New to the forum but use the Facebook group. Emu Black, Toyota 1ZZ, 310cc injectors, supercharged.
I’m having a weird issue, I’ve just upgraded to DBW from cable. Cable map drives very well and have had no issue with hundreds of miles. Now that I have i upgraded to DBW the VE table requires x3 the value it was with the cable throttle. VE increase confirmed by Lambda.
Used DBW calibration, all fine there, DBW opens as should. Nothing else has changed in the MAP.
I’ve also changed laptops.
Does anyone have any idea what’s going? I’m at my whits end.
Thanks for all that.
Was hoping to see something obvious, but all the injector and MAP sensor stuff looks the same.
Fuel pressure isn’t a logged parameter, did vacuum reference or something related to the FPR change between these 2 logs?
things that would affect VE like this, injector size (effective, so includes dead time and fuel pressure), map sensor (boost leaks, reference point) and IAT.
IAT is reading believable numbers (10*c different though, not enough to triple VE)
Fuel injector data is all the same, assuming the physical injectors are
Fuel pressure I can’t see, worth investigating
MAP sensor reads the same at no rpm and pretty similar at idle/slightly above idle. I don’t see the DBW log hitting boost just yet, most of the log looks like start up attempts.
Thank you for looking at this, really appreciate it. It’s great to have another pair of eyes, even just for a sanity check.
Everything physically is the same, apart from DBW haha. Yes, almost the whole log is trying to start apart from right at the end. I’ve been over the hoses, no leaks but will try a smoke test.
Injectors were cleaned and serviced in 2022.
I’m using the standard un monitored fuel pressure system. I actually emptied the tank using the fuel pump on Wednesday as the fuel was 4 months old and grabbing at straws, thought I’d put new fuel in. Flow was the same the last time I did it, but that’s nothing to go by haha
When I did get it running on the newest map it was running very badly, like it was intermittently/randomly missing. But pulling injector plugs and spark plugs did make it run worse, so couldn’t definitely pin point anything .
I’ll check fuel delivery, as you said, it’s the only unknown. Any tips or do I just need to put a sensor on it?
How do I check the vacuum reference?
Yeah a mechanical gauge or sensor into the ecu is even better. If you run the fuel pump with the engine off, base pressure is usually 44 psi or 300kpa. with the engine running and making vacuum it’ll be lower, in boost higher.
make sure the fuel filter isn’t clogged as well
thinking about it more; at steady idle, the injector pulse width is quite different but the lambda and map values are roughly the same. To me that says fueling flow issue
Sorry for the slow update. Thanks for taking the time to review and look at the maps/logs.
Ethanol is the same content. I’ve ordered a manual fuel pressure gauge for the time being. So I’m waiting for that to arrive. I’ll hopefully remove the in tank fuel filter this weekend to have a look.
Removed the spark plugs, they’re a little sooty/black but the electrodes are fine and I cleaned them up a little bit.
I changed back to the old 1ZZ injectors, changed the injector cc / dead time in the ecu and just tried to get it idling to rule out the injectors. Still the same.
I forgot to mention, I relocated the battery to the front of the car and tested all of the new/changed earth points. No voltage drop. Would it be worth chucking another earth in somewhere as could that affect spark plug and injector?