. It happens in other gears as well. I am leaning towards a failed ground or ignition switch connection. Most of my chassis gronds are through-bolts in chassis tube. While I doubt my little summer-only toy suffers much from corrosion, I can see a ground bolt vibrating loose or pehaps a ring connector cracked/broken.

I'm going to try to go through it tonight. Thanks for the ideas, keep 'em coming!!

Sean

Still happening. Worst ever on a really hot day, shuts off on the highway, comes back with key off/on and dropping the clutch. Happened 3-4 times in one day in various circumstances.

I lowered the relay block from behind the dash (no longer anywhere near my heater core) and they seemed surprisingly hot to the touch. My thoughts went to contact corrosion but all seems clean. I think it could be a irregular ground connection, as I thought that might make the relays run unnecessarily hot? I know a failing fuel pump can put excessive load on the relays too. Any chance this indicates a problem with the actual computer, since it is responsible for signalling the relays to change state??

Sean

Is this similar to your current FN338?
I opted to start with a lower number than yours mostly because its between what you ended up with and what Decipha recommended. I'll adjust from there.

Sean

Thank you. I really appreciate you taking time to share your experience.

If I understand the logic behind FN338, it doesn't keep you from going lean, just forces OL to prevent Lambse from ramping rich when its in decel state? And in your experience, this makes the transition from decel-stop (idle)-accel smoother?

I know what DFSO is but I haven't specifically enabled it to my knowledge. Is it possible its the default status of current version A9L2? I don't remember my car sounding like it does now under decel (like fuel has been shut off) using earlier A9L2 versions, but I could be wrong. It works well for me, since even a small amount of fuel available at decel makes my car pop like a squadron of Harleys due to the short exhaust config.

I'll make some changes to FN338 to se if I can improve the only real issue I've seen so far. Otherwise, I'm really happy with how its working.

Thanks again!

Sean

Thanks!

Have you seen any case of going rich on decel?

I saw a couple of your FN338 suggestions here but am struggling a little to understand how you settled on .17 as your sweet spot? Is that essentially "just over your decel value" and enough to keep it from struggling to find stoic when you come to a stop? Which rpm values did you change and which did you leave alone? Is everything above 3000 rpm just assigned a load of '1.0' ?

I'll try it once I begin to understand it more.

Sean

Paul,

Just to confirm, you never went back and adjusted FN1035 to allow for CL decel control? You only made changes to FN338, which is effectively an OL adjustment and its working fine for you? You haven't found a need to go back and 'dial in' FN1035?

Sean

OK, I guess I'm going to need to review what to do. Here's a pic of dashboard at 3000 rpm, closed throttle decel, .071 load. It does look a lot like my injectors almost shut off at decel.

Sean