And I'm Back

After almost two months I finally got my ECU back from DIY. I put everything back together today and of course it doesn't seem to be working correctly. I swear I had this thing pretty dialed in before I sent the ECU off. So I have a couple quick questions. First is about the flex fuel sensor. I went ahead and added one since I had the time. It's plumbed into the return line and the signal wire is connected to pin M on the aux plug. But I kept getting a sensor code while running the car. So I decided to disable the sensor for now until I feel like troubleshooting it further. But as soon as I do that the idle starts to wander. Why would disabling the sensor cause the idle to wander?

Another question I had is about the warm up enrichment. I know this is dumb, but should the WUE should be lit up green when the engine is fully warmed up? I thought it would be green while the engine is in WUE and then once out of that the WUE light would go out. I was seeing green the entire time the engine was running and the coolant temp was up to 192 degrees I have it set to exit WUE at 160.

As a side note I'm not sure I totally trust my widebands. At times they seem to work fine, then suddenly they'll drift apart. I've noticed at times when sitting in a KOEO situation they don't always go full lean like I've seen other widebands do. I've reached out to Zeitronix to see what they say. To be honest I haven't been overly impressed with them so far.

I was going to attach a couple logs with the flex fuel sensor on and off, but apparently I messed something up and they're an mlq file instead of msq. And the site won't let me upload the mlq.

I finally got to drive my car again today. I learned the decel adjustment is really sensitive. I had it at 75% and every time I would lift my foot off the gas it would go full lean. That made shifting really interesting. It looked like I didn't know how to shift.

Does anyone have a good how to for setting the accel enrichment? I'm just not seeming to grasp that one. And I think it's the next one I need to do. When doing a quick stab say from 1/4 to 3/4 throttle the car hesitates for a second. I'm guessing that's the enrichment.

a91what said:

You will want to set that at 100% I can explain all the accel enrichments but it would take a very long time to type out.

Click to expand...

Even if it goes rich when I lift off the throttle? I'm guessing there's an adjustment somewhere else I'm missing.

It's been a few weeks, but I remember before when I would lift off the throttle, say like coasting in traffic on the freeway, it would go rich. Like into the 11's rich. But after a second or so it would come back to commanded A/F.

I'll have to double check when accelerating, but I remember it bouncing between rich and lean at first tip in then settling once a constant throttle position was reached. This includes taking off from a stop.

I'll check the enrichments tomorrow after work. I should have some free time.

Did some driving today and tried to keep an eye on things. I didn't think to datalog and I cleared my SD card. But I played around when I was on the freeway a little. When lifting off the throttle while cruising the A/F would go a couple points rich for a second or two then go full lean. If I coasted a bit it would go into Overrun. The Overrun is set at 20kpa and I think I see 21kpa unless I let it really coast. Such as going down hill or coming up on traffic without hitting the brakes.

I noticed when going from coasting back to part throttle there was a slight hesitation. The A/F would go lean then catch up to the commanded A/F. Small changes in throttle position only seem to move through the VE table. It takes moving the throttle from something like part throttle to 3/4 throttle shows the A/F going a couple points richer before returning to commanded A/F. Something I did notice is that no matter how fast or how much I moved the throttle the Accel indicator never came on.